bluuebunny/crossref_metadata_2025 huggingface dataset:
THE REVISED GLAUBER SCATTERING FORMULA WITHOUT ANGLE CONSTRAINT
Authors: QIAN XUAN-QING  ,   浙江大学物理系
Published: December 2020

The formula of the elastic scattering amplitude in the Glauber theory are re-derived. If we take rectanguler optic potential as zero order approximation and Woods-Saxon optical potential as exact potential, we find that the partial integral can be performed further in the original scattering amplitude formulas. Finally, We obtain the revised scattering amplitude without angle constraint.
A STUDY OF INTERFACES OF Co-TREATED γ-Fe2O3 THIN FILMS
Authors: DING YAO-GUO  , LIN ZHANG-DA  , QI SHANG-XUB  , WANG YIN-JUN  , QIAN JING-FANG  ,   (1)电子工业部杭州磁记录设备开发中心; (2)中国科学院物理研究所
Published: December 2020

The interfaces between CoO and Fe2O3 films have been studied, the results show that the simple CoO-γ-Fe2O3 interface has practically no effects on magnetic properties, and that the "complicated diffused interfaces" is anlikely to be the major factor in the enhancement of coercive force as previously believed. The Hc enhancement is likely to be a body effect caused by Co-doping rather than an effect of interfaces.
THE THEORY OF SUPERCONDUCTIVITY IN CeCu2Si2 AND UBe13 (Ⅰ)——MODEL, Tc AND ORDER PARAMETERS
Authors: XU JI-HAI  ,   山东大学物理系
Published: December 2020

The phenomena of the heavy-fermion superconductivity (HFS) of CeCu2Si2 and UBe13 were theoretically inveotigated by starting from the periodic Anderson lattice model and considering the interaction between the localized electrons and the localized lattice deformation. Throngh the calculations, we obtained a reasonable superconducting transition temperature Tc and showed that the parameter which describes the isotopic effect a<1/2, even equals to zero (in BCS theory a = 1/2). We showed that the isotopic effect is smaller in our theory than that in BCS theory, even there could exist no isotopic effect in our model, the result is in agreement with the experimental facts of HFS. In addition, the curves of the order parameters varing with the temperature and the density of state are given and the conclusion of f-electrons to be responsible for HFS can be obtained naturally.
NEUTRON DIFFRACTION STUDY OF Mn-Zn FERRITE CONTAINING TITANIUM
Authors: YANG JI-LIAN  , ZHANG BAI-SHENG  , XU ZHI-JIANG  , ZHOU HUI-MING  , JIN LAN  , YE CHUN-TANG  , YU MEI  , ZHOU ZENG-JUN  ,   (1)北京大学物理系; (2)中国原子能科学研究院
Published: December 2020

Mn-Zn ferrite was used extensively in a variety of communications. The frequency range is from several hundreds kHz to several MHz. But in the range of -40-80℃ the temperature coefficient of the permeability of the pure Mn-Zn ferrite is rather high which makes the working frequency to drift a little. This causes some trouble in use. In order to improve μ(T) curve, a variety of elements were taken to add to the Mn-Zn ferrite. It has been found out that the μ(T) curve is improved efficiently by adding only a small amount of titanium to the Mn-Zn ferrite. In order to understand the effect of titanium in the material, the neutron diffraction structure analysis of Mn-Zn ferrite containing titanium was carried out. The experimental results show that Ti atom occupies B site, Mn and Zn occupy A site preferentially. In addition the magnetic moment per molcule was also measured. The results are discussed preliminarily.
DETERMINATION OF SUPERCONDUCTING ENERGY GAP OF HEAVILY DOPED Re THIN FILMS BY ELECTRON TUNNELING
Authors: WANG RUI-LAN  , LI HONG-CHENG  , GUAN WEI-YAN  ,   中国科学院物理研究所
Published: December 2020

The superconducting energy gap of heavily doped Re thin films has been measured by electron tunneling of Re/Al2O3/Al junctions. We get △0= (1.04±0.02) meV, 2△0/KTc = 3.31±0.04. The △0 value is determined by the maximum conductance method. It is shown that the energy gap and the Tc of Re films increases many times by impurity, but Re remains a weakly coupled superconductor.
A CPA CALCULATION OF THE LMTO BAND STRUCTURE FOR TETRAHEDRAL BOND SEMICONDUCTOR ALLOYS
Authors: WANG REN-ZHI  , HUANG MEI-CHUN  ,   厦门大学物理系
Published: December 2020

A new approach for the CPA treatment of band structure of semiconductor alloys based on the LMTO-ASA-VCA method is suggested, in which no adjustable parameter is needed. In. order to construct a set of orthonormal sp-like hybrid orbitals from calcutated eigenstates and apply for CPA calculation, it is found that the following procedure is suitable: in the process of LMTO calculation and its VCA treatment, d states of atoms should be included in the matrix elememts, and d-band hybridization effect may be regarded as negligible for the secu-ler equation calculation. This method is illustrated with GaAlAs alloys. The results indicate that the CPA's calculation values of bowing parameters of bands and band-edges are quite reasonable.
THE CHEMISORPTION OF RARE EARTH ELEMENT ON Si(111) SURFACE
Authors: YE LING  , XIE XI-DE  ,   复旦大学物理系
Published: December 2020

The chemisorption of Ce, Sm and Yb on Si(lll) surface are studied by calculation with local density formalism (LDF) and discrete variational method (DVM). Two different clusters are used to simulate the top site and 3-fold site. The calculation is carried out self-con-sistently and the binding energy of the cluster is obtained. Optimum geometry is determined by minimizing the total energy. Charge transfer between rare earth atom and the silicon substrate, the energy of chemisorption and the density of states are discussed and compared with experimental results available.
A STUDY ON THE CARBURIZING AND BORONIZING BY LASER IRRADIATION AND THEIR STRENGTHENING MECHANISM
Authors: ZHENG KE-QUAN  , ZHANG SI-YU  ,   兰州大学物理系
Published: December 2020

In this paper, the experimental procedures are presented for carburizing and boronizing the 20 steel surface using a CW CO2 laser with an output power of 500-2000 W modulated CW. We also give a comprehensive analysis about the phase structure, the phase morphology, the distribution profile of the hardness and the resistance to abrassion of the sample after laser treatment. The experimental results indicate that the microstructure, the mechanical properties and the chemical composition in the surface layer of material will basically change. Furthermore, a preliminary discussion of the strengthening mechanism of the penetrating element by laser irradiation is also presented.
COMPRESSIBILITY OF LaBaCu2O5-δ SUPERCONDUCTOR
Authors: WANG YAO-JI  , HU JING-ZHU  , WANG WEN-KUI  ,   (1)中国高等科学技术中心(世界实验室)凝聚态和辐射物理分中心; (2)中国科学院物理研究所
Published: December 2020

