bluuebunny/crossref_metadata_2025 huggingface dataset:
THE SUPERCONDUCTING-NORMAL TRANSITIONS OF FAST QUENCHED SUPERSATURATED SOLID SOLUTION Al-lat% Ge ALLOY
Authors: CHEN XI-SEN  , WANG ZU-LUN  , GUAN WEI-YAN  ,   中国科学院物理研究所
Published: November 2020

The microstructure and superconducting-normal transitions of fast quenched supersaturated solid solution Al-lat% Ge alloy have been studied. X-ray structural analysis of the sample indicated that Al-lat% Ge alloy consists of a homogeneous supersaturated α-Al(Ge) solid solution.The resistance measurement shows that for solid solution alloy α-Al(Ge) Tc≈1.44K, which is higher than that of pure Al.
DETERMINATION OF CRYSTAL STRUCTURE OF α-CHLORO-N-SEC-BUTYI-CINNAMIDE
Authors: ZHENG CHAO-DE  , GU YUAN-XIN  ,   中国科学院物理研究所
Published: November 2020

α-CHLORO-N-SEC-BUTYI-CINNAMIDE crystal (trans) belongs to orthorhombic system. The space group is D2h15-Pbca with eight molecules in a cell of dimension α= 18.842 (0.006)?, b=14.076 (0.006)?, c=10.077 (0.003)?. The intensity data were collected on RASA-IIS four-circle diffractometer. The number of independent reflexions is 929. The structure was solved by direct method (MULTAN-80). Refinement of structure parameters was achieved by block- matrix least-squares method, R =0.088.
THE DOUBLE IMPURITIES SCATTERING THEORY FOR "THE RESISTANCE MAXIMUM" PHENOMENA IN THE DILUTE MAGNETIC ALLOYS
Authors: WANG ZHONG-CHEN  , LIU FU-SUI  ,   北京大学物理系
Published: November 2020

Based on s-d interaction, we consider RKKY interaction existing between two magnetic impurities, and propose a new double impurities scattering model. According to this model, when an impurity spin makes spin flip scattering, its spin as an inner free degree will be confined by other impurities' spin, where the RKKY correlation exists between them. Because of this correlation, it will suppress its spin flip scattering. This suppression, coupled with the Kondo logT term, causes a local maximum. In this paper we have calculated all possible "DIS" diagrams (the double impurities self-energy diagrams) and found a term A/(T02-T2) contribute to the Kondo resistance, where A is a positive constant, T0 is some critical temperature. When T≤T0, this formula is meaningless. This theory is essentially different from the previous molecular field theory. Because it does not depend on the magnetic order in alloys, so, when T≥Tc (Tc is magnetic phase transion temperature), this mechanism still works but the molecular field theory does not. This mechanism is a paramagnetic effect. We have compared this theory with experimental curves of Cd-Mn (its impurity density is 0.1～0.01 at.%). We find that the agreement with experiments is good. Finally, we consider that this mechanism is the main reason to quench the Kondo log T divergence even for very dilute magnetic alloys in low temperature.
STUDY OF SURFACE POISONING AND REGENERATING ON LaNl5 BY SULPHIDES
Authors: YU XING-NAN  , ZHANG QING-ZHE  , XIE KAN  , KANG GIN  , LIN ZHANG-DA  ,   中国科学院物理研究所
Published: November 2020

This article is a brief summary of our study on poisoning and regenerating at the surface of LaNi5 by impurities, which are H2S, SO2 and CS2 contained in the hydrogen used. The AES, XPS analysises show that the feature of the poisoning for three sulfides are different: LaNi5 poisoned by H2S produces the surface compounds, such as La2S3 and NiS. The chemisorption and physisorption occured due to SO2 and CS2 poisoning respectively.In addition, surface catalystic property of active nickel on LaNi5 can be shown by evalution of the changes in the intensity of nickel peak in the Ni(2p3/2) spectrum. Pure hydrogen cycle method is effective for regeneration of LaNi5 poisoned by SO2 and CS2, but this is not true for H2S-poisoned samples. These results are very useful in explaining the mechanisms of rare earth intermetallic hydrides surface poisoning and regenerating.
CHARGE TRANSFER AT In-Si (111) INTERFACE AND SURFACE ELECTROMIGRATION OF INDIUM ADATOMS
Authors: ZHOU JUN-MING  ,   中国科学院物理研究所
Published: November 2020

For the first time, we found by EHEED that a part of indium adatoms on the Si(lll) surface transports easily under the influence of an applied dc electric field. According to the observation of the surface electromigration process, it is shown that the states of adsorption of indium atoms on a clean Si (111) surface can be characterized as two phases - the first interface layer bound to silicon surface tightly is hardly affected by a electric field, it is called the tightly bound layer; overlayers on the first layer bound to the first interface layer loosely, can transport along the direction of an applied electric field, they are called transport layers. From the temperature dependence of the transport mobility, we find that the activation energy of surface electromigration is △H = 0.43 eV.The charge transfer in the process of In-Si(111) interface formation has been investigated by measurements of the surface conductance. The results show that indium atom is adsorbed as surface deep donor. Surface electromigration is attributed to Coulomb force applied on the ionized indium atom.
CRYSTAL STRUCTURE OF POTASSIUM LANTHANUM METAPHOSPHATE
Authors: LIN YONG-HUA  , HU NING-HAI  , ZHOU QING-LIAN  , LIU SHU-ZHEN  ,   中国科学院长春应用化学研究所
Published: November 2020

The crystal of potassium lanthanum metaphosphate with composition KLa[PO3]4 belongs to monoclinic system. The space gr oup is P21 with lattice parameters α= 8.106(3)?, b= 8.551 (2)?, c = 7.326(3)?, β = 92.18(6)°. Two molecules are contained in the unit cell. A fullmatrix, least square refinement gave R=0.061, Rw = 0.062 for 1026 independent reflections. The basic structural units are helical ribbons, (PO3)n, formed by cornersharing tetrahedra of PO4. The LaO8 dodecahedra are isolated without sharing any O atom with each other, and K atom locate on the center of irregular interstitial polyhedra. The shorhest La-La distance is 7.063?.
ON WAVES IN NONADIABATIC AND NONEQUILIBRIUM GASES
Authors: Gao Zhi  , Lu Wen-qiang  ,   (1)中国科学院工程热物理研究所; (2)中国科学院力学研究所
Published: November 2020

