bluuebunny/crossref_metadata_2025 huggingface dataset:
PLASMA TEMPERATURE PROFILE OF D-T BURNING FOR THE BOHM TYPE
Authors: GONG XUE-YU  , LIN  QIU  , SHI BING-REN  , LONG YONG-XING  ,   (1)核工业西南物理研究院，成都  610041; (2)中南工学院技术物理系，衡阳  421001
Published: December 2020

By adopting the Bohm type thermal diffusivity coefficient which is applicable to JET,considering the effect of the α particle anomalous diffusion and the dynamic feedback heating,and using the energy transport equations of electron and ion,the plasma temperature profiles of deuterium-tritium (D-T) burning are studied under a given plasma density profile.Some results are obtained:the Bohm type thermal conductivity increases from the center of plasma to the boundary;in order to sustain D-T burning,the dynamic feedback heating power must be present,otherwise,the burning would be extinguished;the power coupling coefficient of α particle with the bulk plasma is less than one in the central part of the plasma,and much larger than one in the outer part;the stronger the α particle anomalous duffusion,the higher the central ion temperature.This is due to the smaller thermal diffusivity coefficient in the central part and the dynamic heating power to increase because of the lower central electron temperature;the energy amplifier factor Q under the Bohm type is smaller than under other types,therefore,the prospect of the Tokamak reactor operation model based on Bohm type is pessimistic.
OPTICAL PHASE CONJUGATION PROPERTY IN AZO-DOPED NEMATIC LIQUID-CRYSTAL FILM
Authors: XU ZE-DA  , LIU YAN-FA  , XIANG YING  , YANG JIE  , YOU SHI-JI  , SHE WEI-LONG  ,   (1)石家庄实力克液晶材料有限公司，石家庄  050071; (2)中山大学超快速激光光谱学国家重点实验室，广州  510275; (3)中山大学物理系，广州  510275
Published: December 2020

A method of generating optical phase conjugation by degenerate four-wave mixing in azo-doped nematic liquid crystal is proposed.The mechanism of liquid-crystal reorientation is analyzed.A simple physics picture is given,the theory is consistent with experiment results.The experiment results will have potential applications in nonlinear optics and other fields.
EFFECT OF BF+2 IMPLANTED IN HARDENED Si-GATE PMOSFET
Authors: ZHANG  TING-QING  , LIU  JIA-LU  , LI JIAN-JUN  , WANG JIAN-PING  , ZHANG ZHENG-XUAN  , XU NA-JUN  , ZHAO YUAN-FU  , HU YU-HONG  ,   (1)西安电子科技大学微电子研究所，西安  710071; (2)西安微电子技术研究所，西安  710054; (3)西北核技术研究所，西安  710024
Published: December 2020

The relation between the threshold voltage shift of BF+2 implanted Si-gate PMOSFET and the total γ-irradiation dose has been systematically studied,and the mechanism of γ-irradiation hardening for BF+2 implantation has also been analyzed in detail.The studies show that BF+2 implantation has a strong suppression for the threshold voltage shift of BF+2 implanted Si-gate PMOSFET under γ-irradiation;optimum BF+2 implantation dose in the hardened Si-Gate PMOSFET ranges from 5×1014—2×1015cm-2;F atoms distributed at SiO2/Si interface,which suppress the oxide-trap charges and interface-trap charges produced under γ-irradiation,may be the main origin of BF+2-implanted and hardened Si-gate PMOSFET.
Crystallization Dynamics and Magnetoresistance of La0.7Ca0.3MnO3 Synthesized by Mechanical Alloying
Authors: Jin Zhi-Qiang  , Qin Hong-Xia  , Zhang Jian-Rong  , Wang Dun-Hui  , Du You-Wei  ,   南京大学物理系，固体微结构物理国家重点实验室，南京 210093
Published: December 2020

Pure, single-phase La0.7Ca0.3MnO3 perovskites with giant magnetoresistance effect have been successfully prepared by mechanical alloying. The amorphous phase formed in milled smples transforms at about 920K into perovskite-type phase. Following the law of mass action, crystallization dynamics of the amorphous phase has been discussed. The activation energy for crystallization transformation is calculated to be about 265kJ/mol. The characterization of resistivity ρ(T) for La0.7Ca0.3MnO3 perovskites has also been investigated. At low temperatures T, ρ(T) has a directproportion dependence on T2. With increasing annealing temperature, the slope of ρ-T2 curve decreases. The temperature dependent magnetoresistance effect at temperatures far below the Curie temperature can be well expressed by the equation Δρ/ρ0=p1-p2T3/2-p3T5/2.
SUBGAP ABSORPTION AND QUANTUM LATTICE FLUCTUATION IN DEGENERATE AND NONDEGENERATE POLYMERS
Authors: ZHANG JIAN  , WU CHANG-QIN  , SUN XIN  ,   复旦大学理论物理研究中心，物理系，上海  200433
Published: December 2020

By using a simple model of soliton-antisoliton pairs to simulate the quantum lattice fluctuations in one-dimensional organic polymers, in which the subgap absorption results from the transitions between the lowest unoccupied and the highest occupied levels off the conduction and valence bands, respectively, in the soliton-antisoliton excitations. There is no gap in the absorption. Our result indicates clearly that the nondegeneracy of ground-states suppresses the quantum fluctuations, so that the subgap absorption is reduced and there is a related clear onset in the absorption spectrum of nondegenerate polymers, which is in agreement with experiments.
THERMOELECTRIC PROPERTIES AND STRUCTURE OF Sn-IMPLANTED LEAD TELLURIDE
Authors: ZHANG LIAN-MENG  , SHEN QIANG  , LI JUN-GUO  , WANG GUO-MEI  , TU RONG  , CHEN LI-DONG  , TOSHIO HIRAI  ,   (1)日本东北大学金属材料研究所，仙台  980; (2)武汉工业大学材料复合新技术国家重点实验室，武汉  430070; (3)武汉工业大学材料复合新技术国家重点实验室，武汉  430070；日本东北大学金属材料研究所，仙台  980
Published: December 2020

In this paper, it is reported that the Sn ions (200keV, 6×1016 and 1×1017ion/cm2) were implanted at room temperature into specimens of lead telluride. By making use of electric and thermal measurements, X-ray diffraction and X-ray photoelectron spectroscopy, we have studied the effects of implantation on the thermoelectric properties and the structure of implanted layer of lead telluride.
QUANTUM MECHANICAL TREATMENT OF A R(t)LC MESOSCOPIC CIRCUIT
Authors: LING RUI-LIANG  ,   江苏省常熟高等师范专科学校物理系，常熟  215500
Published: December 2020

