高压物理学报

Effect of High Pressure on Electronic Structure of Super conducting La1.85Sr0.15CuO4

HAO Xue-Jun, ZHANG Li-Yuan, WANG Huai-Yu

1994, 8(1): 1-8 . doi: 10.11858/gywlxb.1994.01.001

PDF (564)

Abstract:
The electronic structure of La1.85Sr0.15CuO4 under atmosphere, 1 GPa, 4 GPa, 8 GPa has been calculated by the Recursion method. The changes of Fermi energy, total density dstates at EF, atomic valence at each site are given. Our results show that the change of Tc under high pressure is not due to th...

Problem of Heat Conduction behind a Shock Wave Front

ZHANG Guan-Ren

1994, 8(1): 9-13 . doi: 10.11858/gywlxb.1994.01.002

PDF (781)

Abstract:
In this paper, the author proves that there exists a heat conduction wave behind a shock front. If the radiation is not considered, the speed of the heat wave exactly coincides with that of the shock wave, but it has its own distribution behind the shock front.

Some Topics in Shock-Induced Phase Transitions

TANG Zhi-Ping

1994, 8(1): 14-22 . doi: 10.11858/gywlxb.1994.01.003

PDF (852)

Abstract:
In this paper, the progresses and trends in some active topics for shock-induced phase transition research are reviewed, such as phase transition plasticity, shear stress effects, post-phase-transition behavior, theory and constitutive description for shock-induced phase transitions, and instantaneo...

Experimental Studies of the Blowoff Impulses Produced in the Flat Plate Targets Bombarded by Electron Beam

PENG Chang-Xian, XU Yong-Liang, XU Jian-Bo

1994, 8(1): 23-29 . doi: 10.11858/gywlxb.1994.01.004

PDF (677)

Abstract:
The blowoff impulses are the condition of applied loads of the structural response induced in the target structures bombarded by electron beam. In this paper, the experimental studies of the blowoff impulses produced in the flat plate targets bombarded by electron beam on FLASH-Ⅱ equipment of late y...

Hydrostatic Pressure Dependence of Forced Volume Magnetostriction of Seven Amorphous Alloys

SU Fang, SU Jun

1994, 8(1): 30-35 . doi: 10.11858/gywlxb.1994.01.005

PDF (703)

Abstract:
Forced volume magnetostriction is too minute 10-10~10-9[(103/4)(A/m)]-1 to be measured accurately by repeated addition of linear magnetostriction 10-6[(103/4)(A/m)]-1. According to thermodynamic relation, (d/dH)T,p=-(dMs/dp)T,H ,we measured the Ms-p curve and obtained the hydrostatic pressure depend...

Thick-Grain Diamonds Growth and Ascertainment of Its Thermodynamic Conditions

LIN Ming-Xi, LI Ying-Hua

1994, 8(1): 36-42 . doi: 10.11858/gywlxb.1994.01.006

PDF (716)

Abstract:
In this paper, starting from theory of thermodynamics, we have studied the dispersion characteristic of crystalline-grain and crystalline-quality of diamonds, on the basis of equilibrium diagram theory of graphite-diamond (G-D) phases. The key to the discussion is placed on the growth districts of t...

A Method for Indirect Observation of the Pressure in the Cylindrical Metal Tube under Shock Compression

HUA Jin-Song, DONG Qing-Dong, TAN Hua

1994, 8(1): 43-48 . doi: 10.11858/gywlxb.1994.01.007

PDF (696)

Abstract:
The paper describes a method to observe the pressure of powder samples filled in a cylindrical metal tube which will be subjected to explosive compression. As an example, we measured the pressure in the explosive shock synthesis of wurtzite-type boron nitride (wBN) from graphite-type BN. The results...

A Theoretical Study on Heat Conduction Following Shock Compression

LIN Hua-Ling, YU Wan-Rui

1994, 8(1): 49-56 . doi: 10.11858/gywlxb.1994.01.008

PDF (970)

Abstract:
The interface temperature and the temperature history near the interface following the shock compression are calculated by the method of Cattaneo heat conduction. They are compared with the results via Fourier heat conduction. The effects of thermal relaxation time constants on the interface tempera...

Electronic Structure and EOS of -SiC

XIE Yuan-Nan

1994, 8(1): 57-59 . doi: 10.11858/gywlxb.1994.01.009

PDF (869)

Abstract:
By using LMTO-ASA method, the computational results including electronic structure and EOS of covalent crystal -SiC are presented. The compressibility ranges from 1.0 to 2.5. We put two empty spheres into WS sell to simulate compact-packed situation. It is shown that the used method is adapted for l...

Influence of High Pressure on Formation of Intermediate Phases of Mn4Si and Formation of Dodacagonal Quasicrystal in Mn4Si Alloy under High Static Pressure

XU Da-Peng, SONG Yan-Bin, SU Wen-Hui, LIN Hua-Mao

1994, 8(1): 60-64 . doi: 10.11858/gywlxb.1994.01.010

PDF (726)

Abstract:
The formation and stability of the intermediate phases of Mn4Si have been investigated by the method of quenching in fusing state under high static pressure (MQFSHP). The results show that (Mn4Si) phase , which is the main part in the Mn4Si alloy smelted in vacuum furnace is unstable; (Mn4Si) R phas...

Synthesis of High-Pressure Diamond Using Graphite Over Which CVD Diamond Grains Were Grown

JIN Zeng-Sun, Lü Xian-Yi, ZHANG Tie-Chen, ZOU Guang-Tian

1994, 8(1): 65-68 . doi: 10.11858/gywlxb.1994.01.011

PDF (911)

Abstract:
CVD diamond grains have been grown on polycrystalline graphite pieces by the hot-filament CVD method using mixtures of methane and hydrogen, and high-pressure diamond was synthesized by 66 MN (6600 t) cubic high pressure apparatus using CVD diamond-grown graphite. The experimental results show that ...

X-Ray Diffraction Experiment Observation of Ag at over 100 GPa Pressrues

GU Hui-Cheng, LI Feng-Ying, WANG Ji-Fang, CHEN Liang-Chen

1994, 8(1): 69-72 . doi: 10.11858/gywlxb.1994.01.012

PDF (907)

Abstract:
In this paper, the experimental methods and procedures at over 100 GPa pressure were described in detail. The experiments were carried out in a high pressure device with lever type diamond anvil cell (DAC). An in situ over 100 GPa high pressure X-ray diffraction observation of Ag was conducted at a ...

Pressure-Induced Formation of Amorphous Alloys

LI Dong-Jian, WANG Jing-Tang, DING Bing-Zhe, LI Shu-Ling

1994, 8(1): 73-79 . doi: 10.11858/gywlxb.1994.01.013

PDF (657)

Abstract:
The high pressure amorphization is studied in this paper, and the influence of pressure was discussed on the nucleation free energy, critical cooling rate during quenching process. Theoretical analyses indicate that the formation of metastable phase (MP) is the prerequisite of that of amorphous phas...

1994 Vol. 8, No. 1

Login in

NewsMore

LinksMore