In this paper, the experimental measurement and theoretical calculation of compressibility of La-Ba-Cu-O superconductor are presented, and its Bridgman's equation of stale is establised by using the experimental data.
NUMERICAL ANALYSIS FOR PELLET ABLATION (I)
Authors: TAO YUE-QUN  , QIU LI-JIAN  ,   中国科学院等离子体物理研究所
Published: December 2020

In this paper, we present a two-region numerical analysis method for pellet ablation in plasma where Te≤5keV, as well as the analytic expressions of ablation variables, which conform with the results of our nemerical analysis. Our results show that the major shield region is pellet suface vaporizing layer rather than ablatant cloud and that the flow of ablatant is supersonic when Te≤5keV.
LOW-HYBRID WAVE PROPAGATION AFFECTED BY A RANDOM MEDIUM LAYER
Authors: PAN CHUAN-HONG  , QIU XIAO-MING  ,   中国西南物理研究所
Published: December 2020

Making use of the stochastic model, we have studied the low-hybrid wave scattering by the density fluctuations in the edge-regions of Tokamak plasmas. The dispersion relation under consideration includes not only the E×B convective derivation term but also the electromagnetic correction term. The results show that the transmission coefficient decreases, whereas the reflection coefficient increases when the electromagnetic effect is taken into account.
EXPERIMENTAL OBSERVATION OF LASER DRIVEN HIGH PRESSURE SHOCK WAVES
Authors: GU YUAN  , NI YUAN-LONG  , WANG YONG-GANG  , MAO CHU-SHENG  , WU FENG-CHUN  , WU JIANG  , ZHU JIAN  , WAN BING-GEN  ,   工程物理研究院
Published: December 2020

This paper present the experimental records of the light emitting from heating lumines-cence at the back surface of aluminium foil or stepped targets, obtained by an optical ultra-fast speed streak camera. The target was irradiated by a focused high power laser beam with 500 J output energy in 1.2 ns FWHM pulse. The results showed that the degree of fllatness of the laser driven shock wave was obviously improved due to application of the special com-Lined lens. In these experiments the shock wave velocity in the step of aluminium target was obtained to be 17.6 m/ns, correspounding to shock wave pressure of 4.4 Mbar.
AN EXTENDED GENERATING FUNCTION TECHNIQUE FOR TREATING RANDOM WALKS ON COMPLEX NETWORKS
Authors: ZHENG DA-FANG  , SHEN SHUN-QING  , TAO RUI-BAO  ,   (1)复旦大学物理系; (2)中国高等科学技术中心(世界实验室)理论物理分中心
Published: December 2020

Introducing a structure factor matrix of random walk, we propose an extended generating function method to treat random walks on complex networks. As an illustration of this method, a random walk on an infinite dimer chain is considered.
THE EFFECT OF ANNEALING ON THE X-RAY DIFFRACTION OF W/C PERIODIC MULTILAYERS
Authors: JIANG XIAO-MING  , JIANG ZUI-MIN  , LIU WEN-HAN  , WU ZI-QIN  ,   中国科学技术大学基础物理中心
Published: December 2020

The behaviors of amorphous W/C periodic multilayers after annealing have been studied by precise low-angle X-ray diffraction. Afte refraction correction, the period of multilayers can be calculated more accurately using th low angle peaks. The period increases with increasing annealing temperatures. The intensities of 2nd and 3rd Bragg diffraction also increase with the annealing temperatures. These phenomena can be interpreted by the increase of thickness of the carbon layers.
MAXIMUM ENTROPY EVALUATION OF OVERLAPPED M?SSBAUER SPECLRA
Authors: XU ZU-XIONG  , MA RU-ZHANG  ,   北京科学技术大学金属物理教研室
Published: December 2020

A calculation scheme for the maximum entropy evaluation of the distribution of hyper-fine parameters from overlapped M?ssbauer spectra is proposed, which is subjected to the weak contraint condition. Maximum entropy evaluation is consistent with all given informations and has little correlation with the indefinite informations. The fitted distribution is characteristic of its positivity and bulk smoothness. Its local smoothness can be improved with relaxation of the contraint. The maximum entropy evaluation proved a more reliable method for fitting overlapped M?ssbauer spectra.
DEGENERATE GROUND STATE STEEPEST DESCENT PERTURBATION THEORY
Authors: WEN GEN-WANG  ,   湖南师范大学物理系
Published: December 2020

In this paper, an entire new approach for quantum mechanics calculation, the non-degenerate ground state steepest descent perturbation theory (SDPT) suggested by Cioslowski is developed and extended for dealing with degenerate ground state problem. Using sysmme-try adapted trial wave ket, the SDPT iteration for different sublevel is independent from each other and improves its eigen energy and wave function step by step. Therefore, the steepest descent perturbation theory can be used to calculate the low symmetry splitting of degenerate ground state and the correlation energy to arbitrary precison. Unlike other perturbation theory, this does not require either infinite summation overlstates or the solution of a set of differential equations, it could be expected wide adaptability in the calculation of energy level perturbation splitting of atoms, molecules and orther many body quantum system.
THE REFLECTION BEHAVIORS OF NONLINEAR OPTICAL INTERFACE BETWEEN GLASS AND LIQUID CRYSTAL
Authors: ZHANG HE-YI  , GUO PING  , HE XUE-HUA  ,   北京大学物理系
Published: December 2020

The reflection behavious of nonlinear optical interface between glass and liquid crystal were studied systematically. The reflection behaviours of such interface with isotropic liquid phase was studied by using a Q-switched ruby laser. The threshold intensity of transition from TIR (tolal internal reflection) to partial transmission for different incident angle were measured at T-Tc = 2.5℃. It agrees with the plane wave theory of Kaplan. The time resolved reflection of nonlinear interface was also measured and hysteresis loop of reflectivity was observed. The hysteresis loop of reflectivity can be attributed to the deorientation relaxation processes of liquid crystal molecules. The nonlinear optical interface between glass and ne-matic liquid crystal was also studied using an Ar+ laser. The transition from TIR to partial transmission was observed at the intensity 700 W/cm2. This transition can be attributed to thermal induced phase transition from nematic mesophase to isotropic liquid phase.
SIMPLIFIED ELASTIC DIPOLE MODEL OF NONLINEAR STRESS-INDUCED DIFFUSION OF INTERSTITIALS
Authors: SUN ZHONG-QI  , JIANG FANG-XING  ,   (1)北京科技大学物理系; (2)中国科学院金属研究所
Published: December 2020