A quantization scheme for a R(t)LC mesoscopic circuit has been given,in which we employ the canonical transformation and Feynman's path integral method.The charge and generalized current quantum fluctuation of the circuit are discussed,and the uncertainty relation of charge and generalized current has also been shown.
SPECTRAL TRANSMISSION AND REFLECTION OF THE DOPING SEMICONDUCTOR/METAL FILMS SYSTEMS
Authors: LI DAN-ZHI  ,   上海大学物理系，上海  201800
Published: December 2020

The paper presents that the plasma frequency ωp of semiconductor films are regulated by the way of changing its doping concentration,which lead to high transmission.Zone of the film shift visible spectral rang Vω,the semiconductor film is combined with the metal which thinness induced transmission frequency ωg locate in the edge of ultra violet range to compose the excellent D/M spectral transmission and reflection film systems.Besides,it is also necessary to select the most suitable combination of the thickness between the semiconductor and the metal films for forming the excellent transparent heat insulation film.
MAGNETIC SCATTERING EFFECT ON QUANTUM TRANSPORT IN THE NORMAL METAL FERROMAGNET INSULATOR-d WAVE SUPERCONDUCTOR JUNCTIONS
Authors: DONG ZHENG-CHAO  ,   江苏省淮阴师范学院物理系，淮阴  223001
Published: December 2020

Taking into account the rough interface scattering and magnetic scattering effects of the ferromagnet layer in the normal metal-ferromagnet insulator-d wave superconductor junctions,using Bogoliubov-de Gennes equations and Blonder-Tinkham-Klapwijk model,we have calculated the differential conductance.It is found that:1)both rough interface scattering and magnetic scattering can suppress the zero-bias conductance peaks(ZBCP),in which the magnetic scattering can lead to a splitting of the ZBCP but the rough interface can resist the splitting,and the ZBCP will evolve some dips due to two higher potentials of the scattering;2)the subgap resonances in the differential conductance are predicted under the condition of a ferromagnet layer located at a distance several times larger than the coherence length from the superconductor interface.
Oscillating Behavior of Magnetization in Pd/Fe and Dilute PdFe/Fe Multilayers
Authors: Wang Jing  , Wang Yin-Jun  , Zhan Wen-Shan  , Zhao Hong-Wu  , Shen Bao-Gen  ,   中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080
Published: December 2020

Pd1-xFex/Fe multilayers (MLs) with x=0,0.34,0.056,0.071 have been prepared by magnetron sputtering. The measurement of saturation magnetization in Pd/Fe MLs in the range of Pd thickness from 4to 18 ML shiows that the interlayer couplings are ferromagnetic and Ms possesses a long-range oscillation with a period of 4 ML Pd. The oscillation phase and period in Pd0.966Fe0.034/Fe and Pd0.944Fe0.056/Fe multilayers remain unchanged as compared with their reference Pd/Fe multilayers. A discussion is given about discrepancy between theory and experiments, concerning with whether a negative polarization of Pd in inner spacer and a long-range ferromagnetic oscillation appears in Pd/Fe systems.
Structure and Magnetic Properties of Melt-Spun Pr(Fe1-xCox)2 Alloys
Authors: Tang Shao-Long  , Cao Qing-Qi  , Wang Dun-Hui  , Zhang Jian-Rong  , Zhang Shi-Yuan  , Du You-Wei  ,   南京大学物理系，固体微结构物理国家重点实验室，南京 210093
Published: December 2020

Pr(Fe1-xCox)2 ribbons have been prepared by melt-spinning method. Their structure, magnetic properties and thermal stability are investigated. It is found that Pr(Fe,Co)2 cubic Laves phase can form only when x≥0.2 at wheel speed of 45m/s. For Pr(Fe0.6Co0.4)2 alloy, at wheel speed of 30m/s, the ribbon consistes of a mixture of Pr2(Fe,Co)17, Pr(Fe,Co)2 and rare earth-rich phase. Almost Pr(Fe0.6Co0.4)2 compound a small amount of amorphous phase is observed at wheel speed up to 45m/s. Pr(Fe0.6Co0.4)2 compound becomes unstable above 770℃. The resub-bonded Pr(Fe0.6Co0.4)2 nanocrystalline compound which is obtained at wheel speed of 40m/s combines high magnetostriction (λ∥-λ⊥=140×10-6), with significant magnetic coercivity, iHc=398kA/m.
The Hall Effect in Ni0.8Co0.2-SiO2 Granular Film
Authors: Ni Gang  , Lu Jun  , Xu Qing-Yu  , Sang Hai  , Du You-Wei  ,   南京大学固体微结构物理国家重点实验室，南京 210093
Published: December 2020

The Hall effect in Ni0.8Co0.2-SiO2 granular films which were fabricated by ion beam sputtering technique was studied. The saturated Hall resistivity reached 6.3μΩ·cm in an applied field of 9.5×105 A/m at room temperature when NiCo volume fraction x is near the metal-insulator transition threshold. The temperature dependence of resistivity in these samples with different NiCo compositions was also investigated. It showed-lg T dependence in low x samples, which gradually showed metallic as x increased. Transmission electron microscopy and vibrating sample magnetometer were used to study the microstructures and magnetic properties, the dependence of transport properties on microstructure was also discussed.
Effects of Carbon Content on the Formation and Critical Temperature of Y-Ni-B-C Superconductor
Authors: Wang Fang-Wei  , Yan Qi-Wei  , Yuan Peng  , Shen Bao-Gen  , Zhang Pao-Lin  ,   中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080
Published: December 2020

In this paper, we report the formation and superconductivity of quaternary intermetallic system Yni2B2Cx with ThCr2Si2-type structure. Samples prepared by arc-melting crystallize in single phase of the composition of YNi2B2Cx when x=0.9—1.2 while the secondary unknown phases increase obviously when x＜0.8 or x＞1.2. Superconducting-transition temperature Tc determined by the tem,perature dependence of magnetization displays two steps with increasing carbon concentration: Tc≈12.5K for x≤0.8, Tx≈15K for x≥0.9.
Structural and Magnetic Properties of Nanocomposite Alloy Nd4.5Fe76.3Ga0.3Co1.0B18
Authors: Dong Sheng-Zhi  , Li Xiu-Mei  , Li Wei  ,   钢铁研究总院功能材料研究所，北京　100081
Published: December 2020