This paper deals with the propagation of the waves (including relaxation, pressure, and density waves) and thermal mode in nonadiabatic and nonequilibrium gases. Based on the mechanism of thermal disturbance feedback, a new governing equation for the propagation of disturbances and the dispersion relation has been obtained. Some new conclusions are reached. For example, the disturbance is either purely growing or slow-damped which presents a reasonable explanation for abnormal absorptive phenomena of infrasonic sound waves in atmosphere; nonadiabatic characteristic of gas can cause a remarkable dispersion phenomena; the propagation of noise can be damped, etc. In addition, the conclusion that pressure and density waves and thermal mode may be unstable agrees with the experimental fact about, thermal instability in high power laser discharges.
CRYSTAL STRUCTURE OF LiErP4O12
Authors: Liu Jian-cheng  , Li De-yu  ,   中国科学院上海硅酸盐研究所
Published: November 2020

A single-crystal X-ray diffraction analysis has been performed on LiErP4O12 Synthesized by the flux method. The crystal belongs to monoclinic system with space group C2/c, z=4, and cell parameters α=16.229?, b=7.009?, c=9.524? and β=125.92°. A full-matrix least square refinement with secondary extinction as a structure parameter gave R=0.058 for 1282 independent reflections. The basic structural units are helical ribbons, (PO3)n, formed by corner-sharing tetraheclra of PO4. The ErO8 dodecahedra are isolated from each other in the sense that they do not share any O atoms.
THEORETICAL EXPLANATION OF THE LIGHT DIFFRACTION DUE TO SPACE CHARGE FLUCTUATION IN THE QUASI ONE-DIMENSIONAL IONIC CONDUCTOR-α-LiIO3 (II)——ISOTROPIC MODES
Authors: GU SHI-JIE  , LI YIN-YUAN  ,   中国科学院物理研究所
Published: November 2020

In ref.[1] a theory has been formulated for treating the anisotropic modes (o→e) of diffraction observed in α-LiIO3 single crystals under a d. c. field. In the present article we consider the isotropic modes (o -o, e e) of diffraction observed in similar conditions with the same material. There are two kinds of diffraction bands: (1) those perpendicular to the c-axis and wide in angular extension, and (2) those inclined to the c-axis and limited in angular extension. For the former, our theoretical derivation yields the experimental findings that with the incident beam normal to the c-axis only very weak o → o and e →e bands may appear, while the o → o band remains weak but the intensity of the e → e band multiples as the angle between the incident beam and the c-axis decreases from π/2. For the latter, we took into account the grating effect of growth layers of the crystal enhanced by the enrichment of space charge. From the angular extension of an inclined band is about 8°, we estimated the deviation in parallelism between growth layers being no more than 2?and their average spacing about or larger than 5 μm. We also explained the diffraction spots reported in ref.[4]. The theory were given in a version more general than that in ref.[1].
ION RANGE PARAMETERS IN BINARY COMPOUNDS WITH POSITIVE DEVIATION FROM BRAGG RULE
Authors: WANG DE-NING  , WANG WEI-YUAN  ,   中国科学院上海冶金研究所
Published: November 2020

In this work, we investigated the ion range parameters for binary compounds having positive deviation from Bragg rule, that is the calculated Se(E) value is higher than experimental Se(E) value, By introducing a "biatomic model" with the idea of "regular", the implanted range in binary compounds was considered not only as the stopping power of ions by two alike cofposed atoms S11(E) and S22(E), but also as the stopping power of ions by two unlike composed atoms S12(E) and S21 (E). Based on Berthelot relation, let S12(E)=S21(E)=(S11(E)·S22(E))1/2, the stopping power and total range in binary compounds were derived as follows: NS(E)=1/2[(N1S11(E))1/2+(N2S22(E)1/2)]2, R=4/a[x-A1(arctg(2x+f)/△1/2-arctg(f/△1/2))-B1(ln(x+g)2/g2·e/(x2+fx+e)) -b/2 ln(x2+fx+e/e) where X=E1/2 ,E is the ion implanted energy, all the others are constants depend upon the mass and the atomic number of the ions and targets. Combined with the relationships between R and Rp, Rp and △Rp in ref. [1], we calculated the Rp and △ Rp values in systems with positive deviation. The significances of formulas given in this paper were discussed.
MOVEMENT OF SPACE SPECKLES (CONTINUED)
Authors: WU XIAO-PING  , HE SHI-PING  , LI ZHI-CHAO  ,   中国科学技术大学
Published: November 2020

In this paper, we study the space speckle motion induced by deformation of the object surface. According to the Fresnel-Kirchhoff Integration, three fundamental equations of the speckle motion induced by deformation of the surface are obtained. From these fundamental equations and those obtained in ref. [1], a general formula of the speckle motion is derived. The experimental results are in agreement with this formula. The physical explanation of these fundamental equations is presented.
A MATRIX THEORY FOR OPTICAL PASSIVE RESONATORS (IN CYLINDRICAL COORDINATES) (I)——MATRIX EQUATION OF THE SELF-CONSISTENT FIELD
Authors: LI XIAN-SHU  ,   中山大学物理系
Published: November 2020

In this paper, we discuss the matrix equation of the self-consistent field in an optical passive resonator, which was proposed in the previous paper on the basis of a matrix theory for the light propagation. A new understanding of the self-consistent field, the concept of the transform of element modes and the method of analysis of the element mode structure of the self-consistent field are presented here. It has been proved in general that the above mentioned matrix equation can be truncated into finite order so as to be solved approximately. The rigorous formula used to determine the superior limits of the errors of the eigenvalues followed from using the finite order matrix equation is given in general, and some other formulae, which are more convenient than it, are also given.It is shown that the matrix theory for optical passive resonators is very suitable for calculating modes containing the high-order modes whose diffraction losses are very close to unity. The author believe that this theory should also be suitable to analysis and design of complicated resonators.On account of the coordinates used, the theory presented here is only suited to systems with ideal axial symmetry.
AN ATTEMPT TO EMBED SUSY GUT INTO ESG
Authors: ZHANG DE-HAI  ,   北京大学物理系
Published: November 2020

