高压物理学报

High-Pressure Synthesis of Superconducting Pr1-xCaxBa2Cu3O7-

XIONG Yu-Feng, YAO Yu-Shu, HUANG Yun-Kai, JIA Shun-Lian, JIN Duo, ZHAO Zhong-Xian

1999, 13(2): 81-86 . doi: 10.11858/gywlxb.1999.02.001

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Abstract:
The new bulk superconductors Pr1-xCaxBa2Cu3O7- (0.4x0.6) have been synthesized under a high-pressure of 5 GPa and 1 000 ℃ for 30 min. The solubility of Ca in Pr-123 phase has much increased by the high pressure synthesis method, that effectively compensates the hole-filling by Pr on CuO2 planes and ...

Experimental Study and Theoretical Exploration on Interaction Potential and Mixing Law for Mixture of Carbon and Water

HU Dong, YANG Xiang-Dong, JING Fu-Qian, WANG Yong-Guo, LI Xiao-Chang, SUN Zhu-Mei, DONG Shi, SHI Shang-Chun

1999, 13(2): 87-92 . doi: 10.11858/gywlxb.1999.02.002

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Abstract:
The behavior of shock compression of the mixture of carbon and water is studied by means of loading technique of two stage light gas gun. It is found that the behavior in the mixture of graphite and water is different to the mixture of diamond and water below shock loading pressure of 19 GPa; as sho...

Studies of EOS for Detonation Products: Liquid Nitrogen, Liquid Helium and Water

YANG Xiang-Dong, HU Dong, JING Fu-Qian

1999, 13(2): 93-102 . doi: 10.11858/gywlxb.1999.02.003

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Abstract:
The improved WCA theory and Ross's variation perturbation theory are used to study the shock-compression properties of liquid nitrogen, helium and water, while the exponential-six potential is used to calculate the free energy. Our study shows that in the calculation of shock-compression properties ...

Phase Diagram of Halloysite under High Pressure and Temperature and Its Geophysical Implications

GONG Zi-Zheng, XIE Hong-Sen, JING Fu-Qian, TAN Hua, BI Yan

1999, 13(2): 103-107 . doi: 10.11858/gywlxb.1999.02.004

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Abstract:
Hugoniot measurements for halloysite with two different initial densities have been performed at the shock pressures up to about 100 GPa. Three distinct regions appear along their Hugoniots. For the samples of 0=1.375 g/cm3, a low-pressure phase (LPP) exists within the shock pressure up to about 12....

Crystallization of Amorphous (Fe0.99Mo0.01)78Si9B13 Alloy Reacted with Al

YAO Bin, YANG Zhao-Hai, LIU Li, SU Wen-Hui

1999, 13(2): 108-114 . doi: 10.11858/gywlxb.1999.02.005

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Abstract:
Crystallization products of amorphous (Fe0.99Mo0.01)78Si9B13 (FMSB) alloy or pure amorphous FMSB alloy reacted with Al are different under high pressure. The amorphous FMSB alloy reacted with Al may start crystallization at Al/FMSB interface by reacting diffusely with Al. It crystallizes to -Fe (Al)...

Studies of Shock-Activation of Silicon Nitride Powder

LU Fang-Yun, CAI Qing-Yu, ZHOU Xin-Gui, CHEN Gang, ZHOU An-Chen

1999, 13(2): 115-119 . doi: 10.11858/gywlxb.1999.02.006

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Abstract:
In this paper, we have studied the surface and microscopic features of the silicon nitride powders, which have been activated by shock waves in two pressures: 15.7 GPa and 25.6 GPa, and the sintering features of the ceramics sintered from the activated powders. The results show that the shock-activa...

An Analytic Solution for Flyer Plate Motion in Grazing Detonation

TAN Duo-Wang, SUN Cheng-Wei

1999, 13(2): 120-126 . doi: 10.11858/gywlxb.1999.02.007

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Abstract:
In this paper, an analytic solution is presented to calculate the flyer plate motion by grazing detonation. The solution was checked against experimental and finite element computer results, good agreement indicates that the solution can accurately describe the flyer plate motion. The solution is ve...

High-Pressure Phase State of Enstatite and Its Application in Geophysics

HUO Hui, GONG Zi-Zheng, JING Fu-Qian

1999, 13(2): 127-132 . doi: 10.11858/gywlxb.1999.02.008

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Abstract:
By using Birch-Murnaghan and Grneisen equation of state, Hugoniots of both perovskite Mg0.86Fe0.14SiO3 and the mixture of magnesiow stite (Mg0.86Fe0.14O) and stishovite (SiO2) have been calculated in this work. When compared with experimental Hugoniots, the calculations demonstrate that the above me...

Electrical Properties and Metallic Transitions in Nanocrystals Si at High Pressure

BAO Zhong-Xing, HE Yu-Liang, WANG Wei-Xiang, LIU Cui-Xia, CHEN Wei

1999, 13(2): 133-137 . doi: 10.11858/gywlxb.1999.02.009

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Abstract:
The resistance pressure and capacitance-pressure relationships for nanocrystals Si with grain sizes of 15～18 nm and 80 nm at room temperature and up to 24 GPa have been studied in a diamond anvil cell using resistance and capacitance measurements established by us. The experimental results show that...

Shock Activation of Titanium Oxide and Its Photocatalytic Activity

LIU Jian-Jun, YU Ying-Chun, LI Ying-Jun, HE Hong-Liang, TAN Hua, XU Kang

1999, 13(2): 138-142 . doi: 10.11858/gywlxb.1999.02.010

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Abstract:
The metal oxide catalyst TiO2 has been treated by shock wave, and then used as a photocatalyst for the dehydrogenation of H2S. Results show that, compared with the unshocked sample, the treated ones exhibit much higher photocatalytic activity within the experimental pressure range of 16～34 GPa, the ...

Emission Spectra of Shock-Compressed Carbon-Water Mixtures

LI Jing-Ze, LI Xiao-Chang, WANG Yong-Guo, HU Dong, JING Fu-Qian

1999, 13(2): 143-146 . doi: 10.11858/gywlxb.1999.02.011

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Abstract:
Emission spectra of shock-compressed graphite-water mixtures and diamond-water mixtures have been recorded by using the optical multichannel system(OMA-Ⅲ) at a two stage gas gun. Emission has been observed under a broad but strong background in a spectral range between 350 nm and 750 nm from the sho...

Model of Structural Transformation in Synthesizing Nano-Crystalline Diamond with Pulsed-Laser Induced Liquid-Solid Interface Reaction

WANG Jin-Bin, YANG Guo-Wei

1999, 13(2): 147-151 . doi: 10.11858/gywlxb.1999.02.012

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Abstract:
The physical and chemical mechanisms of synthesizing diamond nanocrystallites with pulsed-laser induced liquid-solid interface reaction (PLIR) have been analyzed in this paper. At the initial stage of nano-crystalline diamond growth, the models of structural transformation from hexagonal to rhombohe...

Multi-scaling Transport Equation on Fractals

ZENG Qiu-Hua, LI Hou-Qiang

1999, 13(2): 152-160 . doi: 10.11858/gywlxb.1999.02.013

PDF (630)

Abstract:
The general transport equation for multi-scaling disordered fractal media in three-dimensional case is derived from conservation of mass and on the basis of discussing Brownian motion, fractional Brownian motion and standard diffusion equation on fractals, the multiscaling fractional transport equat...

1999 Vol. 13, No. 2

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