Morphological alloy of Nd4.5Fe76.3Ga0.3Co1.0B18 prepared by rapid quenching was crystallized to obtain the manocrystalline permanent magnetic materials in which Fe3B were the dominant phases. The X-ray diffraction method, the transmission electron microscopy technique and magnetic measurement were used to analyze the microstructure and magnetic properties of the nanocomposite materials. The relationship of the microstructure, the magnetic properties with the exchange coupling interaction between crystallites was studied by determining the δM curve of the nanocomposite magnets.
Effect of Annealing on Microstructure of Ni80Fe20/Cu Multilayers
Authors: Xu Ming  , Chai Chun-Lin  , Luo Guang-Ming  , Yang Tao  , Lai Wu-Yan  , Mai Zhen-Hong  ,   (1)中国科学院物理研究所磁学国家重点实验室，北京 100080; (2)中国科学院物理研究所与凝聚态物理中心，北京 100080
Published: December 2020

[Ni80Fe20/Cu]15 multilayers were fabricated by dc-magnetron sputtering and annealed at 150, 250 and 350℃, respectively. The structures were investigated by low-angle and high-angle X-ray diffraction. It was found that, as the annealing temperature increases, the [111] preferred orientation of superlattices is improved slightly, while the superlattice period, interplane distance, average multilayer coherence length decrease. The interfacial roughness increases with the increase of annealing temperature and/or annealing time, this can be attributed to the Ni80Fe20 and Cu sublayers has been revealed by simulation of high-angle X-ray diffraction, and its thickness increases as the annealing temperature of annealing time increases. The simulation results furthermore showed that the interplane distances of the Ni80Fe20 layer keeps constant, and that the Cu layer decreases slightly as the annealing temperature increases.
Study on Dispersions of Width Mode of Magnetostatic Surface Wave Propagating in Periodic Multilayer Films
Authors: Liu Ying-Li  , Zhang Huai-Wu  , Wang Hao-Cai  , Zhong Zhi-Yong  ,   电子科技大学信息材料工程学院，成都　610054
Published: December 2020

The general dispersion relation of width mode of the magneto-static surface wave (MSSW) propagating in YIG multilayer films with finite sample width and arbitrary parameters is established. The theory includes all the situations of MSSW dispersion control by multilayer films and is in a better agreement with the actual situation. The dispersion of MSSW width mode in [(YIG/GGG)10/metal] periodic multilayer films were numerically investigated by applying the theory. Numerical results showed that the main working mode of MSSW propagating in multilayer YIG films is the first order width mode, the dispersion of MSSW can be controlled efficiently by the multilayer periods and the parameters of each layer. It also is influenced by the sample width.
THE SOLITON SOLUTIONS FOR A CLASS OF NONLINEAR COUPLED EQUATIONS
Authors: LIU CHUN-PING  ,   扬州大学理学院数学系，扬州  225002
Published: December 2020

Some soliton solutions for a class of nonlinear coupled equations are obtained by double parameter hypothesis. Many well-known equations in physics are special cases of the coupled equations presented in this paper. Some incorrect conclusio n in the literature are corrected.
BOSE-EINSTEIN CONDERSATION OF NEUTRAL ATOMS WITH ATTRACTIVE INTERACTION IN A HAR MONIC TRAP
Authors: YAN KE-ZHU  , TAN WEI-HAN  ,   上海大学物理系，上海  201800
Published: December 2020

In this paper we present the numerical solutions of neutral atoms with attractive interaction in a harmonic trap. The calculated result shows the bistability curve of the number of condensate atoms versus the energy eigenvalues. The maximum number of atoms in and attractive Bose-Einstein condensate deduced hereby is in agreement with the experimental on the whole.
THE GEOMETRICAL PICTURE OF MIXED ENTANGLED STATES
Authors: SHI MING-JUN  , DU JIANG-FENG  , ZHU DONG-PEI  , RUAN TU-NAN  ,   (1)中国科学技术大学近代物理系，合肥  230027; (2)中国科学技术大学量子通讯和量子计算开放实验室，合肥  230026；中国科学技术大学近代物理系，合肥  230027
Published: December 2020

The vector representation of density matrix is given in this paper. Any density matrix can be expanded in a real linear Hilbert space. The criteria for insepara bility of mixed states can be expressed in the geometrical picture. Such express ion is concise and perceptible. The neighborhood of the maximal mixed state is analyzed and a stronger result about the volume measure of the neighborhood is obtained.
INCOHERENTLY COUPLED SCREENING-PHOTOVOLTAIC SOLITON PAIRS
Authors: HOU CHUN-FENG  , YUAN BAO-HONG  , SUN XIU-DONG  , XU KE-BIN  ,   哈尔滨工业大学物理系，哈尔滨  150001
Published: December 2020

It is predicted in this paper that incoherently coupled screening-photovoltaic s oliton pairs are possible in biased photovoltaic-photorefractive crystals under steady-state conditions.These soliton pairs are established by the solitary beam s which have the same polarization,wavelength,and are mutually incoherent.The sc reening-photovoltaic soliton pairs can be considered as the united form of scree ning soliton pairs and closed-circuit photovoltaic soliton pairs.They reduce to screening soliton pairs in the absence of photovoltaic effect,whereas they becom e photovoltaic soliton pairs under the closed-circuit condition when the bias fi eld is not applied.
EXPERIMENT AND THEORY ON DIFFRACTION FROM LASER-INDUCED PHASE-HOLE IN POLYMER FI LM
Authors: REN LI-YONG  , YAO BAO-LI  , HOU XUN  , YI WEN-HUI  , WANG MIN-QIANG  ,   (1)西安交通大学精细功能电子材料与器件国家专业实验室，西安  710049; (2)西北大学物理系，西安  710069; (3)中国科学院西安光学精密机械研究所瞬态光学技术国家重点实验室，西安  710068
Published: December 2020

Concentric diffraction rings with bright center in the far field and dark center in the near field of the probe beam were experimentally observed when a strong pump laser beam (526nm) and a weak probe laser beam (632.8nm) cross under the no nlinear medium film (Polypyrrylarylenemethine/polyvinyl film).Based on Fresnel-K irchhoff diffraction integral equation,this phenomenon can be explained by the d iffraction effect of the probe beam from the laser-induced phase-hole in the non linear medium caused by the pump beam.The numeric calculations give good agreeme nt with the experimental results.
EXCHANGE BIASING IN MOLECULAR-BEAM-EPITAXY-GROWN Fe/Fe50Mn50 BILAYERS
Authors: JING CHAO  , JIN XIAO-FENG  , DONG GUO-SHENG  , GONG XIAO-YAN  , YU LI-MING  , ZHENG WEI-MIN  ,   (1)复旦大学应用表面物理国家重点实验室，上海  200433; (2)上海大学物理系，上海  200436; (3)中国科学院上海技术物理研究所红外物理实验室，上海  200083
Published: December 2020