A simplified model of one dimensional elastic dipole discrete lattice containing oscillating dislocations is proposed to study the nonlinear stress-induced diffusion of interstitials in the inhomogeneous stress field of dislocation and to set up a foundation for further numerical calculation in real crystals, consequently, to clarify the interaction of the external stress, the dislocations and the octahedral interstitials in bcc crystals and to explain S-K relaxation and the effect of dislocation on Snoek relaxation theoretically. The simulation computation shows that the nonlinear diffusion of interstitials induced by the dislocation stress field makes the interstitials form a Fermi-Dirac distrubution of defects and enhances Snoek effect, hence, a peak of Snoek effect of nonlinear diffusion appears at higher temperature than that of Snoek peak.
X RAY DOUBLE CRYSTAL DIFFRACTION STUDY OF (BiTm)3(FeGa)5O12 MAGNETIC GARNET FILMS GROWN BY LIQUID PHASE EPITAXY
Authors: TIAN LIANG-GUANG  , LIU XIANG-LIN  , XU SHUN-SHENG  , HAN XIAO-XI  ,   (1)上海交通大学应用物理系; (2)中国科学院上海冶金研究所
Published: December 2020

The investigation of (BiTm)3(FeGa)5O12 single crystal films grown by liquid phase epitaxy (LPE) at different temperatures is made by means of X-rays double crystal diffractometry and polarized optical microscopy. The study indicates that the temperature of LPE is very important. With the decrease of temperature, the crystal lattice parameter increases. The crystal film includes two layers of different crystal latticeparameter or orientation. When the crystal lattice misfit ((as-af)/(as)) between the subst-rate and the film is greater than 10-3, the film will crack.
POLARIZABILITIES OF HIGH RYDBERG ALKALI ATOMS
Authors: HE XING-HONG  , LI BAI-WEN  , ZHANG CHENG-XIU  ,   中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室
Published: December 2020

A potential model for atoms is employed to calculate the scalar and tensor polarizabilities of Rydberg states (15≤n≤55) of Na, K, Rb and Cs. The results are very close to the experimental values. The scaling relations of the polarizabilities a = An*7 + Bn*6 are also established, and the results obtained from them also agree with experimental data satisfatorily.
GREEN'S FUNCTION THEORY OF PHASE TRANSITIONS IN HYDROGEN-BOND FERROELECTRICS (Ⅰ)
Authors: WANG CHUN-LEI  , ZHANG JIN-BO  , QIN ZI-KAI  , D. L. LIN  ,   (1)美国纽约州立大学Buffalo分校物理学和天文学系; (2)山东大学物理系
Published: December 2020

In this paper, our study on the hydrogen-bond ferroelectrics with Green's function method is reviewed. First we show how to apply the bose-type Green's function method properly to the pseudo-spin model. Then we introduce the four-body interaction in the pseudo-spin model in order to treat the first order phase transition. Analysing the equation describing the phase transition process, we propose a new condition to determine the nature of the system. Also we obtain the critical value of the model parameters and the phase diagram. Our conclusion is that the first order phase transition is induced by the fourbody interaction.
CALCULATION ON SCATTERING INTENSITIES OF HYPER-RAMAN EFFECT
Authors: XIA HAI-RUI  ,   山东大学物理系
Published: December 2020

In this paper, hyper-Raman scattering intensities are calculated based on the quantum theory of radiation. From the intensity formulae, we can conclude directly that all Raman material that has vibration infra-red activity must have vibration hyper-Raman activity simultaneously. Because probability of dipole transition only contributes to anti-Stokes hyper-Raman scattering intensity, the intensity formulae of the anti-Stokes and Stokes are asymmetric, and the former consists of richer spectra than the latter. For the frequency shift of low wave number, the two intensities are almost identical even at room temperature. Finally, the resonance hyper-Raman scattering is also discussed.
EQUILIBRIUM AND STABILITIES OF A SELF-CONFINED PLASMA BALL
Authors: WU HAN-MING  ,   中国科学院力学研究所
Published: December 2020

Based on MHD concepts, we explain and prove that a self-confined plasma ball imbeded in a constant pressure p0 can be in equilibrium as well as stable states. Besides, it is found that the equilibrium states can not be force-free configurations. The conclusion that the average pressure inside the plasmaball is less than p0 is drawn from the calculation. Furthermore, we point out that the condition for the stability against local perturbations is satisfied, even magnetic shear is weaker in the plasmaball, which implies that the self-confined plasma ball can be expected to have some favourable MHD stability characteristics.
APPLICATION OF X-RAY PROFILE FOURIER ANALYSIS TO PREDICT MECHANICAL PROPERTIES OF ALLOYS
Authors: TENG FENG-EN  , CUI XIANG-XU  ,   吉林大学材料科学研究所
Published: December 2020

The defect configuration relates directly to the mechanical behaviour of structural materials. Especially, dislocation substructure, DSS, is one of the most important configurations. In this paper, a realistic x-ray diffraction profile analysis of DSS, developed by Wang, is reviewed and illustrated. Its application to predicting quantitatively mechanical properties is made.
TARGET ATOM EXCITATIONS IN COLLISIONS OF He+ AND He2+ WITH Li AT q×(20——150) keV
Authors: YU DE-HONG  , LIU JIA-RUI  , LEI ZI-MING  , YANG FENG  , PAN GUANG-YAN  , WANG DUAN-WEI  , SUN XIANG  ,   (1)中国科学院物理研究所; (2)中国科学院物理研究所,北京师范大学物理系; (3)中国科学院物理研究所,曲阜师范大学激光研究所
Published: December 2020

