高压物理学报

A New Thermodynamic Model for the Shock Compression Behavior Prediction for Porous Materials

WU Qiang, JING Fu-Qian

1996, 10(1): 1-5 . doi: 10.11858/gywlxb.1996.01.001

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Abstract:
Assuming that the specific heat at constant pressure cP is simply dependent on the pressure or remains constant, a new thermodynamic equation of state (EOS) is derived in this paper, which is very useful for the EOS studies, particularly in isobaric plane. Combining with Rankine-Hugoniot relations, ...

Pressure Effect on the Critical Temperature of HgBa2Ca2Cu3O8+y

HAN Cui-Ying, SHAO Hui-Min, LIN Wei, SONG Wei, JIA Shun-Lian, YAO Xi-Xian

1996, 10(1): 6-11 . doi: 10.11858/gywlxb.1996.01.002

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Abstract:
The critical temperature Tc of the superconductor HgBa2Ca2Cu3O8+y (Hg-1223) sample is determined by four probe resistivity measurements under quasi-hydrostatic pressure up to 7.8 GPa. Tc increases from 130K at ambient pressure to 141 K under a pressure up to 5.4 GPa. dTc/dp=1.85 K/GPa at pressures b...

The Preparation and Electron Spin Resonance Study of NiFe2O4 Nanosolids under High Pressure

SUI Yu, ZHENG Fan-Lei, XU Da-Peng, SU Wen-Hui

1996, 10(1): 12-18 . doi: 10.11858/gywlxb.1996.01.003

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Abstract:
In the present paper, the NiFe2O4 nanoparticles which were synthesized by the method of reserve drop coprecipitation, then compacted into nanosolids under different pressures. The variation of structure and interfacial states in NiFe2O4 nanosolids under different pressures are studied by XRD and ESR...

- Phase Transition under Pressure, Constant Magnetic Permeability and Its Pressure as Well as Frequency Characteristic in Nanometer-Scale Powder of Invar Alloy

SU Fang, XIE Bin, CHEN Yun-Hong

1996, 10(1): 19-29 . doi: 10.11858/gywlxb.1996.01.004

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Abstract:
By means of evaporation and condensation, three kinds of nanometer-scale powder of invar alloy (Fe-30wt%Ni) were prepared. It is found out with the method of TEM and X-ray diffraction that their composition coincides with its matrix alloy, average grain size is 13.6 nm (powder 5T) and 27 nm (powder ...

Synthesis Diamond of Perfect Cubic Morphology

LUO Jun-Yi, DING Li-Ye, LUO Xiang-Jie, CHEN Jiang-Hua, SUN Zhu-Mei, FU You-Kun

1996, 10(1): 30-36 . doi: 10.11858/gywlxb.1996.01.005

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Abstract:
Based upon the pre-study of relation between morphology and temperature in Ni70Mn25Co5-carbon system, synthesizing methods and growing rules of diamond have been studied experimentally by controlling the change of pressure and temperature in quasi-static way, in order that the regarded seeds of spon...

TEM Observation of Shear Bands in Ti-6Al-4V and AISI 6140 Steel

HU Ba-Yi, DONG Qing-Dong, HAN Chang-Sheng, ZHANG Hai-Ping

1996, 10(1): 37-43 . doi: 10.11858/gywlxb.1996.01.006

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Abstract:
The fragments contained adiabatic shear band (ASB) in Ti-6Al-4V and AISI 6140 steel were studied by scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show the structure of shear bands in Ti-6Al-4V and AISI 6140 steel being microgranular with average diameter ...

Numerical Simulation of the Temperature Distribution on a Tank Wall under an Intensive Laser Loading

ZHAO Jian-Heng, ZHANG Guan-Ren, LIU Xu-Fa

1996, 10(1): 44-49 . doi: 10.11858/gywlxb.1996.01.007

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Abstract:
A numerical model is presented to simulate the temperature distribution on the tank wall under an intensive laser loading. Thermal property parameters varying with temperature are included and the effect of the variation of the temperature distribution is studied in this paper.

Metallic Transitions in Several Kinds of Semiconductors at High Pressure

BAO Zhong-Xing, Tu C S, Anderson J R, Schmidt V H, Pinto N J

1996, 10(1): 50-55 . doi: 10.11858/gywlxb.1996.01.008

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Abstract:
Resistance-pressure (R-p) relationships in InP0.97As0.03, InP0.5As0.5, Ga0.76In0.24As and Ga0.24In0.76As at room temperature at high pressure have been studied in a diamond anvil cell using resistance measurement. Experimental results indicate that these samples all undergo metallic transitions in t...

Effects of Additive Li8SiN4 on cBN Crystal Morphology

ZHOU Yan-Ping, YAN Xue-Wei, MA Xian-Feng, ZHAO Ting-He, XIE Yun-Fen

1996, 10(1): 56-62 . doi: 10.11858/gywlxb.1996.01.009

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Abstract:
After adding Li8SiN4 into the catalytic system of Li-complex borom nitrides, the glossy transparent cBN brown crystals were synthesized under the conditions of high pressure and high temperature in the range 4.5～5.0 GPa and 1 500～1 800 ℃ respectively. The morphology of cBN crystals is studied. The r...

Studies on Impact Fracture Toughness of Composite Materials PP/AT

DAI Lan-Hong

1996, 10(1): 63-68 . doi: 10.11858/gywlxb.1996.01.010

PDF (662)

Abstract:
Impact fracture toughness of composite materials PP/AT with packing particle AT: 0, 10wt%, 15wt%, 20wt%, 30wt% and 40wt% is studied by means of Charpy impact testing machine respectively. Results demonstrate that adding AT can increase fracture toughness of PP/AT under a certain range of AT fraction...

Mechanism of Sintering Clinopyroxene Solid Solution CaMgSi2O6-NaAlSi2O6

ZHAO Ting-He, MA Xian-Feng, YAN Xue-Wei, CUI Shuo-Jing

1996, 10(1): 69-75 . doi: 10.11858/gywlxb.1996.01.011

PDF (586)

Abstract:
The effects of variation of the temperature and pressure on the nucleation and crystal growth of penetrating fibrous grains of sintered polycrystalline CaMgSi2O6(Di)-NaAlSi2O6(Jd) have been investigated. A more distinct effect of the pressure appears on the crystallization of DiJd at the lower tempe...

Observation on Original Crystals of hBN and cBN by EMS

ZHANG Tie-Chen, YU San, GUO Wei-Li, LIU Jian-Ting, ZOU Guang-Tian, LI Dong-Mei

1996, 10(1): 76-80 . doi: 10.11858/gywlxb.1996.01.012

PDF (627)

Abstract:
In the paper, the original products of hBN-catalyst system after treatments under high pressure and high temperature were observed by EMS. hBN and cBN phases were determined by method of electron diffraction. The results show that self-structure of these crystals is already formed in size 200～300 nm...

1996 Vol. 10, No. 1

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