Exchange biasing and coercive field of molecular-beam-epitaxy-grown Fe/Fe50 Mn50 bilayers have been investigated by Surface Magneto-optical Kerr Effect(SMOKE) and ferromagnetic resonance measurements. The results indica te that there is no exchange biasing when the thickness of antiferromagnetic lay er is less than 55nm. The exchange biasing appears when the thickness of antif erromagnetic layer is greater than 55nm，and the maximum value is reached when the thickness is about 7nm. Exchange biasing and coercive field decrease with f urther increase of the thickness of the antiferr-magnetic layer. The ferromagnet ic resonance measurement results show that there exists unidirectional anisotrop y. The above results are discussed in the paper.
RESISTANCE ANOMALY IN SUPERCONDUCTING Bi2Sr2CaCu2O8 SINGLE CRYSTALS
Authors: WANG WEN-HU  , ZHOU YU-QIN  , ZHENG PING  , CHEN ZHAO-JIA  , WANG NAN-LIN  , WANG YU-PENG  ,   中国科学院物理研究所凝聚态物理中心，北京  100080
Published: December 2020

We have measured the resistance of some Bi2Sr2CaCu2O8 superconducting single crystals along ab plane and the c axis. In some single crystals, a remarkable resistivity anomaly near the superconduct ing transition temperature is observed in the ab plane. The peak is suppressed a nd vanishes gradually with increasing applied magnetic field (>100Gs) or transpo rt current. We proposed that the resistance peak is a quasi-reentrant behavior d ue to the inhomogeneous distribution of the superconducting phase.
YBCO STEP-EDGE JUNCTION DC-SQUID PLANAR GRADIOMETER
Authors: HAN BING  , CHEN GENG-HUA  , XU FENG-ZHI  , ZHAO SHI-PING  , YANG QIAN-SHENG  ,   中国科学院物理研究所，凝聚态物理中心，北京  100080
Published: December 2020

A dc-SQUID planar gradiometer has been fabricated with YBa2Cu3O7-δ step-edge Josephson junctions on a 10mm×10mm single crysta l SrTiO3 ［100］ substrate. The gradiometer has a pair of pickup loop s with an area of 33 mm2 and the baseline of 45mm. The system opera tes well in unshielded environment. A rejection of common mode fields of 14×1 02 in all directions and a field gradient sensitivity (white noise) b etter than 8pT/cmHz at 77K have been achieved.
OPTICAL PROPERTIES OF ORGANIC MICROCAVITY BASED ON POROUS SILICON BRAGG REFLECTOR
Authors: LU MING  , XU  SHAO-HUI  , ZHANG  SONG-TAO  , HE  JUN  , XIONG  ZU-HONG  , DENG  ZHEN-BO  , DING  XUN-MIN  ,   复旦大学应用表面物理国家重点实验室，上海  200433
Published: December 2020

The construction of an organic microcavity with an organic light-emitting thin f ilm sandwiched between a porous silicon Bragg reflector and a silver film is dem onstrated.The peak widths of the PL spectra are greatly reduced from 83nm to 4nm as compared with those measured from non-cavity structures.The off-resonant opt ical modes are highly depressed.As is always observed from an optical microcavit y,the peak intensity is enhanced,and the peak position shows a blue shift with i ncreasing exit angles.
EFFECT OF SUBSTITUTION OF Ni BY Cu ON SPECIFIC HEAT OF CeNiSn
Authors: HU XIAO-HUA  , CHEN   ZHAO-JIA  , LUO JIAN-LIN  , WANG YU-PENG  , BAI HAI-YANG  , JIN DUO  ,   中国科学院物理研究所凝聚态中心极低温实验室，北京  100080
Published: December 2020

CeNiSn is an interesting heavy fermion compound,with its ground state being a Kondo insulator.The effect of the substitution of Ni by Cu on the specific heat of CeNi1-xCuxSn polycrystal samples is studied through the m ethod of chemical element substitution.A series of samples (x=00,0.02,0.06,0.0 6) were prepared with an electric arc furnace in the atmosphere of flowing high purity argon gas.X-ray powder diffraction analysis shows that all the final samp les have single-phase structure,and that,with the increase of the substitution a mount of Ni,the crystal parameters of the samples become larger.The specific hea t measurements were performed with an adiabatic colorimeter.The results indicate that the doping of Cu increases the specific heat at low temperature,and that t he V-shape gap is gradually suppressed.The physical mechanism may be that the do ping of copper brings about the Kondo lattice discorder and the increase in 3d e lectrons.
SIMILARITY REDUCTIONS FOR A NONLINEAR WAVE EQUATION WITH DAMPING TERM
Authors: YAN ZHEN-YA  , ZHANG HONG-QING  ,   大连理工大学应用数学系，大连  116024
Published: December 2020

Three types of similarity reductions are obtained for nonlinear wave equation with damping term utt-2buxxt+αuxxxx=β(unx)x(α>0,β≠0,n≥2)by the use of the direct reduction method due to Clarkson and Kruskal.It is shown that this equation is not integrable under the sense of Ablowitz's conjecture by analysing the Painlevé properties of these reduction equations.In addition,four families of exact solutions are found for this equation(n=2).
AN OCCASIONAL LINEAR FEEDBACK APPROACH TO CONTROL CHAOS
Authors: LI GUO-HUI  , ZHOU SHI-PING  , XU DE-MING  , LAI JIAN-WEN  ,   (1)上海大学理学院，上海  201800; (2)上海大学通信与信息工程学院，上海  201800
Published: December 2020

This paper proposes an approach to control chaos based on occasional linear feedback.This scheme is composed of control and non-control phases.The different stable periodic orbits are obtained by adjusting the feedback coefficients and the time duration which the control phase occupies.We also simulate acousto-optic bistable model and Henon-like attactor.The results from the numerical simulation show that the method can switch effectively the system to the desired periodic orbits.
QUANTUM PROPERTIES OF LIGHT IN THE SYSTEM OF TWO-MODE SQUEEZING VACUUM FIELD INTERACTING WITH TWO COUPLING-ATOMS
Authors: HUANG CHUN-JIA  , ZHOU MING  , LI JIANG-FAN  , KONG FAN-ZHI  ,   长沙电力学院物理与信息工程系，长沙  410077
Published: December 2020