Target atom excitations in collisions of He+ and He2+ with Li have been studied by optical measurement in the energy range q×(20-150) keV. We have measured Lil 670.8 nm (2p→2s), Lil 610.4 nm (3d→2p), Lil 460.3 nm (4d→2p) and Lil 812.6 nm (3s→2p) emission lines by using an OMA system. The emission cross sections of the observed lines and corresponding Li(2p) excitation cross sections have been calculated. For He+ +Li collision system, Lil 670.8 nm emission cross sections linked well with the results of Aumayr et al. at the low energy points. Our Lil 670.8 nm emission cross sections of He2++Li collision system agrees well with both the theory of Ermolaev er al. and the experimental results of Kadota et al. within the experimental errors.
ENERGY TRANSFER OF Eu3+ EXCITED STATES IN SBN CRYSTAL
Authors: ZHAO XIAO-HONG  , CHEN TING  , ZHANG GUI-LAN  , CHEN WEN-JU  , SUN DA-LIANG  , SONG YONG-YUAN  , CHEN HUAN-CHU  ,   (1)南开大学物理系; (2)南开大学物理系,北京邮电学院基础部; (3)山东大学晶体材料研究所
Published: December 2020

Eu3+ ions at different crystal-field sites in SBN crystal are selectively pumped. From the time-resolved fluorescence spectra of 5D0→7F1, the energy transfer rates between ions in non-equivalent sites are evaluated. The dependence of fluorescence peak-frequency on the excitation wavenumber indicates the continuous distortion of local crystal field.
COHERENT STATES, SQUEEZED FLUCTUATION, AND RECOMBINATION RADIATION OF ELETRON-HOLE PAIRS IN SEMICONDUCTOR
Authors: HUANG HONG-BIN  ,   东南大学物理化学系
Published: December 2020

The production of Bose approximation coherent states and SU(2) coherent states of electron-hole pairs in semiconductor generated by coherent light excitation are discussed. Squeezed fluctuation and recombination radiation of electron-hole pairs are studied for these two cases. The second order coherence and distribution functions of electron-hole pairs are given. It is shown that the Bose approximation corresponds to the contraction of group SU(2) to the harmonic-oscillator group.
BRST QUANTIZATION AND QUASI-FREE FIELD THEORY FOR THE KRICHEVER-NOVIKOV STRING
Authors: XU KAI-WEN  , GUO HAN-YING  ,   (1)浙江大学物理系; (2)中国科学院理论物理研究所
Published: December 2020

Based on the BRST quantization, a quasi-free field theory for the Krichever-Novikov string on arbitrary genus Riemann surface has been given in analog to the Siegel approach to free closed string field theory. A non-purtubative formalism has also been suggested.
A TEM STUDY OF CRYSTALLIZATION OF AMORPHOUS Ni-Zr ALLOY (Ⅱ)——TRANSITION AREA FORMED DURING CRYSTALLIZATION OF Ni-33at%Zr
Authors: HEI ZU-KUN  , GUO YONG-XIANG  ,   (1)大连海运学院; (2)上海交通大学
Published: December 2020

A transition area, which appears in the transformation from a metastable phase to a stable one during the crystallization of Ni-33at% Zr amorphous alloy, had been investigated by means of TEM. From the lattice image, it can be seen that the unstable phase corresponds to fringes with broad spacing or alternate between broad and narrow spacings, the stable phase corresponds to a single kind of fringes with narrow spacing, but for the transition area the arrangement of fringes with broad or narrow spacing is random and shows no regularity. In addition, for this area, the electron diffraction pattern exhibits no translation summetry. The pattern can be seen as one of the transformation process between the unstable phase and the stable one. Distributions of the diffraction intensities of the transition area are simulated by means of models with identical atomic planes but various packing spacings, the result agrees with the actual intensity distribution very well.
SUM-FREQUENCY GENERATION OF 367.3-379.4 nm IN β-BaB2O4 CRYSTAL
Authors: LU SHI-PING  , YUAN YI-QIAN  , YANG LI-SHU  ,   中国科学院安徽光学精密机械研究所,合肥,230031
Published: December 2020

The continuously tunable sum-frequency generation of 367.3-379.4 nm of the Rh·6G dye laser and the Q-YAG laser was obtained in β-BaB2O4 crystal. The sum-frequency output energy is about 2 mJ, and the conversion efficiency is about 12%. The influence of the non-collinear propagation on the output energy and conversion efficiency of turn-frequency generation are also discussed.
A STUDY ON THE TEMPERATURE DISTRIBUTION IN HIGH-PRESSURE SODIUM ARC
Authors: WU MEI-PING  , ZHOU TAI-MING  , CAI ZU-QUAN  ,   (1)复旦大学电光源研究所,上海,200433; (2)复旦大学电光源研究所,上海,200433,中国纺织大学物理教研室
Published: December 2020

A method of calculating the temperature profile of high-pressure sodium electric arcs using the diffusion approximation for the radiation flux density is described. Account is taken of energy transfer due to thermal conduction, emission and absorption of radiation. The method has been applied to calculate the temperature profile for a sodium vapor pressure of 250 Torr and the calculated temperature distribution is compared with the result of experimental measurement.
IN SITU OBSERVATION OF FERRO-ELASTIC TRANSITION IN BNN CRYSTAL
Authors: XU XIU-YING  , ZHANG XING-KUI  , XU ZI-RAN  ,   南京大学物理系固体物理研究所,南京,210008
Published: December 2020

In situ observation of the ferro-elastic transition in BNN crystal is carried out with the convergent polarized interference pattern, it reveals that the crystal transforms from bioaxies to uniaxies in heating with an inflection point Ts at 250±20℃. The transition is of the continuous and diffuse type. A large hysteresis about 20-30℃ is show by the fact that heating and cooling curves are distinct above 210℃. The twins (ferro-elastic domain) disappear and reappear in accordance with the time of phase transition. The density of the twins influences the inflection point Ts of the phase transition and the degree of hysteresis leading to decrease in Ts and increase in the hysteresis. The defects and microscopic compositional inhomogeneities are the main cause for the diffuse of the phase transition.
PREPARATION AND PRELIMINARY EXPERIMENT STUDIES OF INTERCALATION COMPOUND LiV2O4
Authors: LIU ZAI-HAI  , ZHANG WEN-BIN  , WANG GANG  ,   (1)北京师范学院物理系,北京,100037; (2)首都钢铁公司职工大学,北京,100041; (3)中国科学院物理研究所,北京,100080
Published: December 2020

LiV2O4, with spinel structure, is prepared under vacuum by heat-treatment of Li0.5VO2 obtained by chemical extraction of 0.5 lithium from the layered compound LiVO2. Similar treatment of Li0.465VO2 results in a cation-deficient spinel Li0.93V2O4. X-ray powder diffraction data show that LiV2O4 is only different slightly from Li0.93V2O4 The preliminary test of the experimental cell by using LiV2O4 as positive electrode is made.
A STUDY ON THE METASTABLE THERMAL DEFECTS IN REACTIVELY SPUTTERED a-SiGe:H FILMS
Authors: WANG YIN-YUE  , ZHANG FANG-QING  , CHEN GUANG-HUA  ,   兰州大学物理系,兰州,730001
Published: December 2020