This paper supposes that N=8 Extended Supergravity (ESG) can form the composite supermultiplets, and discusses the possibility of containing SU(5) Supersymme-tric Grand Unification Theory (SUSY GUT) in both composite supermultiplets {3/2,8}N=8SU(8) and {2,28}N=8SU(8) Under some harsh assumptions, it is possible to obtain 3 generations of leptons and quarks and satisfactory particle spectrum of SU (5) SUSY GUT in the {3/2,8}N=8SU(8) scheme. Under some reasonable assumptions, it is possible to obtain 5 generations of leptons and quarks (or after some modification, 4 generations) in the {2,28}N=8SU(8) scheme.
THE SUPERCONDUCTING PROPERTIES OF PbMo6S8 TAPES PREPARED BY REACTION DIFFUSION METHOD
Authors: LI HONG-CHENG  , D. G. HINKS  ,   (1)Argonne National Laboratory,Argonne,IL60439,U. S. A.; (2)中国科学院物理研究所
Published: November 2020

The process for making Chevrel-phase PbMo6S8 superconducting tapes by reaction diffusion method and the properties of the tapes are reported. Mo tape reacts with H2S to form single phase Mo-S compound (MoS2 or Mo2S3, depends on the reaction temperature), then with Pb vapor to form single phase PbMo6S8 layers. The transition temperature of the layers are 13.0-14.5 K, the widths of the transitions are in the range of 0.15-0.20 K and Jc(6T, 4.2K) ≌1.9×l08A/m2.
THE REFRACTION OF 4th SOUND BY SUPERLEAK GRAINS IN Hell
Authors: WANG BEN-REN  , WEI RONG-JUE  ,   南京大学物理系,声学研究所
Published: November 2020

From the point of view of the average compressibility and density, and based on the theory of multiple scattering, the effects of superleak grains on the propagation of the 4th sound in liquid helium Ⅱ have been dicussed. The formulas of the index of refraction both (6) and (31) are obtained. The results of numerical calculations show the role of the former is negligible but the variation of 4th sound velocity due to the multiple scattering agrees well the experimental values given in the literature.
CALCULATION OF ZERO FIELD SPLITTING PARAMETERS OF 3d5 IONS IN LOW SYMMETRY CRYSTAL FIELD
Authors: YANG GUI-LIN  , DUAN MING-QIAN  , XU YOU  , ZHAI HONG-RU  ,   (1)南京大学物理系; (2)南京大学物理系,江苏教育学院
Published: November 2020

As a natural extension of work [4], in this paper the calculation of zero field splitting parameter D of 3d5 ions in low symmetry ( C4v or D4h,C3v or D3h ) crystal field is discussed. The expressions of parameter D in terms of Racah parameters, crystal field parameters and spin-orbit coupling constant ξ are obtained. Applying to Fe3+ in α -Al2O3 crystal, the calculated result agrees fairly well with the experimental value.
GROWTH AND OPTICAL PROPERTIES OF K5Bi0.9Er0.1(MoO4)4 SINGLE CRYSTALS
Authors: LIU JIAN-CHENG  , TANG LIAN-AN  , CHEN JIA-PING  ,   中国科学院上海硅酸盐研究所
Published: November 2020

Single crystals of 5Bi0.9Er0.1(MoO4)4 were grown from stoichiometric melts by the usual Czochralski technique. The crystal belongs to trigonal system, with space group R3m , z=1.5, and cell parameters a=6.029?, c=20.823? (hexagonal setting). Due to the layered structure, the crystals exhibit easy cleavage along (0001) face. The room temperature absorption spectrum of 5Bi0.9Er0.1(MoO4)4 consists of severalbands characteristic for the rare earth ions in crystals. The spectrum is dominated by three absorption bands associated with transition from the ground 4I15/2 level of Er3+ to the 4G11/2, 2H11/2 and 4I13/2 levels, Details of room temperature emission Spectra Corresponding to the 4I13/2→4I15/2 transition are also given.
POLARONS IN A 1:3 PEIERLS SYSTEM
Authors: XING DING-YU  , GONG CHANG-DE  ,   南京大学固体物理研究所
Published: November 2020

Using the continuum limit of SSH model, we find explicitly the "polaron" soliton in one-dimensional Peierls system with commensurability-3. It is shown within the weak-coupling limit that the polaron solution satisfies exactly the self-consistent condition for the order parameter of the ionic displacements. The creation energy and characteristic width of the polaron are given. Furthermore, the possible soliton excitations in the general commensurability-M case are discussed.
KOLMOGOROV CAPACITY AND LYAPUNOV DIMENSION OF STRANGE ATTRACTORS OF FORCED BRUSSELATOR
Authors: WANG GUANG-RUI  , CHEN SHI-GANG  , HAO BAI-LIN  ,   (1)北京8009信箱; (2)中国科学院理论物理研究所; (3)中国科学院物理研究所
Published: November 2020

In this paper, by using stroboscopic sampling method which reduces the dimension of attractors, the Kolmogorov Capacity dC and Lyapunov dimension dL of some typical attractors of forced Brusselator are computed. The results show that the conjectures of ref. [6, 16] about the relations between dC and dL are correct. We spell out these conjectures as that if the maximal Lyapunov exponent λ1>0, then dC=dL; if λ1=0, then there exist examples that do not satisfy dC=dL. The reasons for noncon-vergence of dC for the forced Brusselator Caculated by using the Runge-Kutta difference equations and the way to improve it are pointed out and tested numerically. We conjecture further that by the same reason of using difference equations to approach differential equations, the capacity caculated from time series of a single observable may not be convergent.
NONPERTURBATION THEORY OF TIME-RESOLVED DEGENE-RATE FOUR-WAVE MIXING IN TWO-LEVEL SYSTEM
Authors: FU PAN-MING  , YE PEI-XIAN  ,   中国科学院物理研究所
Published: November 2020

In this paper, the time-resolved degenerate four-wave mixing in two-level system is treated rigorously with the density-matrix method. The phenomena related to the saturation effect are discussed. The physical origin of these phenomena is analysed.
THE MICROWAVE-RADIO FREQUENCY WAVE MULTI-QUANTUM TRANSITION IN OPTICAL PUMPING EXPERIMENT
Authors: LIU SHU-QIN  , DONG TAI-QIAN  ,   北京大学
Published: November 2020

