高压物理学报

Cubic Silicon Nitride and Its Synthesis by Shock Wave Compression

HE Hong-Liang

2007, 21(1): 1-7 . doi: 10.11858/gywlxb.2007.01.001

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Abstract:
Cubic silicon nitride is a new polymorphous of Si3N4 synthesized under high pressure and high temperature. Compared to the two known hexagonal phases of and , the new phase is about 26% denser in density, and it is predicted to be a new multi-functional ceramic. The achievement and related concern o...

Equations of State for Fluid Hydrogen and Deuterium: Dissociation Effects Studies

TIAN Chun-Ling, JING Fu-Qian, GU Yun-Jun, CAI Ling-Cang, LIU Fu-Sheng

2007, 21(1): 8-14 . doi: 10.11858/gywlxb.2007.01.002

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Abstract:
Molecular hydrogen and deuterium under high temperature and high density conditions may undergo dissociation reaction, and thus transforms to an interacting mixture composed of molecules and atoms with complex interactions between constituent particles. In this paper, we use onecomponent fluid van ...

High Temperature and High Pressure Synthesis and Study of 0212-Type Ca3Cu2O4+Cl2-y

YANG Da-Xiao, LIU Qing-Qing, GAO Wei-Bo, YU Wen, LI Feng-Ying, JIN Chang-Qing

2007, 21(1): 15-19 . doi: 10.11858/gywlxb.2007.01.003

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Abstract:
Using the apical oxygen doping mechanism, i. e. a partial substitution of divalence O for the monovalence Cl, we synthesized Ca3Cu2O4+Cl2-y with Ag2O under high temperature and high pressure. From X-ray diffraction composition analysis, we confirmed that Ca3Cu2O4+Cl2-y crystallizes into a 0212 struc...

Experimental Study on the Microstructures and Dynamic Behavior of a PBX Substitute Material

ZHANG Peng, ZHAO Feng, BAI Shu-Lin, FU Bin, ZHANG Guo-Hua

2007, 21(1): 20-28 . doi: 10.11858/gywlxb.2007.01.004

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Abstract:
The microstructures and intrinsic defects engendered during the compression process of manufacture of a PBX substitute material D-90031, as well its dynamic behavior and failure mechanisms were studied. By using digital image treatment technique, in situ nano-indenter system, Split Hopkinson Pressur...

Synchrotron Radiation of Different Nano Size ZnS Nanocrystalline under High Pressure Induced

PAN Yue-Wu, YU Jie, CUI Qi-Liang, GAO Chun-Xiao, ZOU Guang-Tian, LIU Jing

2007, 21(1): 29-34 . doi: 10.11858/gywlxb.2007.01.005

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Abstract:
In-situ energy dispersive X-ray diffraction (EDXD) on ZnS nanocrystalline was carried out under high pressure by using a diamond anvil cell (DAC). Phase transition of nano ZnS from wurtzite to rocksalt occurred at 16.0 GPa and 16.7 GPa for 10 nm and 3 nm sample, respectively, which were higher than ...

Investigation of Precursor Decay and Stress Relaxation in Shock-Compressed 20 Steel

WANG Yong-Gang, HE Hong-Liang

2007, 21(1): 35-39 . doi: 10.11858/gywlxb.2007.01.006

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Abstract:
The precursor decay and stress relaxation behavior of 20 steel under shock compression were studied using planar impact experiments with different sample thickness. Time resolved free surface velocity profile measurements are performed by means of a velocity interferometer system for any reflector (...

Electrical Conductivity and X-Ray Diffraction Study of Iron under High Pressures

HUANG Wei-Jun, CUI Qi-Liang, BI Yan, ZHOU Qiang, ZOU Guang-Tian

2007, 21(1): 40-44 . doi: 10.11858/gywlxb.2007.01.007

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Abstract:
Four electrodes method and the magnetic sputter film deposition technique combined with photolithographic shaping method are used to measure the electrical resistance of iron up to 25 GPa. Furthermore, in-situ high pressure X-ray diffraction experiment was performed for measuring the lattice paramet...

Equation of State and Phase Transition of (Mg0.92, Fe0.08) SiO3 Enstatite under Shock Compression and Its Geophysical Implications

YANG Jin-Ke, GONG Zi-Zheng, DENG Li-Wei, ZHANG Li, FEI Ying-Wei

2007, 21(1): 45-54 . doi: 10.11858/gywlxb.2007.01.008

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Abstract:
We performed shock wave experiments on a natural pyroxene with chemical composition close to (Mg0.92, Fe0.08)SiO3 and initial density of 3.06 g/cm3 at pressures between 48 and 140 GPa, using impedance match method and electrical probe technique. Considering McQueen et. al. data, it is obvious that (...

Thermoelectric Properties of N-PbTe Doped with Sb2Te3 Prepared by High-Pressure and High-Temperature

SU Tai-Chao, ZHU Pin-Wen, MA Hong-An, REN Guo-Zhong, GUO Jian-Gang, IMAI Yoshio, JIA Xiao-Peng

2007, 21(1): 55-58 . doi: 10.11858/gywlxb.2007.01.009

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Abstract:
N-type PbTe compounds doped with Sb2Te3 have been prepared at high-pressure and high-temperature (HPHT). The thermoelectric properties of all the samples have been measured at room temperature. The Seebeck coefficients in absolute value and the electrical resistivities decrease with an increase of S...