Thermally induced metastable defects in reactive sputtered a-SiGe:H films are studied by conductivity σ(T) and heterojunction capacitance-voltage (C-V) measure ments.
THE SITE-BOND PERCOLATION OF PHASE TRANSITION IN DILUTED MAGNETIC SYSTEM
Authors: ZHENG MAO-SHENG  , LIU YUN-PENG  , LUO EN-ZE  ,   西安电子科技大学物理系,西安,710071
Published: December 2020

The phase boundary relationships for site-bond percolation and diluted magnetic system transition are established by generalizing the universal relationships of pure site and pure bond percolations. As compared with other methods used to treat the problems of site-bond percolation and diluted magnetic system transition, it can be found that the relationships given in the present paper has some advantages, such as, simplicity, convenient to use, and accuracy. Especially, it has a clearer physical meaning.
A STUDY ON ELECTRICAL RESISTIVITY OF RF SPUTTERING Pd FILMS
Authors: SHI YI-SHENG  , ZHAO TE-XIU  , LIU HONG-TU  , WANG XIAO-PING  ,   中国科学技术大学物理系,合肥,230026
Published: December 2020

In this paper, we report the study of the dependence of electrical resistivities of sputtering Pd films on their thicknesses and electrical resistivities of sputtering Pd films under different sputtering power. The results show that there is a small diversity between the latter theory of "size effects" and results of the thickness dependence of electrical resistivity. This diversity is due to effect of temperatures of the substrates. It shows that there is optimization during depositing on glass, and sputtering power would af fecth the electrical resistivity. After discussing the problem of substrate temperatures, we obtained a quantitative formula for the substrate temperature dependence of electrical resistivity.
MAGNETIC PROPERTIES AND INVAR EFFECT OF a-TM-Zr ALLOYS
Authors: HUANG ZHI-GAO  , WAN JIAN-PIN  ,   福建师范大学物理系,福州,350007
Published: December 2020

In this paper, the M?ssbauer spectra of a-Fe90-xCoxZr10(x = 0,4,10,20) and Fe90-yCryZr10(y= 4,7,13,16) alloys were studied at 77K. The results indicate that two different magnetic states exist in a-Fe-(Co, Cr)-Zr alloys, the dependence of hyperfine parameters on the average outer electron concentration a of the 3d TM atom show anomalies in the vicinity of a = 8, which implies the invar effect of a-Fe90Zr10 and a-Fe-(Co, Cr)-Zr with low Ca(Cr). The reduced temperature dependence of the reduced hyperfine field reveal the existence of amorphous ferromagnetism in a-Fe90-xCoxZr10(x = 10, 20) and the spin-grass-like behavior in a-Fe90-xCoxZr10(x = 0,4). A new magnetic structure model are suggested and discussed.
MEASUREMENT OF ELECTRON DENSITY BY MEANS OF THE FLUORESCENCE OF A THERMAL LITHIUM BEAM
Authors: YU YI-JUN  ,   中国科学院安徽光学精密机械研究所,合肥,230031
Published: December 2020

We use a new method to measure electron density in the boundary layer of plasma, which is based on the fluorescence resulting from the collision of electron and lithium atom. We observe the fluorescence signal of lithium atom at 6708?(2P0-2S) with both CCD-camera and S20 photo-multipliers simultaneously. From the received radial intensity distribution, we deduce the radial distribution of electron density.
ELECTRONIC STRUCTURE AND SUPERCONDUCTIVITY OF Nd-(Ce)-Cu-O
Authors: CHEN SHI-MIN  , SUN JI-XIN  ,   南京大学物理系,南京,210008
Published: December 2020

The electronic structure of Nd2CuO4 has been calculated self-consistently by WLAPW method. Because of the interactions (hybridization) between the electrons in the localized Nd 4f bands and those in the conduction band, a≈4 states/eV. cell DOS peak of the Cu-0(1) dp a band is presented at 0.18 eV above the Fermi energy, which may be used as a possible interpretation of the superconducting transition in Nd2-xCexCuO4 with x.
STUDY OF INTERSUBBAND OPTICAL TRANSITIONS IN GaAs/AlxGa1-xAs SUPERLATTICES
Authors: PAN SHAO-HUA  , CHEN ZHENG-HAO  , FENG SI-MIN  , CUI DA-FU  , YANG GUO-ZHEN  ,   (1)中国高等科学技术中心(世界实验室); (2)中国科学院物理研究所,北京,100080
Published: December 2020

In this article, we investigate the properties (transition frequency, bandwidth, and dipole transition moment) of intersubband optical transitions by using the new general form of the Kronig-Penney model developed recently. The theoretical results are in good agreement with our experimental measurements of infrared absorption in a GaAs/AlxGa1-xAs superlattice.
A STUDY OF THE INFLUENCE OF A SURFACE BARRIER OF SOLIDS ON ION REFLECTION BY BIPARTITION MODEL
Authors: LUO ZHENG-MING  ,   四川大学原子核科学技术研究所,成都,610064,中国高等科学技术中心
Published: December 2020

It is very important to evaluate the reflection of low energy ion from a surface of solid for understanding the interaction between plasma and the first wall in a fusion reactor. When ion energy is lower than 1 keV, the influence of the surface barrier of solids on ion reflection gradually becomes important. In the present paper, the influence of the surface barrier of soids on ion reflection has been evaluated by extending the bipartition model for light ion transport to the case of the boundary with a rectangular surface barrier. Our computational results have shown that surface barrier can remarkably reduce the ion reflection coefficient, when ion energy decreases down to less than 10 times surface potential energy of the solids.
IMPURITY EFFECTS ON CHEMISORPTION OF COMPOSITE CATALYSTS
Authors: ZHANG TAO  , KANG MIN-CHENG  , LU WEN-CHANG  ,   河南师范大学物理系,新乡,453002
Published: December 2020