The squeezing and coherence properties of the light in the system of two-mode squeezing vacuum field interacting with two coupling-atoms are studied in the framework of quantum theory.The relation between the quantum properties of the light and the characteristics of the system itself is discussed.
STUDIES ON RANDOMNESS AND NUCLEATION RATE OF SUPERCOOLED WATER FREEZING FROM HOMOGENEOUS NUCLEATION
Authors: QU KAI-YANG  , JIANG YI  ,   清华大学热能工程系，北京  100084
Published: December 2020

The dependence of the probability of the supercooled water freezing from homogeneous nucleation on the volume, time and temperature was deduced based on the “continuum” model of water structure put forward by Stanley and Teixeira. The homogeneous nucleation rate of supercooled water freezing was then calculated. The results agreed with the experimental measurements. The calculation of the pre-exponential factor, which is a key for the classical nucleation theory and the density functional method,is not needed for this method.
MONTE CARLO SIMULATION OF THIN FILMS GROWTH
Authors: YANG NING  , CHEN GUANG-HUA  , ZHANG YANG  , GONG WEI-BIN  , ZHU HE-SUN  ,   (1)北京工业大学材料科学与工程学院，北京  100022; (2)北京理工大学材料科学研究中心，北京  100081
Published: December 2020

Two-dimensional growth of thin films is simulated using the Monte Carlo method.The effect of the interaction between particles on the morphology of the films at the preliminary stage has been investigated using Morse potential.The growth of films consists of four stages,including formation of critical nucleus,growth of clusters,formation of maze structure and appearance of continuous film.The simulated results indicate that the percentage of particles,with monomers being not included,decreases with the increase of the number of adatoms,which is in agreement with the actual conditions.
STUDY ON MICRO FRICTION AND ADHESION FORCE OF OTS SELF-ASSEMBLED FILM(Ⅱ)EXPERIMENT AND ANALYSIS OF ADHESION FORCE
Authors: QIAN LIN-MAO  , LUO  JIAN-BIN  , WEN SHI-ZHU  , XIAO XU-DONG  ,   (1)清华大学摩擦学国家重点实验室，北京  100084; (2)香港科技大学物理系，香港
Published: December 2020

The adhesion characteristic of surfaces of SiO2 and the self-assembled film of octadecyltrime-thoxysilane (OTE SAM) on the surface of SiO2 under the relative humidity of 5%—99% were studied using atomic force microscopy/friction force microscopy.Experimental results indicate that the adhesion force of SiO2 increases first with the relative humidity and then decreases sharply.However,the adhesion force of OTE SAM surface hardly changes with the relative humidity due to its strong hydrophobe property.The mechanism of the adhesion force changing with the relative humidity has been analyzed from the viewpoint of surface tension,van der Walls force,and basic bond forces.
NON-FERMI-LIQUID BEHAVIOR WITH ONE-BODY IMPURITY POTENTIAL
Authors: CAO TIAN-DE  , CHEN  MIN  , WANG QING  ,   南昌航空工业学院测控工程系，南昌  330034
Published: December 2020

The non-Fermi liquid behavior of electrons with one-body impurity potential has been investigated.The electrons in an n(=3,2,1) dimensional system may have non-Fermi liquid properties,whether the electrons are in bound state or not,when a single-impurity model is introduced.
FERROELECTRIC BEHAVIORS OF BaTiO3 IN TRANSVERSE-FIELD ISING MODEL
Authors: ZHANG LEI  , ZHONG WEI-LIE  ,   山东大学物理系，济南  250100
Published: December 2020

By using the transverse-field Ising model, the possible contribution of the quantum effect to the ferroelectric behaviors for BaTiO3 was described. It is found that the quantum effect can reduce the ferroelectric polarization obviously. The theoretical results based on the new model are in good agreement with the experimental ones.
INVESTIGATION OF DIFFUSED PHASE TRANSITION AND POLAR RELAXATION IN Pb(Zr,Sn,Ti)O3 ANTIFERROELECTRIC CERAMICS
Authors: LIU PENG  , YANG TONG-QING  , ZHANG LIANG-YING  , YAO XI  ,   (1)陕西师范大学物理系，西安  710062; (2)同济大学功能材料研究所，上海  200092; (3)同济大学功能材料研究所，上海  200092；西安交通大学电子材料研究所，西安  710049
Published: December 2020

Microstructure and electrical properties of lanthanum-modified Pb(Zr,Sn,Ti)O3(PZST) antiferroelectric (AFE) ceramics have been investigated by weak field dielectric, pyroelectric response, strong field polarization, and X-ray diffraction (XRD) techniques at different temperatures. Diffused phase transition and dielectric frequency dispersion (0.1—100kHz) have been observed within the temperature range of -100—50℃. However, XRD indicates that AFE ceramics are of tetragonal phase within the above-mentioned temperature range. Under a strong electric field, AFEt will be switched to a metastable ferroelectric (MFE) state, accompanying with the disappearance of dielectric frequency dispersion. Then the MFE state changes to AFE state again as temperature increases, producing a strong pyroelectric current peak. A new model considering compositional fluctuation on a nanometer scale in PZST antiferroelectric ceramics has been suggested to explain the polar relaxation in AFE state.
PHASE SYNCHRONIZATION IN COUPLED CHAOTIC SYSTEMS：TRANSITIONS FROM HIGH-TO LOW-D IMENSIONAL CHAOS
Authors: ZHENG ZHI-GANG  , HU GANG  , ZHOU CHANG-SONG  , HU BAM-BI  ,   (1)北京师范大学物理系，北京  100875; (2)北京师范大学物理系，北京  100875；香港浸会大学物理系及非线性研究中心，中国香港; (3)香港浸会大学物理系及非线性研究中心，中国香港; (4)香港浸会大学物理系及非线性研究中心，中国香港；休斯顿大学物理系，Taxes  77204，美国
Published: December 2020

