高压物理学报

1994 Vol. 8, No. 4

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A New Criterion of Hardness for Materials with Rocksalt Structure

LIU Xiao-Yang, SU Wen-Hui, MENG Chang-Gong, HU Zhuang-Qi

1994, 8(4): 241-247 . doi: 10.11858/gywlxb.1994.04.001

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Abstract:
A new criterion of hardness is proposed based on the analysis of the bonding in fourteen rocksalt-structure solids with the aid of discrete variational Xa (DV-Xa) cluster calculations. The concept of bond density is introduced to measure the hardness of materials. And there is a good linear relation...

Shock Compressibility of Heavy Water

LIU Fu-Sheng, LIU Xiao-Jun, CHENG Ju-Xin, CHEN Xian-Meng, JING Fu-Qian, GOU Qing-Quan

1994, 8(4): 248-253 . doi: 10.11858/gywlxb.1994.04.002

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Abstract:
Shock compression curve for heavy water (D2O) was measured in the range of 10～43 GPa by means of a two-stage light-gas gun. Shock velocities were measured to 1.2%～1.5% accuracy using the ASM probe. Impactor velocities were measured to 0.5% accuracy using an electric pin system with nanosecond time r...

Shock Temperature Measurements for Metal (Ⅰ)－Calibration of Pyrometers and Data Reduction for the Temperature at the Interface

TAN Hua

1994, 8(4): 254-263 . doi: 10.11858/gywlxb.1994.04.003

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Abstract:
Basic experimental procedures in calibrating the pyrometers used in the shock temperature measurements of metals were discussed. Methods to obtain the energy emitted from the metal sample/window interface as well as the interface temperature via Planck radiation law were presented in the paper.

Growth of Spherical Void in Viscoplastic Medium under Tensile Dynamic Loading

WANG Ze-Ping

1994, 8(4): 264-271 . doi: 10.11858/gywlxb.1994.04.004

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Abstract:
A new evolution equation of growth of spherical voids in viscoplastic medium under dynamic tensile loading is presented in this paper. In the evolution equation, strain rate, local inertial effects and work-hardening behaviour of the material are taken into account, and the influence of these effect...

Electronic Structures and Equation of State for Aluminium under High Pressure

ZHANG Chun-Bin, LI Shao-Meng, TENG Ya-Gang

1994, 8(4): 272-278 . doi: 10.11858/gywlxb.1994.04.005

PDF (719)

Abstract:
The study for Al up to the pressure p=10 TPa, the compression 0/=10, by using the first principle calculations is performed. The energy band structures and electronic occupation numbers of the states for a series of lattice constants are presented. It follows from the energy band structures that s b...

High Pressure Measurements of the Elastic Parameters of Ultrasonic State Equation for Cubic Crystal

WU Kun-Yu, SU Fang, XIE-Bin

1994, 8(4): 279-284 . doi: 10.11858/gywlxb.1994.04.006

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Abstract:
By using the technique of ultrasonic pulse-echo overlap, the pressure variations of the natural sound velocity in cubic crystals Si and Bi12GeO20 for pure longitudinal and shear waves propagating along [100], [110] and [111] direction were measured in 0.1～500 MPa hydrostatic pressure range. Based on...

Impurity and Colouration Mechanism in cBN Crystal

ZHANG Tie-Chen, GUO Wei-Li, ZOU Guang-Tian, HU En-Liang, YU Hong-Chang, LI Kai-Song

1994, 8(4): 285-289 . doi: 10.11858/gywlxb.1994.04.007

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Abstract:
cBN crystal is a material synthesized under high pressure and high temperature. The crystal always contains more or less impurities relevant to its synthetic environment. The impurities will affect the color of cBN crystal. In this paper, impurities were measured, and coloration mechanism of cBN cry...

Study on Compressive Behavior of -Fe2SiO4 under Hydrostatic Pressure

WANG Li-Jun, Ming L C, Manghnani M H

1994, 8(4): 290-295 . doi: 10.11858/gywlxb.1994.04.008

PDF (733)

Abstract:
The compressive behavior of -Fe2SiO4 at high pressure up to 23 GPa and room temperature has been measured by using synchrotron radiation and in situ high pressure X-ray diffraction techniques with DAC. The p-V relationship of -Fe2SiO4 at 0～23 GPa indicated that the isothermal compression process can...

Studies on High Speed Reaction Spectrum of Nitromethane under High Temperature and High Pressure

HU Dong, WANG Yong-Guo, LU Hong-Bin, SUN Zhu-Mei

1994, 8(4): 296-301 . doi: 10.11858/gywlxb.1994.04.009

PDF (596)

Abstract:
High speed reaction spectra ignited for the mixture of nitromethane and oxygen are successfully studied by using multi-monochromator, photoelectric system and high speed data acquisition system. Both intermediates and termination products, for example, CH3O, CH, CH2O, OH, CHO, CO, CO2, H2O, NO, NO2 ...

A Study on Calculation of the Linear Thermal Expansion Coefficients of Metals

ZHENG Wei-Tao, DING Tao, ZHONG Feng-Lan, ZHANG Jian-Min, ZHANG Rui-Lin

1994, 8(4): 302-305 . doi: 10.11858/gywlxb.1994.04.010

PDF (1789)

Abstract:
Based on the expression of pressure at temperature T and in terms of the universal equation of state Debye model and the thermodynamic relations, a general expression for the calculation of the linear thermal expansion coefficients of metals is obtained. This formula applied to the calculation of Al...

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Founded in 1987, monthly

Hosted by:Institute of Fluid Physics, CAEP

Sponsored by:Topical Committee of High Pressure of Chinese Physical Society Sichuan Physical Society

Editor-in-Chief:MA Yanming

1994 Vol. 8, No. 4

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