In the optical pumping experiment for 87Rb gas cell, when the microwave and radio frequency wave are applied simultaneously, the optically detected resonance signals of microwave-radio frequency wave multi-quantum transition are observed.
TRANSITION FROM QUASIPERIODIC REGIME TO CHAOS IN THE FORCED BRUSSELATOR
Authors: WANG GUANG-RUI  , HAO BAI-LIN  ,   (1)北京8009信箱; (2)中国科学院理论物理研究所
Published: November 2020

We have observed transitions from quasiperiodic regime to chaos in the periodically forced Brusselator. It takes place via kinking and folding of the originally smooth Poincare map which may be more generic as compared to the transition in circle mapping, where the quasiperiodic orbit looses smoothness globally. Now all the well-known "routes" to chaos have been shown to coexist in this mathematical model in different part of the parameter space. This is in agreement with experimental observations in some hydrodynamical systems where different routes to turbulence have been found in one and the same system under slightly different conditions.
THE IMAGE FORCE ON THE DISLOCATION NEAR A CRACK TIP
Authors: LONG QI-WEI  , WANG LI  ,   中国科学院金属研究所
Published: November 2020

The image force on the dislocation near an elliptical hole is calculated by confor-mal mapping technique. Allowing one axis of the ellipse to dwindle to zero, the crack limit solution is obtained.
EMPIRICALLY ADJUSTED ZONE-VARIATIONAL METHOD FOR BAND CALCULATIONS
Authors: XUE FANG-SHI  ,   南京固体器件研究所
Published: November 2020

An empirically adjusted zone-variational method for energy band calculations is presented in this paper. The potential outside the sphere is adjusted empirically to make the resulted energy band closer to experimental results. This method has been used to compute the energy bands of Si and Ge. The results agree with the experimental ones very well. In accordance with the special feature of using differen methods to solve the Schrodinger equation in different potential regions, a new computational model for alloy band is also suggested. By using the same adjusting parameters, the energy band of Si-Ge alloy is computed, which is superior to the OPW result. Thus it can be seen that the zone-variational method is an effective and prospective computational method in band theory and has considerable wide application.
THE CRYSTAL STRUCTURE ANALYSIS OF KLiSO4 WITH NEUTRON DEFFRACTION AT ROOM TEMPERATURE
Authors: YAN QI-WEI  ,   中国科学院物理研究所
Published: November 2020

The crystal structure of KLiSO4 has been determined by neutron deffraction at room temperature. The position z/c of Li atom is in agreement (the difference is smaller than 1%) with previous X-ray study.
A STUDY OF HIGHLY IONIZED ARGON SPECTRUM IN THE VACUUM ULTRAVIOLET REGION
Authors: JIANG DE-YE  , SHEN LI-KANG  , ZHAO LI-ZENG  , WANG WEN-SHU  ,   中国科学院物理研究所
Published: November 2020

The highly ionized Argon spectrum in the vacuum ultraviolet region from 2000? to 194? is reported. A lot of new spectral lines are observed. Among them, 64 new spectral lines are identified, the new energy levels are found as follows: ArIV 3s23p2(3P)3d2F5/2,7/2, ArIV 3s23p2(1D)3d2S1/2, ArV3s23p3d1D2 and ArVI3p32)P1/2,3/2. Nine energy level values of ArIV3s23p2(3P)3d2P1/2,3/2,ArIV3s23p2(1D)3d2P1/2,3/2,ArIV 3s23p2(1D)3d2D3/2,5/2,ArIV 3s23p2(1D)4s2D3/2,5/2 and ArV 3s23p3d1P1 are revised.
ACOUSTIC EMISSION IN Nb-Ti SUPERCONDUCTORS
Authors: JIAO ZHENG-KUAN  , CHEN ZHUO-MIN  , DING LI-REN  , WANG EN-YUE  , WANG QIAN  , ZHENG ZHI-QIN  ,   (1)中国科学院等离子体物理研究所; (2)中国西南物理研究所
Published: November 2020

In this paper, we present experimental results of acoustic emission in bare Nb-Ti single core superconductor and multifilamentary superconducting composite, which have undergone different excitation procedure in Si-rubber potted and dry modes.We have found that AE signals are chiefly generated by conductor motion or flux-ju-inping, but not by flux motion. The starting driving force for motion in Si-rubber potted sample is an order of magnitude higher than that in dry sample.Acoustic emission technique is a possible means for monitoring magnet quench as conductor goes through a series of microslip (or incomplete flux jump) before macromotion.
AN INVESTIGATION OF LASER INDUCED THERMAL GRATING IN LIQUID CRYSTAL
Authors: ZHU HUA-NAN  , MI XIN  , YU ZU-HE  , JIN FU-HUI  , FU PAN-MING  ,   中国科学院物理研究所
Published: November 2020

Degenerate four-wave mixing effect due to thermally induced index grating is studied in liquid crystal MBBA. By measuring the relaxation time of the thermal grating decay, we obtain the diffusion coefficient of MBBA in its isotropic phase, i.e., D=8.6×10-4cm·S-1 at T = 45.1℃.
THE STEP STRUCTURE EFFECT OF DC JOSEPHSON CURRENT WITHIN ONE FLUX QUANTUM PERIOD (Ⅰ)——SQUID CONSISTING OF TWO JUNCTIONS
Authors: ZHANG YU-HENG  , LI YU-ZHI  , ZHENG JIE-FEI  ,   (1)中国科学技术大学,82届毕业生,中国科学院半导体研究所; (2)中国科学技术大学物理系
Published: November 2020

If a SQUID consisting of two junctions is placed in a cavity with sufficiently high Q-value, when the Josephson frequency of the junction ω=2eV0/h equals to one of the ei-gen frequencies ωr of the cavity, then the oscillating electromagnetic field in the form of standing wave excited by the junction current would react on the junctions and produce a series of steps of dc Josephson current within one flux quantum period Φ0. The theory also predicts that a series of new superconducting quantum interference phe-nomenons would be produced by Josephson currents of two junctions in the feed back field. The step height of the Josephson current will be inreased when both junctions are placed separately at the peak of the standing wave. The phase of the interference trace of SQUID will change by π/2 when one of the junctions is placed at the peak and the other is placed at the trough. The I-H trace of SQUID will degenerate to that of signle junction when one of the junctions is placed at the pack and the other is placed at the node. The step will not occur except that with n=0 yhen both junctions are placed separately at nodes.
FURTHER STUDIES ON THE PHASE TRANSITION OF LITHIUM IODATE (LiIO3) POLYMORPHISM
Authors: LIANG JING-KUI  , ZHANG YU-MING  ,   中国科学院物理研究所
Published: November 2020