Plasticity Mechanism Associated with Nano-Void Growth under Impact Loading along 〈111〉 Direction in Copper

DENG Xiao-Liang, ZHU Wen-Jun, HE Hong-Liang, WU Deng-Xue, JING Fu-Qian

2007, 21(1): 59-65 . doi: 10.11858/gywlxb.2007.01.010

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Abstract:
Evolution of Nano-void (diameter d1.3 nm) in single crystal copper and associated plasticity deformation around the nano-void under impact loading are investigated by means of molecular dynamics (MD) simulation. The results of simulation reveal that in the tensile process there are three of all four...

Experiment and Calculation of Output Current of Ferroelectric Ceramics in Parallel Connection Loaded by Shock Waves

CHEN Lang, TENG Xiao-Qin, LU Jian-Ying, FENG Chang-Gen

2007, 21(1): 66-70 . doi: 10.11858/gywlxb.2007.01.011

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Abstract:
To analyze the characters of out current of different number ferroelectric ceramics, the tests of PZT95/5 ferroelectric ceramics in parallel connection loaded by the shock waves were carried out. The output currents of ferroelectric ceramics for the resistance loads were measured. A model calculatin...

2D Numerical Simulation of Spallation in Three Steels with the Damage Function Model

PEI Xiao-Yang, LI Ping, DONG Yu-Bin

2007, 21(1): 71-76 . doi: 10.11858/gywlxb.2007.01.012

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Abstract:
A damage function model is implemented in 2D finite element code-DEFEL, with which the simulation of plate surface spallation testing is performed by using the material parameters of three type steel, HR-2, 2169 and 45. The effect of strain-hardening and Bauschinger are taken into account. The calcu...

Experimental Study on Detonation Characteristics of Several Liquid Fuel-Air Clouds in Shock Tube

YAO Gan-Bing, XIE Li-Feng, LIU Jia-Cong

2007, 21(1): 77-82 . doi: 10.11858/gywlxb.2007.01.013

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Abstract:
The detonation characteristics of fuel (PO, IPN, C5~C6, hexane, heptane, Decane)-air cloud were studied in shock tube. The critical initiation energy was measured by the up and down method and cell size by smoked metallic foil. The comparison of detonation characteristics among these fuels was also ...

Dynamic Behavior of Ta-Nb Alloy under Shock Compression

HUA Jin-Song, GU Yan, ZHANG Shi-Wen, WANG Peng-Lai, FENG Dong-Sheng

2007, 21(1): 83-88 . doi: 10.11858/gywlxb.2007.01.014

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Abstract:
A new kind of Ta-Nb alloy has been studied. By means of ultrasonic measurement, its sound velocities of longitudinal wave and transverse wave were obtained, and some of its static mechanical parameters were calculated. Through shock compression experiments with a two stage gas gun, its shock Hugonio...

Influence of Combined Treatment of Ultra High Pressure and Enzyme Inhibitors on Peroxidase and Pectin Methyl Esterase in Litchi Pulp

HUANG Li, SUN Yuan-Ming, CHEN Bai-Nuan, HUANG Wei, ZHAN Guo-Lian

2007, 21(1): 89-94 . doi: 10.11858/gywlxb.2007.01.015

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Abstract:
In order to investigate the effects of combined treatment of ultra high pressure (UHP) and enzyme inhibitors on the activities of peroxidase (POD) and pectin methyl esterase (PME) in litchi pulp, two kinds of enzyme inhibitor prescriptions were designed including group A (citric acid 5 g/L+L-ascorbi...

Effect of High Pressure on Exoproteinase of Bacillus subtilis

XIE Hui-Ming, HUANG Xun-Duan, PAN Jian, ZENG Qing-Mei, WANG Hai-Xiang, JIANG Ye-Lei

2007, 21(1): 95-102 . doi: 10.11858/gywlxb.2007.01.016

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Abstract:
We studied the effect of high pressure process (HPP) on exoproteinase of Bacillus subtilis by using Box-Behnken response surface methodology. Experimental results showed that HPP could inhibit activity of exoproteinase significantly. In the course of treatment, pressure and temperature were key fact...

Calculational Model and Application of Acceleration of Projectile in Bore about DAVIS Gun Experiment

DUAN Ji-Yuan, LIU Cang-Li, WANG Yan-Ping, YU Chuan

2007, 21(1): 103-107 . doi: 10.11858/gywlxb.2007.01.017

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Abstract:
Aimed at idiographic structure of DAVIS gun, for accurately calculating acceleration of projectile in bore, this article emulationally calculated the launch of a DAVIS gun through classical interior ballistics, acquired the interior ballistic parameters-time curves and educed the acceleration-time c...

Damage and Cracking of Zr41Ti14Cu12.5Ni10Be22.5 Bulk Amorphous Alloy under Planar Shock Compression

LI Qiang, YANG Chao, ZHAN Zai-Ji

2007, 21(1): 108-112 . doi: 10.11858/gywlxb.2007.01.018

PDF (793)

Abstract:
Planar shock compression effects on damage and cracking in Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy are studied using a two-stage light gas gun. The experimental result indicates that the cracking angel of bulk amorphous alloy under planar shock compression is smaller than that of traditional c...

2007 Vol. 21, No. 1

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