Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel

1993 Vol. 7, No. 2

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Electron Transport in the Systems La2CuO4+ and La2-xSrxCuO4
ZHOU Jian-Shi, Chan J, Goodenough J B
1993, 7(2): 81-91 . doi: 10.11858/gywlxb.1993.02.001
PDF (883)
Abstract:
The temperature dependence of the resistivity and Seebeck coefficient for the two p-type systems La2CuO4+ (00.09) and La2-xSrxCuO4 (0x0.3) are interpreted.
Influence of Cr-Content on both Resistivity and Its Pressure Effect in Amorphous Fe-Zr Base Alloys
SU Fang, SU Jun, XU Wei
1993, 7(2): 92-99 . doi: 10.11858/gywlxb.1993.02.002
PDF (881)
Abstract:
The resistivity of amorphous Fe90-xCrxZr10 (x=2, 4, 7, 10, 13, 16, 20) alloys was measured in detail by a 4-probe dc technique under different hydrostatic pressure from 0.000 1 GPa to 2.5 GPa. It is observed that: (1) The resistivity 0 at room temperature and atmosphere pressure varies in a manner s...
Effects of Pressure on the Crystallization Temperature and Activation Energy of Metallic Glass Zr70Cu30
SHEN De-Jiu, SHEN Zhong-Yi, WU Hao-Quan, YIN Xiu-Jun
1993, 7(2): 100-104 . doi: 10.11858/gywlxb.1993.02.003
PDF (672)
Abstract:
The crystallization temperature and activation energy of metallic glass Zr70Cu30 were studied in the pressure range up to 2 GPa by resistance measurement. In addition, the relation between the crystallization temperature and activation energy was discussed.
Formation of the Spherical-Like Recrystallized Graphite
HAO Zho-Yin, HE Yi-Xing, CHEN Yu-Fei, WANG De-Rong
1993, 7(2): 105-109 . doi: 10.11858/gywlxb.1993.02.004
PDF (655)
Abstract:
We have observed the change of recrystallized graphite morphology using a high-resolution electron microscope, and have found evidence of the diamond crystal-formation.
Pressure and Temperature-Induced Soft Mode Phase Transition in Bi1.8Nd0.2Ti4O11
CUI Qi-Liang, MENG Jin-Fang, ZOU Guang-Tian, ZHAO Yong-Nian, LI Dong-Mei
1993, 7(2): 110-114 . doi: 10.11858/gywlxb.1993.02.005
PDF (615)
Abstract:
The Raman spectra of Bi1.8Nd0.2Ti4O11 have been measured by backward scattering. Experimental results show that the phase transition pressure and temperature are 3.35 GPa and 200 ℃, respectively. The cause of the shift in the phase transition point and the variation of the high frequency phonon mode...
The Critical Properties of Liquid-Gas for 2024Al
ZHANG Chun-Bin, GUO Quan-Lin, LI Mao-Sheng
1993, 7(2): 115-122 . doi: 10.11858/gywlxb.1993.02.006
PDF (655)
Abstract:
The critical properties of EOS with cold pressure in the form A(B-2) for 2024Al were studied here. Two modified forms of cold pressure of Morse potentials are presented and the critical parameters are calculated. We believe that the modified cold pressure forms are more reasonable than the early for...
The Structure Phase Transition of Iodine at High Pressure
CEHN Liang-Chen, ZHANG Zhi-Ting, CHE Rong-Zheng, YU Ting-Nan, LI Feng-Ying, GU Hui-Cheng, XU Li-Wen, WANG Ji-Fang
1993, 7(2): 123-126 . doi: 10.11858/gywlxb.1993.02.007
PDF (788)
Abstract:
The structure phase transitions of iodine have been studied by using X-ray diffraction with a diamond anvil cell at high pressure up to 32 GPa. As iodine is reactive with iron in air, a corrosion-resisting and high-strength gasket was put between the diamonds, thus the sample can be mounted at atmos...
The Relation between Fractal Dimensionality and Entropy
QU Shi-Xian, DONG Lian-Ke
1993, 7(2): 127-131 . doi: 10.11858/gywlxb.1993.02.008
PDF (714)
Abstract:
The relation between fractal dimensionality and entropy was demonstrated theoretically in the paper, in which the fractal dimensionality is a measure of the entropy and a state function. This is the physical meaning of fractal dimensionality. The relation between the configuration (information) entr...
The Structure and Formation of Al0.77Mn0.19Yb0.04 Quasi-crystal by Quenching Technique under Static High Pressure
XU Da-Peng, SU Xin-Tang, YU Ri-Cheng, SU Wen-Hui, XING Zhi-Ming
1993, 7(2): 132-137 . doi: 10.11858/gywlxb.1993.02.009
PDF (759)
Abstract:
The T-phase quasi-crystal containing rare earth element of Al0.77Mn0.19Yb0.04 alloy has been obtained by the quenching (100 ℃/s) technique at fusion state (1 300 ℃) under static high pressure (4.2 GPa). The symmetry pattern of the quasi-crystal structure was observed and analyzed by selected area tr...
The Sound Velocity and the Attenuation of YIG and YAG Crystal under Pressure with and without an External Magnetic Field
GU Hui-Cheng, LI Feng-Ying
1993, 7(2): 138-142 . doi: 10.11858/gywlxb.1993.02.010
PDF (807)
Abstract:
YAG is a nonmagnetic garnet crystal and YIG is a ferromagnetic garnet crystal. The sound velocity and the attenuation of the ferromagnetic garnet and nonmagnetic garnet were studied at high pressures with or without an external magnetic field. The sound velocity was measured by Pulse echo overlap te...
The Technology for the Separation of Projectile from Its Seat in Hypervelocity Impact Study
WANG Jin-Gui
1993, 7(2): 143-147 . doi: 10.11858/gywlxb.1993.02.011
PDF (874)
Abstract:
This paper describes in detail the technology used in the separation of projectile from its seat in the hypervelocity impact study on the two-stage light gas gun. The results show that this technology which uses an interceptor to separate the seat from the projectile won't cause the loss of the proj...
A New Concept on the Structure of the Catalyst in Diamond Synthesis
SUN Jiang, LI Ji-Fa, FENG Qing-Tian
1993, 7(2): 148-151 . doi: 10.11858/gywlxb.1993.02.012
PDF (909)
Abstract:
The circular sheet catalyst has been found useful for both six anvil and two anvil high pressure devices. But the single-output of the latter is about 50% higher than the former for the same chamber dimentions. In this paper, we analyzed the catalyst's surface characteristic and the relationship bet...
Numerical Calculation for Latent Heat and Thermal Expansion Coefficient of a Two Dimensional Hard Disk System
ZHAO Min, SUN Feng-Guo, TANG Rong-Qi
1993, 7(2): 152-155 . doi: 10.11858/gywlxb.1993.02.013
PDF (852)
Abstract:
Using numerical method of reference [6] , we calculated the latent heat and thermal expansion coefficient of a two dimensional hard disk system.
Study of Surface Morphology of Diamond Thin Films on Mo Substrates
YANG Guo-Wei, MAO You-De
1993, 7(2): 156-160 . doi: 10.11858/gywlxb.1993.02.014
PDF (683)
Abstract:
Diamond thin films have been deposited by the hot filament CVD method on molybdenum substrates from the mixture reactant gas of acetone and hydrogen. The surface morphology of the obtained diamond films under various deposition conditions, i. e. , different reaction pressures, was observed by scanni...

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