Further studies on the phase transition mechanism of LiIO3 at normal pressure have been made by means of DTA, heat-treatment, and powder X-ray diffraction. There are three phases of LiIO3, β,η,δ, existing relatively stably at high temperatures and they can directly melt respectively. Their melting points are as follows: phase β, 432℃; phase η, 421℃; phase δ, 416℃. The melting points, thermal processes and the exiting temperature ranges ail show that the order of their thermodynamical stability is: β>η>δ. In dry air and at room temperature, the phase ζ of LiIO3, which changes to phase β when it is heated to 335℃ at 10℃/min, stands long periods of time without any change as well as phase α and β . In the existing temperature range of α -LiIO3, phase ζ does not transform into phase α although it is heat-treated for a long time. The temperature of phase transition of ζ to β is higher than that of α to β. The existence of phase β in the phase ζ has a promotive effect on the phase transition of ζ to β just as the case of α to β. The existence of phase ζ in the phase α has also a promotive effect on α to β . The phase θ, like the phase γ. is also an intermediate metastable phase in the phase transition processes of LiIO3.
M?SSBAUER STUDIES OF THE METALLIC IRON POWDERS USED AS HIGH DENSITY MAGNETIC RECORDING MATERIAL
Authors: SUN KE  , FENG YUAN-BING  , LUO HE-LIE  , LI SHI  , SHAO HAN-RU  ,   (1)中国科学院高能物理研究所; (2)中国科学院物理研究所
Published: November 2020

Recently the metallic magnetic powders have been recognized to be better materials for high density magnetic recording. Superior quality magnetic tapes have been made with these metallic powders. But there are some problems remined they are easily corrodible and are rather difficult to disperse in the lacquer. To study the causes of chemical instability of these materials and to prevent their corrosion are very important for their applications in practice. The causes of chemical instability of metallic powders are studied by M?ssbauer effect and other experimental methods. Their corrosion may be prevented basically. This study will provide some useful data for their practical applications.
A KIND OF SINGULAR PERTURBATION METHOD FOR SOLVING THE BOLTZMANN EQUATION WITH SMALL KNUDSEN NUMBER
Authors: DING E-JIANG  , HUANG ZU-QIA  ,   北京师范大学低能核物理研究所
Published: November 2020

A kind of singular perturbation method is used to remove secular terms in Hilbert expansion and Enskog expansion of the normal solution and those in Grad expansion of the "initial layer" solution of Boltzmann equation (B.e.). The problem of solving B.e. in the "boundary layer" is reduced to that of solving a set of linear algebraic equations.
QUANTITATIVE EDS ANALYSIS OF THE CONSTITUENTS OF BINARY COMPOUNDS WITHOUT STANDARD SAMPLES
Authors: WAN DE-RUI  , FENG JIAN-QING  , ZENG JIA-YU  , LIU XAO-GUANG  , ZHONG YUAN-QING  ,   四川大学
Published: November 2020

Russ's method is usually used in the no-standards quantitative analysis of X-ray EDS. Recently Wu et al. put forward a direct no-standards quantitative analysis method. The direct no-standards quantitative analysis method is also used in this article. However we utilized the advantages of Russ's method in which the physical model in normal ZAF correction is used. The method developed by us is easy for calculation. The analytical value of the NaCl, NaI, KCl, ZnS, AgI, GaAs are better than that of Russ's method. Especially the values of the samples which contain the elements of lower atomic number are more apparent.
ON THE NONLINEAR FIELD-EFFECT OF ORTHORHOM-BIC TaS3
Authors: ZHANG DIAN-LIN  ,   中国科学院物理研究所
Published: November 2020

The true dc measurement of electrical field effect on the resistivity of orthorhombic TaS3 in the CDW state was performed for the first time with extremely short distances between the contacting leads. Very weak nonlinear effect was observed up to 1300 V/cm. A distinct resistivity-increasing effect was found, which can not be understood within the framework of any currently available theories. We propose a transverse tunneling model to account for this anomaly.
STUDY OF ELECTRICAL PROPERTIES OF POLY (ETHLENE OXIDE )-NaSCN POLYMER IONIC CONDUCTOR
Authors: WANG CHAO-YING  , CHEN LI-QUAN  , CHEN ZHU-SHENG  , HE YUAN-KANG  ,   (1)北京大学化学系; (2)中国科学院物理研究所
Published: November 2020

The conductivities of three PEO-NaSCN samples whose molecular weight are 6000, 12000 and 20000 respectively have been studied as a function of temperature during two thermal cycles. It was found that the completeness of complex reaction in the samples had a obvious effect on the electrical behaviours. The complex reaction in molecular weight 12000 sample was complete, therefore the electrical property was not influenced by thermal history. While this reaction in the other two samples did not fully complete and can occure in certain temperature range during the first heating process, thus rather complicated log σ versus 1/T curves were observed. It was noted that the extra PEO content in the samples had a remarkable influence on the electrical property. Molecular weight 12000 sample contains more extra PEO content than the others. Therefore it has the highest conductivity and the logσ versus 1/T curve consists of two straight lines with a discontinuity at temperature near the melting point of pure PEO. While the extra PEO content in molecular weight 6000 sample is much less, it is responsible for the lowest conductivity and continual change of conductivity with temperature.
STRUCTURE STUDY OF Co81.5 B18.5, METALLIC GLASS
Authors: WU GUO-AN  , N. COWLAM  ,   (1)Department Of Physics,University Of Sheffield,U. K.; (2)西南反应堆工程研究设计院
Published: November 2020