Phase synchronization in coupled chaotic systems is an interesting topic in recent years on nonlinear dynamics. Phase synchronization implies an ordered behavio r embedded in chaotic motions. Recent progress on phase synchronizations is revi ewed.The synchronization process is exhibited by applying the bifurcation tree.T he synchronization process is identified as transitions from high-to low-dimensional chaos.An alternative phase locking among various rational ratios is found. Chaos suppression and the restoration to chaos synchronization via period-doubli ng is studied.It is found that asymmetric coupling can greatly enhance the phase synchronization of coupled oscillators.
HARD X-RAY PHASE-CONTRAST IMAGING
Authors: D.C.GAO  , A.POGANY  , A.W.STEVENSON  , T.GUREYEV  , S.W.WILKINS  , MAI ZHEN-HONG  ,   (1)Commonwealth Science and Industry Research Organization Manufacturing Science &  Technology PB 33,Clayton South MDC,Victoria  3169,Australia; (2)中国科学院物理研究所和凝聚态物理中心，北京  100080
Published: December 2020

Conventional X-ray radiography is based on absorption contrast and assumes geome trical optics. An “in-line” method and theory of hard X-ray phase-contrast ima ging were introduced. The differences between the conventional X-ray absorption contrast image and the phase contrast image were distinguished by using radiogra phs of biological samples. The effect of X-ray source size on the image contrast was investigated. Moreover, the key parameters of absorption contrast image and phase contrast image were simulated theoretically and discussed.
THE MODEL OF MAGNETICALLY CONFINED DISCHARGE CO LASER
Authors: WANG TAO  , CHENG QING-MIN  , MAO DAI-SHENG  ,   华中理工大学激光技术国家重点实验室  武汉  430074
Published: December 2020

A model for magnetically confined discharge carbon monoxide laser is presented. Electron energy distribution function, the influence of the magnetic field on electron impact excitation, the vibration-to-translation and vibration-to-vibratio n excitation rates of CO molecule are discussed. The vibrational-state populatio ns of CO molecule and small-signal gain with magnetic field are calculated and s tudied also. After a magnetic field has been added， there appears a hole in the distribution of the vibrational-state populations of CO molecule and the small- signal gain is higher in this region.
NOVEL COUPLED MULTI-ACTIVE REGION HIGH POWER SEMICONDUCTOR LASERS CASCADED VIA T UNNEL JUNCTION
Authors: LIAN PENG  , YIN  TAO  , GAO GUO  , ZOU DE-SHU  , CHEN CHANG-HUA  , LI JIAN-JUN  , SHEN GUANG-DI  , MA XIAO-YU  , CHEN LIANG-HUI  ,   (1)北京工业大学电子工程系和北京市光电子技术实验室，北京  100022; (2)中国科学院半导体研究所，北京  100083
Published: December 2020

A novel semiconductor laser structure is put forward to resolve the major difficulties of high power laser diodes. In this structure, several active regions are cascaded by tunnel junctions to form a large optical cavity and to achieve super high efficiency. This structure can solve the problems of catastrophic optical damage of facet, thermal damage and poor light beam quality effectively. Low-pressure metalorganic chemical vapor deposition method is adopted to grow the novel semiconductor laser structures, which are composed of Si:GaAs/C:GaAs tunnel junctions, GaAs/InGaAs strain quantum well active regions. External differential q uantum efficiency as high as 2.2 and light power output of 2.5W per facet (under 2A drive current) are achieved from an uncoated novel laser device with three a ctive regions.
THEORETICAL MODEL FOR THE HEAVY PARTICLE TRANSPORT IN A CATHODE SHEATH
Authors: WANG DE-ZHEN  , MA TENG-CAI  ,   大连理工大学物理系，三束材料改性国家重点实验室，大连  116024
Published: December 2020

A theoretical model for studying the heavy particle transport in a cathode sheath is developed.The velocity distribution functions near a planar cathode are deduced.The expressions for neutral and ionic fluxes of neutral and ionic particles near a planar cathode are also obtained.The result predicated by the theoretica l model is in accordance Monte Carlo simulation.
EXPERIMENTAL STUDY ON X-RAY SPECTRA FROM GOLD FOIL TARGET IRRADIATED BY 1.053μm LASER
Authors: YANG JIA-MIN  , DING YAO-NAN  , SUN KE-XU  , HUANG TIAN-XUAN  , ZHANG WEN-HAI  , WANG YAO-MEI  , HU XIN  , ZHANG BAO-HAN  , ZHENG ZHI-JIAN  ,   中国工程物理研究院核物理与化学研究所，绵阳市919信箱-216分箱，绵阳  621900
Published: December 2020

X-ray spectra, angular distributions of X-ray fluxes and evolutions of X-ray spe ctra from the front and the rear of gold foil target with different thickness ha ve been measured on “Xingguang” laser facility, in which the gold foil targets were irradiated by smoothing 1.053μm laser beam . The processes of laser and r adiation ablation to gold foil have been studied. Quantitative X-ray spectra fro m the front and the rear of gold foil under several conditions such as different foil thickness, different laser power densities and X-ray emission angles have been obtained. At the same time, radiative heat wave has also been observed fro m the evolutions of X-ray spectra emitted from the rear of gold foils of differe nt thickness.
FP-LMTO STUDY OF THE STRUCTURE AND MAGNETISM OF IRON UNDER HIGH PRESSURES
Authors: ZHAN QING-FENG  , KONG YONG  , CHEN ZI-YU  , LI FA-SHEN  ,   兰州大学磁学与磁性材料教育部重点实验室，兰州  730000
Published: December 2020

Full-Potential-Linear-Muffin-Tin-Orbital(FP-LMTO) method was employed to study t he structure and magnetism of iron.The three possible structures of iron were in vestigated over a range of atomic volumes in three magnetic states respectively. The total energies and magnetic moments in various volumes were obtained.The rel ations of pressure vs volume and bulk modulus vs volume were deduced also.The st ructural and magnetic stability of all the possible phases was discussed in diff erent ranges of atomic volume.The α→ε phase transition pressure was evaluated .By comparing our results with the experimental ones,they are in good agreement.
MAGNETIC BEHAVIOUR OF ISING MULTILAYERS
Authors: ZHOU YUN-SONG  , CHEN JIN-CHANG  , LIN DUO-LIANG  ,   (1)纽约州立布法罗大学物理系,布法罗  14260，美国; (2)首都师范大学物理系,北京  100037
Published: December 2020

