高压物理学报

A Study on the Compression Law of H- Ions in the Alkali Hydride Crystals by the Ionic Overlap-Compression Model

WANG Xin-Qiang, GOU Qing-Quan

1993, 7(3): 161-166 . doi: 10.11858/gywlxb.1993.03.001

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Abstract:
By using the ionic overlap-compression model, the parameter describing the state of H- by ions in the alkali hydride crystals (LiH, NaH and KH) was calculated by variation method. Then the numerical relations of and the relative radius of H- ions with the pressure were determined. The results show t...

Pressure-Induced Non-crystallization in Eu2+ Activated Sr-Borates

LIU Wei-Na, LIU Hong-Jian, FENG Yu-Chen, SUN Shu-Lan, SU Wen-Hui

1993, 7(3): 167-176 . doi: 10.11858/gywlxb.1993.03.002

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Abstract:
High pressure-induced crystallization in disordered or non-crystalline matter is well known. Pressure-induced disordering or non-crystallizing in crystals, however, has been seldom found so far. In the present paper, under the pressure of 3.0~7.0 GPa, the pressure-induced non-crystallization phenome...

X-Ray Observations of the Shock-Induced Transformation from gBN to wBN

TAN Hua, HAN Jun Wan, WANG Long-Shu, HE Jia-Qing

1993, 7(3): 177-182 . doi: 10.11858/gywlxb.1993.03.003

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Abstract:
X-ray diffraction observations were used to analyze the phase transformation of graphite-type BN (gBN) with different crystallinities to wurtzit-type BN (wBN) under the same shock compression conditions. Impurities contained in the wBN powders were also estimated. Results show that the conversion ra...

Study on Wurtzite Type Boron Nitride and Its Applications (Ⅱ)Isothermal Equation of State for Wurtzite Type Boron Nitride

LIU Bing-Bing, YANG Hai-Bin, CHI Yuan-Bin, LI Ming-Hui, WANG Li-Zhong

1993, 7(3): 183-190 . doi: 10.11858/gywlxb.1993.03.004

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Abstract:
In our experiments, the isothermal equation of state of wBN is studied by two different in situ high pressure X-ray diffraction methods at room temperature. The sample is obtained by shock compression. One of the methods is the rotating anode X-ray angle dispersive powder diffraction by which wBN is...

Magnetization Character of Amorphous Magnetic Alloys at High Hydrostatic Pressure

SU Fang, HUANG Ding

1993, 7(3): 191-201 . doi: 10.11858/gywlxb.1993.03.005

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Abstract:
Magnetization curves and magnetic permeability of amorphous alloys FeCoNiSiVB, FeSiB, FeCrSiB, FeCoSiB in the hydrostatic pressure range of 0.000 1~2.4 GPa were investigated. Besides, the relation between pressure and the maximum magnetic permeability max of the four alloys was obtained with accurat...

X-Ray Diffraction Studies on C60 under High Pressure

LIU Li-Jun, CHEN Liang-Chen, Chen Hong, WANG Ru-Ju, ZHANG Zhi-Ting, CHE Rong-Zheng, ZHOU Lei, WANG Ji-Fang, LI Yu-Liang, YAO You-Xin, et al

1993, 7(3): 202-207 . doi: 10.11858/gywlxb.1993.03.006

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Abstract:
In situ high pressure X-ray diffraction experiments have been done for super-pure C60 powder sample using synchrotron radiation X-ray source and an energy dispersion detector. The pressure is generated by DAC. Pt was used as an inner pressure standard, whose EOS is known. The pressure of the sample ...

A Study on New Orthorhombic Approximants of the Al70Co15Tb5Ni10 Decagonal Quasi-crystal

YU Ri-Cheng, XU Da-Peng, SU Wen-Hui, PANG Yan-Xin

1993, 7(3): 208-213 . doi: 10.11858/gywlxb.1993.03.007

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Abstract:
Two new orthorhombic approximants with the largest until cell observed up to now were found in the Al70Co15Tb5Ni10 decagonal quasi-crystal, which were prepared by quenching (102 ℃/s) the melt state (1 700 ℃) under high static pressure (7.0 GPa). The lattice parameters of the orthorhombic approximant...

The Principle of the Explosive Welding for Multilayer Amorphous Foils

LI Xiao-Jie, ZHANG Kai

1993, 7(3): 214-219 . doi: 10.11858/gywlxb.1993.03.008

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Abstract:
A dynamic model about the explosive welding of multilayer foils was given in this paper. We proved that the particle velocity behind the shock wave was the impact velocity between the two foils and the dynamic behavior of the multilayer foils system was similar to that of the porous material system....

Determination of the Vertical Sections of the High Pressure Phase Diagrams of Cd(0.2)-Sn-Zn Ternary Alloy System

SONG Li-Zhu, YANG Hua, ZHAO Mu-Yu, SHEN Zhong-Yi, LIU Yong

1993, 7(3): 220-225 . doi: 10.11858/gywlxb.1993.03.009

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Abstract:
Several vertical sections of the phase diagrams of Cd-Sn-Zn ternary alloy system with a constant composition of xCd=0.2 were determined by differential thermal analysis (DTA) at high pressures. Working pressures were 0, 0.5, 1.0, and 1.5 GPa. The eutectic temperature of the system increased by about...

A Study of the Equation of State of Alumina Ceramics

LI Da-Hong, WANG Wu

1993, 7(3): 226-231 . doi: 10.11858/gywlxb.1993.03.010

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Abstract:
Equation of state of alumina ceramics was obtained by using explosive loading techniques and impedance match method. The experimentally measured shock velocity D and particle velocity u of this ceramics can be fitted linearly in the form of D==(2.600.20)+(1.650.09)u (km/s). Based on the above experi...

Calculations of the High Pressure Phase Transition Point of NaCl, KCl and NaF Crystals

ZHANG Cheng-Xiang, WU Shao-Zeng, WU Shu-Yan, WU Xue-Yuan

1993, 7(3): 232-237 . doi: 10.11858/gywlxb.1993.03.011

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Abstract:
By using the theory of lattice dynamics, the Gibbs free energies of NaCl, KCl and NaF crystals were calculated for both NaCl and CsCl structures. Results show that the large, attractive short-range interaction between the second neigbour ions may play an important role in the explanation of the rela...

Study on the Heating Technology of Non-constant Power

HAO Zhao-Yin, CHEN Yu-Fei

1993, 7(3): 238-240 . doi: 10.11858/gywlxb.1993.03.012

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Abstract:
In this paper, we have discussed the theory and experimental evidence on the non-constant power heating technology growing diamond at high pressure and temperature and have used this technology for growing good quality diamond crystals.

1993 Vol. 7, No. 3

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