The chemisorption energy of hydrogen on ZnO/Ni composite substrate is investigated using the Green function method and the complex-energy-plane integration approach. The tight-binding approximation is employed to model the semiconductor ZnO by a finite chain of alternating s- and p-orbitals, while the semi-infinite metal Ni is represented by a linear chain of d-orbitals. The impurity effect on the chemisorption energy is evaluated. The calculation shows that: (1) the chemisorption energy is a monotonously decreasing function of the ZnO thickness; (2) the presence of impurities Cu and Pt (Co and W) can weaken (strengthen) the chemisorption process and (3) the impurity effects are most significant when the impurity is closest to the nickel surface.
DOUBLE WAVE FUNCTION APPROACHES TO SYSTEMS OF PLANAR AND SPHERICAL ROTATOR
Authors: LIU QUAN-HUI  , WANG FA-BO  ,   (1)湖南大学应用物理系,长沙,410082; (2)湖南师范大学物理系,长沙,410081
Published: December 2020

In this paper, we give the double wave function theory for systems of planar and spherical rotator, obtain rigorously the classical mechanical equations of motion for these two systems study the related problems in the ordinary quantum theory for these sfstems.
STEADY-STATE RESONANCE FLUORESCENCE FROM A THREE-LEVEL ATOM IN A SQUEEZED VACUUM
Authors: YANG GUO-JIAN  , HUANG ZU-QIA  , HU GANG  ,   (1)北京师范大学低能核物理研究所,北京,100875; (2)北京师范大学物理系,北京,100875
Published: December 2020

Steady-state resonance fluorescence spectrum from a three-level atom driven coherently by two intense optical fields and damped by a squeezed vacuum is obtained, which shows the dependence of the spectrum strongly on the squeezing of the vacuum field and the phase difference between the squeezed component of the vacuum field and the driven fields.
EXPONENTIAL VARIATION METHOD FOR CHARGE EXCHANGE IN H++ H COLLISIONS
Authors: LIU QIANG  , WANG JIAN-ZHONG  , XU XIANG-DONG  , CHEN XUE-JUN  ,   (1)清华大学现代应用物理系,北京,100084; (2)中国高等科学技术中心(世界实验室)
Published: December 2020

The exponential variation method is applied to the charge exchange in H++ H collisions in the present paper. The angular distributions have been calculated practically for two incident energies, 60 and 125 keV. The present results show that the obvious improvement with respect to BIB approximation can be obtained by the exponential variation method.
MAGNETIC PROPERTIES OF A YBCO CRYSTAL PREPARED BY MELT-TEXTURED GROWTH METHOD
Authors: WEI CHONG-DE  , LIU ZUN-XIAO  , LAN JIAN  , SUN YUN-XI  , GAN ZI-ZHAO  , REN HONG-TAO  , XIAO LINO  , HE QING  ,   (1)北京大学物理系,北京,100871; (2)北京有色金属研究总院,北京,100088
Published: December 2020

The magnetization curves of YBCO crystal prepared by melt-textured growth method were measured from 1.5K to 89K. Flux jumps were observed for H‖ c at 1.5K, 7K and 10K. Peak effects were observed for H‖ c in the temperature range of 15-83K. The anisotropies of magnetization curves and magnetic critical current are analysed in detail. The properties of connection between grains and the pinning mechanism are discussed.
Z ECHO NMR POWDER SPECTRUM OF THREE-LEVEL SYSTEMS
Authors: LI GENG-YING  , WU XUE-WEN  ,   华东师范大学分析测试中心,上海,200062
Published: December 2020

A Z echo NMR pulse sequence is proposed for using in measurement of pure dipole or quadrupole spectrum. The Z echo NMR powder lineshape is not only independent of chemical shielding anisotropy but also, under strong radio-frequency field condition, independent of rf field inhomogeneity. This method is superior obviously to nutation NMR technique. The conclusions were analyzed theoretically and confirmed by experimental results.
MEAN FREE PATH OF PARTICLES IN FHP HYDRODYNAMICAL MODELS
Authors: LIU MU-REN  , KONG LING-JIANG  , JIANG FENG  ,   广西师范大学物理系,桂林,541001
Published: December 2020

The mean free path of the FHP hydrodynamical models is calculated. The calculations show that the mean free path is approximate to a constant after more than 60 collisions and is a minimum, which is corresponding to the maximum of Reynolds' number, when particle density is 0.25. In addition, the difference between the FHP models and the molecular dynamic models is showed clearly.
L-SUBSHELL IONIZATION OF Tb, Er AND Lu BY 0.2-1.2 MeV INCIDENT PROTONS
Authors: MA SHU-XUN  , YANG KUN-SHAN  , ZHANG HUA-LIN  , CHEN XI-MENG  , LIU ZHAO-YUAN  ,   兰州大学现代物理系,兰州,730001
Published: December 2020

Rare earth elements Tb, Er and Lu were bombarded by protons with energies of 0.2-1.2 MeV, L-subshell ionization cross sections were obtained. Experimental ionization cross sections were compared with the predictions of the ECPSSR theory.
A STUDY OF ELECTRONIC CHARACTERIZATION IN MOLECULAR BEAM EPITAXIALLY GROWN GaAs ON Si
Authors: ZHOU JIE  , LU LI-WU  , HAN ZHI-YONG  , LIANG JI-BEN  ,   (1)半导体超晶格国家实验室中国科学院半导体研究所,北京,100083; (2)中国科学院半导体研究所,北京,100083
Published: December 2020

The electronic characteristics of GaAs grown on Si by molecular beam epitaxy(MBE) has been examined by studying the diode characteristics and deep level transient spectroscopy (DLTS) of Schottky barriers. l-V characteristics of samples show the existence large leakage current. Post-growth rapid thermal annealing(RTA)has been found to be able to significantly improve the diode behaviour. The reverse current in the as-grown material shows a very weak temperature dependence, indicating that its origin is not thermoionic emission or generation-recombination currents. We think that a large part of this current is due to defect-assisted tunneling, which is reduced by RTA. DLTS spectra show that Ec-0.41eV and Ec-0.57eV electron traps are observable. The former is located near the GaAs-Si interface probably, the latter relates to the well-known electron trap M5 typical of MBE GaAs.
ADSORPTION OF ALKALI METAL ON GaAs(110) SURFACE
Authors: QIAO HAO  , ZHANG KAI-MING  ,   复旦大学物理系,上海,200433
Published: December 2020