X-ray diffraction and polarized neutron diffraction measurements have been made on metallic glass Co81.5 B18.5. The partial structure factors, Sij(Q), and partial reduced RDF, Gij(r), are obtained by applying two different data analysing procedures, these results are compared in conjunction with the experiment done by other workers. The neutron scattering intensity of a simple model has been simulated, and the structure model of this glass is finally discussed.
THE EXACT SOLUTION OF RELAXATION PROCESS OF AN OSCILLATOR IN A THERMO-BATH
Authors: HU GANG  , A. GRECOS  ,   (1)Chimie-Physique II,Universite Libre de Bruxelles,Belgium; (2)北京师范大学物理系
Published: November 2020

Starting from the Von Neumanm equation, the exact solution of the transition probability of an oscillator coupled with a thermo-bath is obtained, without the weak coupling approximation. The equilibrium distribution for the oscillator is given expli-citely as well.
AN ELECTRON MASER INSTABILITY
Authors: XU MlN-JIAN  , WU JING-SHENG  ,   (1)美国马里兰大学物理科学和技术研究所; (2)中国科学院物理研究所
Published: November 2020

The electron cyclotron maser instability is analyzed for the following case, in which a relativistic monoenergetic electron beam is injected into a background plasma, but the beam direction is initially oblique to the ambient magnetic field. We consider that the electron plasma frequency is comparable to the electron cyclotron frequency associated with the external magnetic field and study the situation: (1) the background plasma density n0 is much larger than that of the suprathermal electron ns and (2) n0s. The relativistic effects destablized the o and x mode with frequencies respectively in the vicinity of the fundamental and the second harmonic of the electron cyclotron frequencies. The growth rates of both modes are computed and discussed.
M?SSBAUER STUDY OF MAGNETIC STPUCTURE IN LITHIUM-ZINC FERRITES
Authors: YANG XIE-LONG  , GU YUAN-JI  , TANG HUAN  , HE RUI-YUN  , HE PI-MO  ,   (1)华东师范大学物理系; (2)西南应用磁学研究所
Published: November 2020

The M?ssbauer spectra of the ferrite system, Li(0.5(1-x))ZnxFe(2.5-0.5x)O4, were studied at 77 K, 195 K and room temperature in an external magnetic field parallel to the gamma-ray direction. With increasing x and decreasing temperature, the second and the fifth lines of the six magnetic splittings were observed to become clearer, which proves convincingly the existence of canting of the moment of Fe3+ populated in the (B)-sublattice of the LiZn-ferrites. The agreement between magnetizations calculated on the basis of M?ssbauer parameters and measured by the magnetic experiment is satis-factory.
DYNAMICAL BEHAVIOR OF RF-BIASED JOSEPHSON JUNCTIONS (Ⅰ)
Authors: WANG ZI-DAN  , YAO XI-XIAN  ,   南京大学物理系
Published: November 2020

A lot of numerical investigation of equations of rf-biased Josephson junctions is carried out, in which the interference term is included in current-phase relation. Chaotic behavior, sequence of period-doubling bifurcations, inverse sequence of chaotic band and intermittent chaos are found seperately in various parameter regions. The convergent factor δ n of 2n Psequence and the ratio Φ(k)/Φ(k+1) are calculated, where Φ(k) is the average height of the peaks corresponding to 2kP in the power spectrum. We also study the symmetry possessed by period solutions and its relation to the nature of approach to chaos
AN EXPERIMENTAL METHOD OF MEASURING THE CRYSTALLIZATION FRONT TEMPERATURE
Authors: JIN WEI-QING  , HIROSHI KOMATSU  ,   (1)日本国东北大学金属材料研究所; (2)中国科学院上海硅酸盐研究所
Published: November 2020

In studying the kinetics of crystal growth from the melt, it is extremely important to measure the crystallization front temperature. In order to carry out in situ observations of growth around room-temperature, a thermally regulating stage on polarized-light microscope was constructed. The temperature at the crystallization front of salol was measured by a c.c, thermocouple with diameter 25 μm. The results of measurement showed that using present apparatus, the rate of latent heat removal was constant in a supercooling stationary melt in the range of △T<3.0℃. The increament of temperature at the front was about 1% of the supercooling in the melt bulk.The thermally regulating stage we designed can be useful in the study of the kina-tics of crystal growth.
INVERSION OF p-TYPE SILICON TO n-TYPE BY PULSED LASER IRRADIATION
Authors: YAO JIE  , CHEN BAO-QIONG  , WANG HONG-KAI  ,   (1)电子工业部46所; (2)中山大学物理系
Published: November 2020

This paper describes an effect of the inversion of silicon single crystal from p-type to n-type by the irradiation of ruby pulsed laser. This effect is a function of the impurity compensation but independent of the oxygen content, the crystal cut and the crystal-growing process. Experimental results show that p-type silicon crystals with phosphorus impurity compensation higher than 7% are susceptible to inversion by pulsed laser irradiation when the amount of impurity compensation increases and the distribution of impurity compensation changes. The concentration profile of phosphorus atoms is given by SIMA technique.
ON THE CONFORMAL ANOMALY FOR PURE GRAVITY
Authors: GUO HAN-YING  , WU KE  ,   中国科学院理论物理研究所
Published: November 2020

Based upon the geometrical and topological method, the conformal anomaly for pure gravity in a curved space-time is discussed, and a new expression αεabcdΩabΛΩcd+βεabcdHabΛHcd of the conformal anomaly for pure gravity is obtained, where α, βare two arbitrary constants,Ωab and Hab are Riemann curvature 2-form and eonformal invariant curvature 2-form respectively introduced by Thomas. In the expression the first term is proportional to Euler class, the second term contains not only the ordinary Weyl tensor square but also the other conformal invariants.
OPTICAL BISTABILITY OF InSb
Authors: CHENG RUI-HUA  , LUAN SHAO-JIN  , SHEN HONG-WEI  , TAN WEI-HAN  ,   中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, the measurement on optical bistability and non-linear trasmission of InSb at 12 K is described and an analysis based on theory of optical bistability of Fabry-Perot cavity is given.
RAMAN SPECTRUM OF PYRIDINE AT HIGH PRESSURES
Authors: JIA WEI-YI  , SHANG YU-SHENG  , TANG RU-MING  , YAO ZHEN-YI  , WANG YAN-YUN  , LIU JING-QING  , HE SHOU-AN  ,   中国科学院物理研究所
Published: November 2020