The magnetic behavior of Ising multilayer system including nearest neighbor and next nearest neighbor interactions is investigated by use of variational cumulan t expansion (VCE) method. The formulae for spontaneous magnetization, coercivity , Curie point, Neel point, susceptbility and molecular field parameters respondi ng to the number of layers are deduced and discussed numerically. It is exactly demonstrated that, in 2-dimensional and 3-dimensional systems, the spontaneous m agnetization calculated by first order of the VCE is the same as the results of mean field theory. This means that the first order of VCE is valid in low temper ature. The validity of VCE in high temperature (above the critical point) is exp lained by the physical meaning of VCE method.
STUDIES OF GRAVITY BEHAVIORS IN THE COURSE OF PRODUCING AlN AND TiC MATERIALS(Ⅰ )
Authors: JIANG GUO-JIAN  , ZHANG QING-XUE  , ZHUANG HAN-RUI  , LI WEN-LAN  , LI MAO-ZI  ,   (1)中国科学院空间应用与发展中心,北京  100080; (2)中国科学院上海硅酸盐研究所,上海  200050
Published: December 2020

The gravity behaviors in the combustion synthesis of Ti and carbon on the parabolic flight aircraft were investigated. The results showed that the combustion te mperatures vary with different gravity levels. Moreover, the study of gravity ef fect on combustion reaction in different sample orientations was also investigated.
STUDIES OF GRAVITY BEHAVIORS IN THE COURSE OF PRODUCING AlN AND TiC MATERIALS(Ⅲ )
Authors: JIANG GUO-JIAN  , ZHANG QING-XUE  , ZHUANG HAN-RUI  , LI WEN-LAN  , LI MAO-ZI  ,   (1)中国科学院空间应用与发展中心,北京  100080; (2)中国科学院上海硅酸盐研究所,上海  200050
Published: December 2020

The first and preliminary investigation of AlN composites thermal-treated under normal gravity and microgravity conditions by using chemical ovens was conducted during aircraft parabolic flights. The results indicated that, different micros tructures in the samples are associated with gravity level during parabolic flig ht, and microgravity condition allows the synthesis of AlN-borosilicate glass co mposite with improved microstructure, as compared with that under the terrestria l condition. It is favorable to produce AlN-borosilicate glass composites with a relatively uniform distribution of composition and structure. Finally, the use of chemical oven and the potential of material synthesis under microgravity cond ition are appreciated.
SYNTHESIS AND MECHANISM OF BC2N THIN FILMS IN STALK-LIKE GROWTH
Authors: MA XI-YING  , HE DE-YAN  , CHEN GUANG-HUA  ,   (1)北京工业大学应用物理系,北京100022; (2)兰州大学物理科学与技术学院,兰州730000
Published: December 2020

The BC2N thin films in stalklike growth have been deposited by hot filament assisted and rf plasma chemical vapor deposition (CVD). It was shown that the composition of the thin films mainly consists of BC2N, in which B, C and N were combined in atomic bonds. And the surface of the film took the shape of stalks, they were in regular arrangemeut with a uniform orientation observed with scanning electron microscopy.-In addition, we found this kind of growth had intimate relation with the deposition parameters. Finally, we analyzed the growth machanism of the stalklike BC2N.
STUDIES ON THE PROPERTIES OF ELECTRONIC ENERGY SPECTRA FOR TWO DIMENSIONAL FIBONACCI-CLASS QUASICRYSTALS WITH ONE KIND OF ATOMS
Authors: YANG XIANG-BO  , XING DA  , LIU YOU-YAN  ,   (1)华南理工大学物理系,广州510640; (2)华南师范大学激光生命科学研究所,广州510631; (3)华南师范大学激光生命科学研究所,广州510631;华南理工大学物理系,广州510640;广东工业大学,广州510090
Published: December 2020

In the framework of the single-electron tight-binding nearest interaction on-site model, we have studied the splitting rules of electronic energy spectra for two-dimensional Fibonacci-class quasicrystals FC(n) with one kind of atoms by means of the decomposition-decimation method based on the renormalization-group technique and have also calculated the electronic energy spectra numberically. It was found that there are-only three kinds of clusters,n×n, n×(n+1), and (n+1)×(n+1) for all of the two-dimensional quasilattices FC(n) and the electronic energy bands split as Ym-n-l . The general formula of the energy level numbers was obtained. We discovered that there was a kind of so called Fibonacci class number sets for the parameters used to describe the energy level number and got the first 11 determined integers of the sets. The experienced formula have been sought out. The analytic results are confirmed by numerical simulations.
INTEGRATION THEORY OF THE DYNAMICS OF A ROTATIONAL RELATIVISTIC SYSTEM
Authors: LUO SHAO-KAI  , GUO YONG-XIN  , CHEN XIANG-WEI  ,   (1)辽宁大学物理系,沈阳110036; (2)商丘师范学院数学力学与数学物理研究所,商丘476000; (3)商丘师范学院数学力学与数学物理研究所,商丘476000;长沙大学数学力学与数学物理研究所,长沙410003
Published: December 2020

The basic integration theory of the dynamics of a rotational relativistic system is constructed.Firstly,the first integrals of the system are given.Secondly,the order of the equation of motion is reduced by using cyclic integrals and energy integrals,and thus the generalized Routh equation and generalized Whittaker equation are obtained.Thirdly,the canonical equation and variational equation of the system are established,and the integral invariant is constructed by using the first integrals.Fourthly,the integral variants and integral invariants of the Poincaré-Cartan type are given.Finally,some deductions are given.
THE ADAPTIVE CONTROL OF CHEN’S CHAOTIC SYSTEM
Authors: GUAN XIN-PING  , FAN ZHENG-PING  , PENG HAI-PENG  , WANG YI-QUN  ,   燕山大学电气工程学院,秦皇岛066004
Published: December 2020

The control of Chen's chaotic system when its parameters are known a priori or unknown is studied by means of a simple linear state feedback method. When the parameters are known a priori, we show the variation range of feedback gain; and when the parameters are unknown, an adaptive controller is designed, which overcomes the drawback that the control is discontinuous in a common adaptive controller. Finally the simulation results vertify the effectiveness of our proposed method.
FRACTAL AND MULTIFRACTAL DESCRIPTION OF SURFACE TOPOGRAPHY
Authors: SUN XIA  , WU ZI-QIN  ,   中国科学技术大学基础物理中心,合肥230026
Published: December 2020