In the present work, adsorptions of Li,Na,K,Cs on GaAs(llO) surface are studied. Both the ideal and the relaxed surface are considered. The calculations are carried out by using the charge self-consistent EHT method with a cluster model. The results indicate that the surface atoms tend to the ideal configuration after adsorption, and the alkali atom lies at the symmetric plane perpendicular to the surface and crossing the surface Ga atoms along the [001] direction. The Fermilevel is located about 0.7eV above the valence band maximum, which is contributed by the interaction between the surface Ga atoms and the alkali atom, while in the valence band, the alkali atom is bonded mostly with the surface As atoms.
ON THE RELATION BETWEEN THE IN-PLANE ANISOTROPY AND THE TECHNICAL MAGNETIC PROPERTIES OF AS-PREPARED AMORPHOUS ALLOY RIBBONS
Authors: HE KAI-YUAN  , XIONG XIANG-YUAN  ,   东北工学院材料科学与工程系,沈阳,110006
Published: December 2020

The in-plane magnetic anisotropy constants of Fe40Ni40P12B8 and (Fe0.1CO0.5Ni0.4)78Si6B16 amorphous alloy ribbons in the as-quenched and annealed state have been measured with the torque magnetometer and the work of magnetization methods. The results show that the main part of the anisotropy constant measured by the torque magnetometer method for the as-quenched samples does not change after annealing and this part of anisotropy almost produces no influence on the magnetization curve.
A SIMULATION OF DIFFUSION OF CHARGED PARTICLES IN A SPACE CORRELATION TURBULENT ELECTRIC FIELD
Authors: HU XI-WEI  ,   中国科学技术大学近代物理系,合肥,230026
Published: December 2020

A Monte-Carlo method is used to simulate the turbulent electrostatic field with space correlation. Evolution processes of relative and absolute diffusions of charged particles in this turbulent field can be obtained by integrating equations of motion of the particles. Simulation results agree well with the analytic theories both qualitatively and semi-quantitatively.
A STUDY ON REACTION KINETICS OF THE RADICALS PRODUCED IN THE LASER-INDUCED SILANE PLASMA
Authors: FU GUANG-SHENG  , WANG JIN-GUO  , LI XIAO-WEI  , HAN LI  , Lü FU-RUN  ,   (1)河北大学物理系,保定,071002; (2)河北大学物理系,保定,071002;河北农业大学基础部,保定,071001
Published: December 2020

The reaction kinetic processes of species produced in a pulsed TEA CO2 laser induced si-lane plasma were studied with the time-resolved OES. It is showed that the time position of main peaks for different fragments' charactristic lines are appreciably different. The reaction kinetic processes are discussed based on the results. By comparing the time evolution of the lines of the fragments and considering the other results of OES, We infer that the final reaction channel of the laser-induced silane plasma is a Si producing channel.
INFRARED SPECTRA OF Pr-DOPED Y-Ba-Cu-O SYSTEM SUPERCONDUCTORS
Authors: ZENG WEN-SHENG  , YANG XIAO-MING  , LI ZEBNG-FA  , ZHANG GUANG-YIN  , SONG DE-YING  , YAN SHAO-LIN  ,   (1)南开大学电子科学系,天津300071; (2)南开大学化学系,天津300071; (3)南开大学物理系,天津300071; (4)中山大学物理系,广州510275;南开大学物理系,天津300071
Published: December 2020

The result of studies on the infrared spectra of PrxY1-xBa2Cu3O7-δ system superconductors are reported. It is found that the direct result of increasing the Pr content is that most reflectance features become stronger in the whole energy range (including midle infrared and far infrared). The fingureprint phonon of Y atom at 190cm-1 does not shift when the content of Pr changes. This confirm, that the valence of Pr in this system is greater than +3, which is the valence value of Y in YBa2Cu3O7-δ, and should be between +3 and +4. We also found that, after making the assignment of all phonons, the vibration modes whose strengths increase when the content of Pr increases must be the vibration modes in the CuO2 plane or parallel to the CuO2 plane. This case is much similar to the situ ation of decreasing oxygen content in the YBa2Cu3O7-δ system. It is showed that these vibrations in the CuO2 plane are important for the high-Tc superconduccivity.
EMISSION SPECTRUM OF GAS PHASE CCl2
Authors: CHEN YANG  , LU QING-ZHENG  , MA XING-XIAO  , GUI ZHI-FENG  , ZHAO XIAN-ZHANG  , LU TONG-XING  ,   (1)安徽师范大学物理系,芜湖241000; (2)中国科学技术大学近代化学系,合肥230026
Published: December 2020

In DC discharge of CCl2 vapor, the emission spectrum from 520 to 630 nm has been observed and identified as the A→X transition of CC12 radical. About 400 bands were assigned to (v1′,v2′,0)→(v1″,v2″,0) progressions of 35Cl-C-35Cl and 35Cl-C-37Cl, and tabulated to Deslandres tables. Spectral analysis gave out the vibrational frequencies v1, v2 and their isotopic shifts in which the data of gas-phase CCl2 in ground state were not found yet in literatures.
A KINETICS MODEL AND STUDY OF CuBr PULSED LASERS
Authors: CHENG CHENG  , SUN WEI  ,   (1)杭州师范学院物理系,杭州310012; (2)浙江大学物理系,杭州310027
Published: December 2020

A kinetics model including five levels is presented according to the emission spectrum of Cu atom observed from a CuBr laser plasma. The numerically calculated laser power, peak time and weveform, by employing the experimental data of electron temperature and density, well conform to our measurement. At fixed input power, it is also shown that to change the difusion coefficient of the buffer gas will change the average temperature of the gas or the initial density of Cu atom, therefore, change the laser power as well.
A STUDY ON BOND STRUCTURE OF NANOMETER-SIZED AMORPHOUS SILICON NITRIDE SOLIDS IN TERMS OF X-RAY RADIAL DISTRIBUTION FUNCTIONS
Authors: CAI SHU-ZHI  , MU JI-MEI  , ZHANG LI-DE  , CHENG BEN-PEI  ,   (1)中国科学技术大学材料科学与工程系,合肥230026; (2)中国科学院固体物理研究所,合肥230031
Published: December 2020

