高压物理学报

The Effect of Pressure Transmitting Medium on the High Pressure Experiments in Diamond Anvil Cell (DAC): Experimental Measurement of the Equation of State (EOS) of Pyrope

XU Ji-An

1987, 1(2): 97-101 . doi: 10.11858/gywlxb.1987.02.001

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Abstract:
The EOS data of pyrope in high pressure region measured in DAC technique by using Ar as pressure transmitting medium has been found to be different from that obtained by using methyl and ethyl alcohol mixture as pressure transmitting medium. It follows that in case of measuring the EOS data of mater...

Lattice Parameters of the Perovskite in Aluminum-Bearing Silicates

WENG Ke-Nan

1987, 1(2): 102-109 . doi: 10.11858/gywlxb.1987.02.002

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Abstract:
In the present paper, the sysem FeO-MgO-Al2O3-CaO-SiO2 has been studied in an attempt to determine the effects of aluminum and calcium on the stability of the silicate perovskite. A series of synthesized silicate glasses were converted to silicate-perovskites in a diamond cell at approximately 40 GP...

Gauge Field Theory of the Breaking Criterion of Materials Subjected to Intensive Shock Loading

WANG Ke-Gang, DONG Lian-Ke, LONG Qi-Wei

1987, 1(2): 110-120 . doi: 10.11858/gywlxb.1987.02.003

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Abstract:
The paper presents the generalized E. Noether symmetrical theorem providing the Bessel-Hagen's divergence on gauge field theory is invariance. With the aid of the theorem and gauge field theory of defects, the formula of a breaking criterion of materials subjected to loading is obtained. The formula...

Crystallization of Amorphous Fe78Si9B13 Alloy under High Pressure

WANG Zhao, MENG Zhao-Fu, WANG Yu-Ming, WANG Wen-Kui

1987, 1(2): 121-129 . doi: 10.11858/gywlxb.1987.02.004

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Abstract:
In this paper the effects of high pressure on the crystallization temperature of amorphous Fe78Si9B13 alloys were investigated. The time-temperature-transition (T-T-T) diagrams at atmosphere and 7.5 GPa were obtained. And it was found that both crystallization temperature and the phase formation wer...

Superconductivity of Crystallized Phases from Amorphous La80Al20

HUANG Xin-Ming, HE Shou-An, WANG Wen-Kui

1987, 1(2): 130-137 . doi: 10.11858/gywlxb.1987.02.005

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Abstract:
In this paper, we studied the structures and superconductivity of the samples annealed from a morphous La80Al20 alloy under different treatments. It was found that when annealed in vacuum at 250 ℃, the a morphous alloy crystallized into the sample of a tetragonal single phase La4Al for which where i...

Transport Properties of Electrons in Metallic Glasses Fe100-xBx under Hydrostatic Pressure

HAN Shun-Hui, HAN Han

1987, 1(2): 138-143 . doi: 10.11858/gywlxb.1987.02.006

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Abstract:
The temperature dependece of electric resistance in metallic glasses Fe100-xBx (16x22) under pressure of 0~1.2 GPa and temperature of 54~300 K was measured. The experimental data are fitted and discussed with the generalized Ziman theory herein.

Badiometric Measurements of Overtaking Rarefaction Wave Velocities in Shock-Loaded Brass under High Pressures

WANG Gui-Chao, XIE Pan-Hai, TAN Zhen-Nan

1987, 1(2): 144-149 . doi: 10.11858/gywlxb.1987.02.007

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Abstract:
Overtaking rarefaction velocities in shock-loaded H62-brass were measured by using radiometry in the pressure range from 143~182 GPa, and the PMMA were used as the window material. Formulae for determing the overtaking rarefaction velocity are given in case of a symmetrical impaction. The experimena...

EOS and Phase Structure Stability of Lithium

ZHANG Chun-Bin, ZHANG Shi-Ze, LI Shao-Meng, LIN Shao-Ming, ZHANG Wan-Xiang

1987, 1(2): 150-154 . doi: 10.11858/gywlxb.1987.02.008

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Abstract:
Using the LMTO method, we calculated the EOS for bcc and fcc lithium with compressibility ranging from 1 to 12. The results (: 1~12, pressure up to 103 GPa) are compared with the experiments (3) and the TF model. The phase structure stability was studied by calculating the total energy. It is shown ...

Calculation of the Gruneisen Parameter and Its Pressure Dependence for NaCl

WU Shao-Zeng, ZHANG Cheng-Xiang, WU Li-Xin

1987, 1(2): 155-164 . doi: 10.11858/gywlxb.1987.02.009

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Abstract:
The Gruneisen parameter and its pressure dependence for NaCl are calculated by using the rigid-ion model. In the calculation a new form of potential energy, which has been used previously to successfully calculate the equation of state of NaCl, is adopted as follows. Two forms of modified Born-Mayer...

The Thermal Stability and Variation of Precipitated Phase in Amorphous Zr70Cu30 Alloy at High Pressure

SHEN Zhong-Yi, CHEN Gui-Yu, ZHANG Yun, YIN Xiu-Jun, SHEN De-Jiu, WU Hao-Quan

1987, 1(2): 165-172 . doi: 10.11858/gywlxb.1987.02.010

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Abstract:
The thermal stability and the variation of constituent crystallised phase in annealing a morphous Zr70Cu30 alloy under a pressure of 2 GPa were examined by resistance measurement and X-ray diffration analysis results show an increment of crystallizing temperature at high pressure. An evident variati...

Preparations of Large-Scale YBaCuO System Sample and Its Superconductivity

HAI Yu-Ying, ZHANG Wan-Xiang

1987, 1(2): 173-175 . doi: 10.11858/gywlxb.1987.02.011

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Abstract:
Using the hydrostatic pressure method we have prepared some uniform superconducting YBaCuO bars with regular shape of 11 mm diameter and 110 mm length. The samples show onset of superconductivity at 105~106 K. Zero resistance in the range from 89 K to 92 K, and resistive transition width 5~8 K.

The Pressure Gradient in the Superhigh Pressure Chamber for Diamond Synthesis

YANG Zong-Qing, WU Zhao-Qing, WANG Wei-Dong, ZHANG You-Jun, LI Jia

1987, 1(2): 176-183 . doi: 10.11858/gywlxb.1987.02.012

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Abstract:
The pressure gradient has been measured by authors using graphite which is widely applied to diamond synthesis instead of traditional material silver chloride. The pressure gradient in graphite pressure chamber increases with the pressure. The axial pressure gradient is 21.8 MPa/mm and the radial on...

A Study on the Oxidation Resistance of Sintered Diamond Polycrystals

WANG De-Xin, XUE Yong-Jin, JIAO Qing-Yu, LIU Pei-Luan

1987, 1(2): 184-187 . doi: 10.11858/gywlxb.1987.02.013

PDF (602)

Abstract:
The oxidizing temperature of sintered diamond polycrystals was measured with the comprehensive differential heating analyser. It has been concluded that the oxidation resistance of sintered diamond polycrystals is determined by those of the binders and the intermediate agglutinated layer between dia...

Equations of State for Two Kinds of Stainless Steel at High Pressure

BAO Zhong-Xing, GU Hui-Cheng, ZHANG Zhi-Ting

1987, 1(2): 188-190 . doi: 10.11858/gywlxb.1987.02.014

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Abstract:
The p-V relationships for two kinds of stainless steel at room temperature and up to 4.5 GPa are measured and their Bridgman equations are given respectively. Using the coefficients a and b in these Bridgman equations, their Gruneisen parameter 0, bulk moduli B0 and first order pressure derivatives ...

1987 Vol. 1, No. 2

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