Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel

1990 Vol. 4, No. 4

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High Pressure X-Ray Study on NiO Isothermal Equation of State up to 50 GPa
YANG Hai-Bin, LI Ming-Hui, WANG Li-Zhong, ZOU Guang-Tian
1990, 4(4): 241-245 . doi: 10.11858/gywlxb.1990.04.001
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Abstract:
The isothermal compression behavior of NiO was studied using the in-situ high pressure X-ray diffraction method with the diamond anvil cell up to 50 GPa. The Murnaghan equation of state for NiO was used to fit the experimental data with the least square method, and the equation parameters are: B0=22...
The Influences of Cool- and Hot-Pressure Treatment on the Phase Transition and Superconductivity of YBa2Cu3O7-
SUN Bao-Quan, WANG Yi-Feng, LIU Hong-Jian, LI Li-Ping, SU Wen-Hui
1990, 4(4): 246-253 . doi: 10.11858/gywlxb.1990.04.002
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Abstract:
In this paper, the influence of cool- and hot-pressure treatment were studied on the phase transition region from or thorhombic to tetragonal and superconductivity in YBa2Cu3O7-. After the cool pressure treatment of 2.2~5.2 GPa, the samples remained the orthorhombic structure, but lost their superco...
Pressure Dependence of Crystallization Temperature of a Silica Contained Oxide Ionic Glass
SHEN Zhong-Yi, CHEN Li-Quan, ZHANG Yun, YIN Xiu-Jun, LIU Yong, WANG Chao-Ying, Cros C
1990, 4(4): 254-258 . doi: 10.11858/gywlxb.1990.04.003
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Abstract:
The crystallization behavior of amorphous lithium ionic conductor 0.3Li2O-0.67SiO2-0.03V2O5 has been studied under ambient and high pressures. There were two steps for the crystallization of the amorphous material. Li2Si2O5 was formed in the first step at 560 ℃ under ambient pressure while the preci...
Perimeter-Area Relation of Fractal Island
LONG Qi-Wei
1990, 4(4): 259-262 . doi: 10.11858/gywlxb.1990.04.004
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Abstract:
The relationship of perimeter with area (P/A relation) of fractal island is discussed. It is shown that Mandelbrot's fractal relation between Koch perimeter and area does not hold in the island with finite self-similar generations. This might be the reason why the fractal dimension measured with P/A...
Effect of Hydrostatic Pressure on Lithium Ionic Conductivity in Amorphous Li+ Conductor
SU Fang, XU Wei, SU Jun
1990, 4(4): 263-269 . doi: 10.11858/gywlxb.1990.04.005
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Abstract:
Ionic conductivity and activation volume of the bulk piece and powder of amorphous lithium ionic conductor B2O3-0.7Li2O-0.7LiCl-0.10Al2O3 were investigated in the hydrostatic pressure range from 0 to 2.21 GPa. For the hydrostatic pressure dependence of ionic conductivity of the bulk piece, a prelimi...
Studies on Synthesis and Heat Resistant Character of cBN Crystals with Different Colors
ZHANG Tie-Chen, XU Xiao-Wei, GUO Wei-Li, MA Wen-Jun, GUO Xue-Bin, ZOU Guang-Tian
1990, 4(4): 270-275 . doi: 10.11858/gywlxb.1990.04.006
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Abstract:
In this paper, three types of cBN crystals with different colors were obtained under high pressure and high temperature using hBN as starting material and Mg, Mg3N2 and Mg-Mg3N2 popwders as catalysts respectively. We analysed the properties of the cBN crystals with different colors by TG-DTA and hig...
Detonation Temperature for Hydrogen-Oxygen Mixtures Using Multi-wavelength Pyrometer
LI Zhao-Ning, HU Dong, SUN Zhu-Mei, WANG Gui-Chao
1990, 4(4): 276-283 . doi: 10.11858/gywlxb.1990.04.007
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Abstract:
A multi-wavelength method that can be used to measure the detonation temperature for hydrogen-oxygen mixture in shock tube was described in this paper, with the entire field of view of the receiving fibers either filled by the gases or not. To calculate transverse temperature and longitudinal temper...
The Structure and Luminescence Characters of SrSiO3:Eu3+Bi3+ Synthesized by High Pressure and High Temperature
LIU Hong-Jian, WANG Yi-Feng, YANG Jing-Hai, LI Li-Ping, SU Wen-Hui, GUAN Zhong-Su, YU Bao-Gui
1990, 4(4): 284-290 . doi: 10.11858/gywlxb.1990.04.008
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Abstract:
The SrSiO3:Eu3+Bi3+ samples were firstly synthesized by high-pressure (HP) and high-temperature (HT) method under 3.15 GPa and 1 200 ℃. Comparing with those prepared under atmosphere pressure, the structure of the samples and the influence of pressure and temperature on the luminescence properties h...
Investigation of the Explosive Consolidations of Al-Li Alloy and Al Powders
ZHANG Deng-Xia, MA Cheng-Hui, AI Bao-Ren, ZHANG Jin-Yuan, ZHU Rui-Zhen, LIU Chun-Lan
1990, 4(4): 291-299 . doi: 10.11858/gywlxb.1990.04.009
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Abstract:
In this paper, explosive consolidation was investigated for rapidly solidified Al-Li alloy and Al powders. The density, microstructures and fracture morphologies of the sintering compacts were examined. The Al-Li alloy powder was prepared by argon gas atomization. The Al powders were prepared by wat...
The Effect of Pretreatment of Graphite on Diamond Synthesis
TANG Gong-Ben, SHI Feng, SUN Wan-Ming, CUI Shuo-Jing, SHI Chang-Huai, XIE Yun-Fen, WANG Zeng-Lin, NI Jia-Zuan
1990, 4(4): 300-304 . doi: 10.11858/gywlxb.1990.04.010
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Abstract:
This paper reports the effect of pretreatment of graphite on the diamond growth. Big size diamonds of good quality were synthesized, in which the inclusions of Ni, Mn, Co, Si were reduced and N content increased. It was found that the diamond grew on both side of catalytic disks. The pretreatment me...

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