Six regular surfaces with same root-mean-square(rms) roughness are constructed by six typical generators. Variation method is used to calculate the fractal dimensions of these surfaces. The results suggest that fractal dimension can describe total topography of a surface quantitatively and can distinguish the surfaces which have same rms roughness. Multifractal method is further used in the analysis of surface. It is found that multifractal spectrum can reflect the overall characteristic of the distribution of probability of a surface. The width of multifractal spectrum can characterize the degree of the undulation of a surface quantitatively. The difference of the fractal dimensions between the maximum probability and the minimum probability subsets can give a statistical result of the ratio between the numbers of lowest and highest sites.
SPATIAL SOLITONS IN PHOTOREFRACTIVE ORGANIC POLYMERS
Authors: HOU CHUN-FENG  , ABDURUSUL  , DU CHUN-GUANG  , SUN XIU-DONG  , LI SHI-QUN  ,   (1)哈尔滨工业大学应用物理系,哈尔滨150001; (2)清华大学物理系,北京100084; (3)新疆大学物理系,乌鲁木齐830046
Published: December 2020

The bright, dark and grey soliton solutions for optical wave evolution equations are presented in photorefractive polymer under a steady-state condition. The polarization property of these different soliton states and the dependence of the width of these polymeric solitons on external bias field are discussed in detail.
ELECTROMAGNETIC ADJOINT TRANSFORMATION AND MODE ANALYSIS FOR GUIDED WAVES IN AN OPTICAL FIBER
Authors: YU SHOU-MIAN  , YU TIAN  ,   (1)山东大学电子工程系,济南250100; (2)山东大学物理系,济南250100
Published: December 2020

The adjoint transformation of electromagnetic fields for uniform isotropic dielectric is considered for guided waves in an optical fiber. The necessary and sufficient condition for two solutions to be a pair of partners is derived. The modes of guided waves are analyzed under this condition. It is proved that the dispersive normal modes do not exist in the case of non-axial symmetry. The guided modes in such cases are modes of critical refraction, which has a discrete spectrum. The dispersive normal modes exist in axial symmetrical cases. Theoretical predictions are comparable with the experiment data. The behaviour of the fundamental mode shows that it is a mode of critical refraction rather than a dispersive normal mode as is predicted by the theory.
SIZE EFFECT ON ABSORPTION EDGES OFULTRA-FINE SnO2 NANOPARTICLES
Authors: KANG JUN-YONG  , S.TSUNEKAWA  , A.KASUYA  ,   (1)日本东北大学金属材料研究所,仙台9808577; (2)日本东北大学学际科学研究中心,仙台9808578; (3)厦门大学物理系,厦门361005
Published: December 2020

Aqueous sols containing nanocrystalline SnO2 particles with sizes less than 2 nm were prepared by ultra-filtration from original acidic and alkaline sols with SnO2 particles. The sizes of SnO2 nanocrystallines were determined by dynamic light scattering, X-ray diffraction, and computer analysis of nanocrystalline images of transmission electron microscopy. Blue shifts of absorption edges of the nanocrystallines were observed in both the ultra-filtrated acidic and alkaline sols. The results show that the blue shifts of the SnO2 nanocrystallines are mainly attributable to the size decrease for the same kind of nanocrystallines.
THE ULTRAVIOLET AND GREEN LUMINESCENCE CENTERS IN UNDOPED ZINC OXIDE FILMS
Authors: LIN BI-XIA  , FU ZHU-XI  , JIA YUN-BO  , LIAO GUI-HONG  ,   (1)中国科学技术大学结构分析开放实验室,合肥230026; (2)中国科学技术大学结构分析开放实验室,合肥230026,中国科学技术大学物理系,合肥230026; (3)中国科学技术大学物理系,合肥230026
Published: December 2020

Undoped ZnO films were deposited on Si substrates by DC reactive sputtering. The samples were annealed in air, pure O2 (1atm) and pure N2 (1atm) at 850℃,950℃,1000℃ for 1h. The X-ray diffraction patterns of the as-deposited and annealed samples all have a widened diffraction peak of ZnO (002). It is evident that all the films we used are ZnO films with [001] orientation. The photoluminescence (PL) spectra of these samples include two emission peaks, centered at 3.18eV (ultraviolet, UV) and 2.38eV (green). It is fount that the intensities of these peaks vary with annealing temperature and atmosphere. At same annealing temperature, the intensity of green peak increases evidently with the increase of oxygen partial pressure, and the intensity of UV peak is also increased somewhat. In the same atmosphere, the intensity of green peak enhances sharply with the increase of annealing temperature, but the intensity of UV peak increases slowly and approaches a maximum value at 950℃, then decreases as the annealing temperature increases.; We investigated the dependence of the crystallization and also the intrinsic defects in ZnO film, such as zinc vacancy VZn, oxygen vacancy VO, interstitial zinc Zni, interstitial oxygen Oi and anti-sited oxygen OZn on the annealing conditions. Compared with the calculated data of these intrinsic defects, it is suggested that the UV radiation of ZnO is due to band-edge exciton transition, and the green emission corresponds to the transition from the bottom of the conduction band to the local level composed of oxide misplaced defects.
INFLUENCE OF CH3CSNH2 PASSIVATION ON INTERFACE DIFFUSION BETWEEN FERROMAGNETIC METALS AND GaAs
Authors: ZHU CHUAN-GANG  , XU PENG-SHOU  , LU ER-DONG  , XU FA-QIANG  , PAN HAI-BIN  ,   (1)海军潜艇学院基础部,青岛266071; (2)中国科学技术大学国家同步辐射实验室,合肥230029
Published: December 2020

The influence of CH3CSNH2 passivation on diffusion at interface between ferromagnetic metals and GaAs has been studied. The experimental results show that sulfur passivation can change the chemical environment of As element , prevent As from diffusing into ferromagnetic metal overlayer, weaken the reaction of As with ferromagnetic metals and enhance the magnetism of the interface. Furthermore, we discussed the reason that S passivation can prevent As atoms diffusion.
DEPOSITION OF HIGH-QUALITY c-BN FILM ENHANCED BY PULSED DC BIAS TECHNIQUE
Authors: TIAN JING-ZE  , Lü FAN-XIU  , XIA LI-FANG  ,   (1)北京科技大学材料科学与工程学院,北京100083; (2)哈尔滨工业大学材料科学与工程学院,哈尔滨150001
Published: December 2020

Cubic boron nitride (c-BN) films were synthesized using magnetically enhanced active reaction evaporation system in which pulsed DC technique was employed to enhance the formation of c-BN film. The effect of pulsed DC bias, plasma discharge current, Ar/N2 flow ratio, substrate temperature on the formation of c-BN films was investigated. The friction of c-BN phase in the film increased with the increase of pulsed DC negative bias and discharge current.Almost single phase c-BN films were obtained when deposited at-155V of pulsed DC bias,15A of discharge current,500℃ of substrate temperature and 10 of Ar/N2 flow ratio.