The microstructure and bond character of the nanometer-sized amorphous silicon nitride solid (NANO-SNS), heat-treated in the temperature range of 25°-1000℃, were studied in terms of X-ray radial distribution functions. It was observed that the interfaces with a large volume fraction were not the "gas-like" structure but the short-range order structure, which is different from that inside the amorphous nanoparticle. Both Si-N bond length and coordination numbers of the first nearest neighbours(CN) in interfaces are less than that in traditional Si3N4 and there exist a large number of Si dangling and unsat-urated bonds. NANO-SNS has an nonty-pical covalent structure that contains lots of unsaturated and dangling bonds. This bond structure is different from the saturated covalent bond structure of traditional Si3N4.Due to the unsaturated character of the bond coordination numbers, the molecular form of NANO-SNS should be written as Si3-xN4-y. The appearence of strong polarity of NANO-SNS is closely related to unsaturated and dangling bonds.
THEORETICAL CALCULATION OF QUANTUM EFFICIENCY FOR FIELD-ASSISTED InP/InGaAsP SEMICONDUCTOR PHOTOCATHODES
Authors: LI JIN-MIN  , GUO LI-HUI  , HOU XUN  ,   (1)中国科学院西安光学精密机械研究所,西安710068; (2)中国科学院西安光学精密机械研究所,西安710068;现在中国科学院半导体研究所工作
Published: December 2020

The factors determining quantum efficiency of field-assisted InP/InGaAsP semiconductor photocathodes have been analysed in detail in the paper. The transmission process of electrons in the absorption layer and transferred-electron process in the emission layer as well as the escape probability of electrons in the surface of emission layer have been calculated quantitatively on the basis of continuity equations and tunnelling effect of quantum mechanics. The curves of quantum efficiency versus wavelength for various biases have been obtained. The results show that the quantum efficiency of semiconductor photocathode in the range 0.9-1.25μm can be risen two orders of magnitude or more under a proper bias. It is helpful in designing the structure of semiconductor photocathodes and choose the optimum conditions of operation.
MANY-BODY PERTURBATION THEORETICAL CALCU-LATION WITH FINITE BASIS SETS CONSTRUCTED FROM B SPLINES
Authors: XI JIN-HUA  , WU LI-JIN  ,   中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室,武汉430071
Published: December 2020

In this article, the B spline technique is employeed to construct finite basis sets for the radial HF equation. MBPT calculation is performed on the radial hyperfine interaction parameters of 11B ground state with such basis sets. The results for the megnetic dipole parametrs are al = 0.7776850, asd = 0.8462827 and asd/al = 1.0882, which is in good agreement with experimental values of 0.778 (2), 0.844 (3) and 1.085. The electric quadrupole parameter is aq = 0.7462691,showing a discrepancy of 6% from the experiment.
THEORETICAL ANALYSIS OF PHOTOACOUSTIC RAMAN SPECTROSCOPY
Authors: TANG ZHI-LIE  , SI TU DA  , LIANG RUI-SHENG  ,   (1)华南师范大学物理系,广州510631; (2)华南师范大学物理系,广州510631;云南教育学院物理系,昆明650031
Published: December 2020

The theoretical analysis of photoacoustic Raman spectroscopy (PARS) is prese-nted The general expressions of PARS signal in solid and liquid samples are derived and the theoretical estimation is given.
A LEED STUDY OF ATOMIC STRUCTURE ON Si(113) SURFACE
Authors: XING YI-RONG  , WU JI-AN  , ZHANG JING-WNG  , LIU CHI-ZI  , WANG CHANG-HENG  ,   (1)中国科学院半导体研究所,北京100083; (2)中国科学院半导体研究所,北京100083;中国科学院表面物理国家重点实验室,北京100080; (3)中国科学院表面物理国家重点实验室,北京100080; (4)中国科学院物理研究所,北京100080
Published: December 2020

By using low energy electron diffraction (LEED), the atomic structures on Si (113) surfaces were studied. These surfaces were prepared by both ion bombardment followed by annealing (IBA) and epitaxial growth. When tbeannealing temperature was higher than 750℃, a 1 × 1 unreconstructed structure was observed above 600℃ for both kinds of surfaces. Cooling the specimen from the annealing temperature at a rate of 5℃/min, we found that the surface structure converted from the 1×1 through 3×1 (beteen 600℃ and 400℃) to the final 3×2 superstructure. A lower annealing temperature (～600℃) results in a 3×1 superstructure only. Both 3×2 and 3×1 structures are very stable at room temperature. The influence of surface impurities on the Si(113) surface structure was discussed. The clear 3×1 superstructure was also appeared on the initial Si(113) surface of about 20 monolayers thick epitaxial film grown by evaporation method.
CALCULATION OF THE MEAN PROJECT RANGE OF MeV HEAVY IONS IN SOLID TARGETS
Authors: WANG KE-MING  , SHI BO-RONG  , QU BAO-DONG  , WANG ZHONG-LIE  ,   山东大学物理系,济南250100
Published: December 2020

Based on Biersack's angular diffusion model, an effective method was established for calculating the mean project range of MeV heavy ions in solid targets. The calculated values are compared with recent experimental data on the mean project range for 1.0 MeV In+, Xe+, Ta+ and 1.0-2.0 MeV Pb+ The maximum difference-between present calculated values and experimental data is less than 8%, but the maximum differences between experimental data and calculated values by TRIM 86 and PRAL are 23% and 22%, respectively- The results show that the present calculation procedure is sucsessful for predicting the mean projected range on 1.0-2.0 MeV such heavy ions as In+, Xe+, Ta+ and Pb+ implanted in solid target (Si).
DECHANNELING EFFECTS OF CHARGED PARTICLES IN BENT CRYSTALS WITH VARYING CURVATURE
Authors: SHAO MING-ZHU  ,   重庆交通学院基础部,重庆630074
Published: December 2020

In the paper, the sine-squared potential and the parabola approximations of a bent crystal with a varying curvature have been introduced to discribe the dechan-neling effects of charged particles moving in such a crystal Furthermore, we show the possibilities of detlecting charged particles by a bent crystal, derive rhe dechan-nelling fraction of such a crystal and discuss the possible applications.
XPS AND AES STUDY FOR Pd/W/Si(lll) BILAYER INTERFACE
Authors: SHI YI-SHENG  , ZHAO TE-XIU  , LIU HONG-TU  , WANG XIAO-PING  ,   (1)中国科学技术大学物理系,合肥230026; (2)中国科学技术大学物理系,合肥230026;江苏盐城师范专科学校物理系,盐城224002
Published: December 2020

The Pd/W/Si(lll) interface reaction has been investigated by XRD, XPS and AES. As the annealing temperature was low, no reaction among Pd, W and Si can be detected, but W started to diffuse into Pd and Si started to diffuse into. W. When the annealing temperature was raised, Pd and W were mixed and Pd diffused into Si substrate. When the annealing temperature was raised further, the interface reaction leads to a redistribution of the two metals with accumulation of the refractory metal at the outer layer, such a layer can be used as a diffusion barrier to protect the inner shallow contact layer.