Raman spectrum of pyridine has been investigated at high hydrostatic pressure, the pressure behavior of the vibration modes below and above phase transitions has been studied. A kind of crystalline-plastic phase transition was observed near 60 kbar. A satellite peak at the high frequency side of the ring breathing mode 992cm-1 was detected, which shifted more rapidly to ward high frequency with pressure. It is supposed to be the ring breathing mode of adsorbed (interface) molecules on the surface of ruby particles which was used for pressure calibration. The satellite is extremely enhanced, possibly by a mechanism of Mie structure resonance scattering.
ULTRASONIC ATTENUATION IN STEEL DURING FATIGUE
Authors: PAN ZHENG-LIANG  , WANG SHUANG-QUAN  , LI GUANG-YI  ,   中国科学院金属研究所
Published: November 2020

The fatigue crack length a and the changes of ultrasonic attenuation △α at frequency 10 MHz 011 compact test sample of 30CrMnSiNi2A steel have been simutane-uosly measured as a function of fatigue cycle number N. It was shown that the △α(N) curve was in good response to the a(N) curve and the △α was traced out during the period of crack nucleation. The ultrasonic attenuation a as a function of load P in pulsating tension fatigue test has been investigated. When Pc, where Pc is a critical load, a decreases wth increase of the load; when P>Pc, a increases rapidly with increase of the load. A depinning model of dislocations is suggested. The ultrasonic attenuation is a very useful tool for studying the growth of fatigue crack.
THE TRANSITIONS OF Fe2+-Fe3+ PAIRS IN TOURMALINE
Authors: SHEN GUO-YIN  , WAN KE-NIN  , SHANG BO  ,   四川师范学院固体物理研究室
Published: November 2020

Crystal field theory has been used to calculate the spin allowed transition of Fe2+ ions with 3d6 configuration in the two substitutional sites of interest in tourmaline, i. e., in b and c-sites which have Cs and C1 point group respectively, by using Zhao's SCP d-orbit of Fe2+ ion. The transition of Fe2+-Fe3+ ion pairs, (Fe2+[g]-Fe3+)→(Fe2+[e]-Fe3+) which has not previously been studied, is discussed here theoretically. An estimate of the magnitude of the intensity of the three strongly polarized (E⊥c>>E//c) bands near 9,000cm-1,13,800cm-1,15,000cm-1 in the near-infrared region is given. The interpretation of the near-infrared absorption spectra of tourmaline is satisfactory.
THE EFFECT OF AN INJECTION SIGNAL ON THE FREE-ELECTRON-LASER
Authors: FANG HONG-LIE  , G. T. MOORE  , M. O. SCULLY  ,   (1)Institute for Modern Optics,Phys.Dept.Univ.of NM,Albuguergue,New Mexico,U.S.A.; (2)中国科学院上海光学精密机械研究所
Published: November 2020

In this paper, the effects of an injection signal on the Free-Electron-Laser are investigated. And the reason of and the method for suppressing the break-up of the optical pulses in a Free-Electron-Laser are found.
ON THE SINGULAR PERTURBATION SOLUTION OF BOLTZMANN EQUATION (Ⅳ)——EXTENSION TO NON-MAXWELL MOLECULES
Authors: DING E-JIANG  , HUANG ZU-QIA  ,   北京师范大学低能核物理研究所
Published: November 2020

The singular perturbation method used in [1-3] is extended to discuss the solution of Boltzmann equation with small Knudson number for non-Maxwell molecules. It is shown that the method set up in [1-3] and the main conclusions obtained for Maxwell molecules still hold for non-Maxwell molecules under rather general conditions.
THRESHOLD AND ENERGY TRANSFER EFFICIENCY IN HIGH PRESSURE HYDROGEN SRS
Authors: GUO YI-LI  , DING HAI-SHU  , YAO MIN-YAN  , LOU CAI-YUN  , LI GANG  , ZHOU SHOU-HUAN  ,   (1)华北光电技术研究所; (2)清华大学
Published: November 2020

In this work, the influences of several parameters (molecular density of medium, transition linewidth, photon density of pump laser and nonlinear interaction length) on high pressure H2 stimulated Raman scattering (SRS) threshold and energy transfer efficiency are investigated. The experiments were carried out on a Q(1) line vibration transition (4155 cm-1) SRS. Results of effect of H2 pressure (0 to 24 atm) on the threshold are coincident with the analysis of the combined effect of Dicke-Doppler and collision broadening. The influences of stimulated Raman process (SRP) and four-wave parametric processes (FWPP) on energy transfer efficiency, as well as the role of pressure-dispersion effect on higher order anti-Stokes are also discussed.
EFFECTS OF RESISTIVE INTERCHANGE INSTABILITIES ON ENERGY CONFINEMENT IN REVERSED-FIELD PINCH
Authors: AN ZHI-GANG  , P. H. Diamond  ,   (1)Institute for Fusion Studies,University of Texas Austin,Texas 78712,U. S. A.; (2)中国西南物理研究所
Published: November 2020

Electron conduction losses due to magnetic flutter produced by resistive interchange instabilities and the resulted confinement deterioration mechanism are investigated analytically. Using approximate solutions of MHD equations for even and odd potential parities, the potential and magnetic perturbation levels at saturation are estimated. These results are used to calculate the stochastic magnetic field diffusion coefficients. An expression for the anomalous electron thermal conductivity is then derived for collision-less and collisional regimes. Scaling laws for energy confinement are infered therefrom.
THE LINE SHAPE ANALYSIS FOR Si L2,3 VV AUGER SPECTRA OF CLEAVED Si (111) SURFACES WITH OXYGEN ADSORBED
Authors: XU ZHI-ZHONG  , DAI  DAO-XUAN  , ZOU HUI-LIANG  ,   (1)复旦大学现代物理研究所; (2)上海计量局测试技术研究所
Published: November 2020

By digital integration, background subtraction and self-deconvolution for SiL2,3VV Auger spectra measured on the cleaved clean Si (111) surface and that with oxygen adsorbed, the partial transition densities of state of clean surface and adsorbed surface are obtained. With reference to other experimental and theoretical results, it could be inferred from these partail transition densities of state that oxygen is adsorbed both in a molecular state and in an atomic state, and in the adsorbed stage the oxide may also be formed.
DISLOCATIONS IN POTASSIUM DIHYDROGEN PHOSPHATE (KDP) CRYSTALS
Authors: CHEN JIN-CHANG  , HUANG YI-SEN  , WEI PEI-ZAI  ,   中国科学院福建物质结构研究所
Published: November 2020

Etch pits on (100) and (001) surface of KDP crystals have been revealed by chemical etchant and optical observations. Based on the distribution and morphology as well as the type of dislocations and other defects on KDP crystals of different qualities, a brief discussion on the formation of the dislocations is given.
INVESTIGATION OF“NEGATIVE PEAK”IN EXAFS MEASUREMENT
Authors: HAN FU-SEN  , LU KUN-QUAN  , CHANG LONG-CUN  ,   中国科学院物理研究所
Published: November 2020

The EXAFS measurement needs to disperse the incident X-ray beam with monochro-mating crystal. Beside the. continuous and some characteristic spectrum from nonsynch-rotron radiation, "negative peak" sometimes occur. It will distort the signal desired. This paper reports the detailed investigation of the "negative peak" and the interpretation with X-ray multiple diffraction. Fially, the method to avoid it is discussed.
FAR-INFRARED REFLECTION SPECTRA AND THE MULTIMODE MODEL FOR MIXED CRYSTAL CdxHg1-xTe
Authors: SHEN XUE-CHU  , CHU JUN-HAO  ,   中国科学院上海技术物理研究所
Published: November 2020

Far-infrared reflection spectra in the wavenumber region between 15 to 500 cm-1 are obtained and studied for the mixed crystals CdxHg1-xTe with different compositions from 0.18 to 0.45 at the temperatures between 4.2 to 300 K. In addition to the fine structures of the CdTe-like optical phonon reflection band, the complex structure of the HgTe-like band for the low composition sample has been observed, and the dependences of the spectral structures on the composition and the temperature of the samples have also been investigated. The fine structures of the reflection spectra are explained based on the multimode quasi-harmonic oscillator model.By means of the classical oscillator matching method, the curve-fitting calculations are performed for the experimental reflection spectra, and the dielectric function spectra and other optical constants versus frequencies are obtained from a satisfactory fitting.
BIFURCATION, CHAOS AND TRANSIENT BEHAVIOR IN LIQUID CRYSTAL HYBRID OPTICAL BISTABLE DEVICES
Authors: WANG PENG-YE  , DAI JIAN-HUA  , ZHANG HONG-JUN  ,   中国科学院物理研究所
Published: November 2020

Bifurcation and chaos behavior in liquid crystal hybrid optical bistable devices is calculated and analysed based on the relaxation equation with time-delayed feedback. We also find that there is a transient oscillation with period ta within the bistable region.
THEORETICAL CALCULATION OF PULSED ACTIVE-PASSIVE MODE-LOCKED SOLID-STATE LASERS (Ⅱ)——COMPUTER SIMULATION
Authors: ZHU ZHEN-HE  ,   中国科学院物理研究所
Published: November 2020

Computer simulations are carried out with the theoretical model presented in the previous paper for pulsed active-passive mode-locked Nd-glass and Nd : YAG lasers. The dependences of some characters of active-passive mode-locked lasers, such as mode-locking threshold, output stability, pulse width, pulse asymmetry, on modulation depth and detuning of the active modulator, concentration and relaxation time of the satura-ble dye, are given by the simulation calculations. The theoretical results are qualitatively in good agreement with experiments. Some experimental observations are explained. Thereby the physical processes involved in active-passive mode-locking are understood more deeply.
A MODEL OF QUASI-PARTICLE EXCITATION BY DISORDER CONFIGURATION FOR THE LOW TEMPERATURE ELECTRONIC RESISTIVITY IN METALLIC GLASS
Authors: CAO ZHONG-SHENG  , LIU FU-SUI  , ZHAO ZHONG-XIAN  ,   (1)北京大学物理系; (2)中国科学院物理研究所
Published: November 2020

Based upon Kubo 's linear response theory, we propose a simple quasi-particle exita-tion model of low temperature anomalous resistivity in highly disordered metallic systems.In our model, the Fermi level is deformed as a result of configurational disorder.
THE ORDERED STRUCTURE FORMED ON Mo (001) AND Mo(110) SURFACES BY BOMBARDMENT OF NITROGEN IONS
Authors: FAN YONG-NIAN  ,   中国科学院金属研究所
Published: November 2020

After bombarding the Mo (001) and Mo (110) surfaces contained trace amount of carbon and oxygen with nitrogen ions of the energy of 1 keV and the beam current of 6 μA for 10-15 min, a very strong Auger pcak of nitrogen appeared in AES.The LBED observation showed that surface structure was disordered from room temperature to 350℃ annealing. When the sample was heated to the temperature range530-650℃, three types of LEED pattern, i. e.,c(2×2)-N, p(2×2)-N and (4(21/2)×21/2 R45°-N, O formed on Mo(001). In the case of Mo (110) only one type LEED pattern of c(7×3)-N was observed.The fact that the LEED structure of surface related to thermal desorption indicates that ordered structure depends on coverage of notrogen and temperature, and provi--des some information about phase transformation on the surface.
THE PEAK EFFECT OF THE Pb-40wt% In ALLOYS IN A LONGITUDINAL MAGNETIC FIELD
Authors: JIA YUN-FA  , WANG JUN-YI  ,   中国科学技术大学物理系
Published: November 2020

The peak effect of the Pb-40 wt% In alloy specimen in a longitudinal magnetic field is observed. The critical thickness d0 is estimated.
THE MAGNET OCRYSTALLINE AN1SOTROPY OF W-TYPE HEXAGONAL FERR1TES
Authors: XU YOU  , YANG GUI-LIN  , CAI HENG  , ZHAI HONG-RU  ,   南京大学物理系
Published: November 2020

Single ion anisotropy of Fe3+ ions at each site of the 7 sublattices (2d, 4e 4fⅣ,4fⅥ, 6g, 12k and 4f) in the hexagonal ferrite Zn2-W has been calculated by crystal field theory using point charge model. As expected, the results show that the contributions of diffrent sites are different and may be either positive or negative, thus the experimental results of substituted W-type ferrites can be explained.