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

1998 Vol. 12, No. 2

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Some Problems of Fracture Waves in Brittle Materials under Shock Loading
ZHANG Guan-Ren
1998, 12(2): 81-86 . doi: 10.11858/gywlxb.1998.02.001
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Abstract:
In this paper, some problems of fracture waves in glasses and rocks under shock loading are discussed, such as whether its formation mechanism is crack growth or phase transformation, why it begins from the surface of glasses, and what is its propagation velocity.
The Three-Body and Four-Body Interactions between Hydrogen Molecules at High Temperatures and Densities
LIU Fu-Sheng, CAI Ling-Cang, JING Fu-Qian
1998, 12(2): 87-91 . doi: 10.11858/gywlxb.1998.02.002
PDF (661)
Abstract:
To describe the complicate three-body and four-body interactions between hydrogen molecules at high temperatures and densities, an effective helium-atom model is presented to approximate electron cloud distribution of rotating hydrogen molecule at the outer space, on the basis of the average pair po...
The Structure and Phase Transition for CsBr under Ultra-High Pressure
WANG Li-Jun, CHEN Liang-Chen, LI Feng-Ying, GU Hui-Cheng, ZHOU Lei, CHE Rong-Zheng
1998, 12(2): 92-96 . doi: 10.11858/gywlxb.1998.02.003
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Abstract:
In situ energy dispersive X-ray diffraction measurements on CsBr under pressure up to 115 GPa have been performed by using pressure device－diamond anvil cell (DAC) with synchrotron source. It is determined that the structure of CsBr is changed from simple cubic phase to tetragonal phase at about 53 ...
In-Situ Measure and Control of Oxygen Fugacity at High-Temperature and High-Pressure
LI He-Ping, XIE Hong-Sen, GUO Jie, ZHANG Yue-Ming, XU Zu-Ming, XU Ji-An
1998, 12(2): 97-102 . doi: 10.11858/gywlxb.1998.02.004
PDF (536)
Abstract:
By inserting a solid oxygen-specific electrolyte between a sample and an oxygen reservoir, and applying a DC power between the oxygen reservoir and the sample oxygen can be pumped out from or poured into the sample in situ independent of temperature and pressure. By installing an oxygen sensor into ...
Phase Evolution of Germanium during Solidification at High Pressure
HE Duan-Wei, LI Jiao-Jun, ZHANG Fu-Xiang, ZHANG Ming, LIU Ri-Ping, XU Ying-Fan, WANG Wen-Kui
1998, 12(2): 103-108 . doi: 10.11858/gywlxb.1998.02.005
PDF (789)
Abstract:
In this paper the phase evolution in the solidification process of germanium under high pressure is investigated. Data obtained on electrical resistance changes, and in situ differential thermal measurements, as well as X-ray diffraction results enable us to arrive at the phase relations and transfo...
A Discussion on the Errors for the in Situ Magnetic Measurements in Hydrostatic High Pressure Vessel (2)－The Influence of Demagnetic Field
SU Fang, SU Xiao
1998, 12(2): 109-114 . doi: 10.11858/gywlxb.1998.02.006
PDF (634)
Abstract:
To study the influence of demagnetic field in the hydrostatic high pressure vessel, we selected 6 samples with different slice-number (n=1, 3, 5, 7, 10, 13) of amorphous alloy Fe46.3Co0.03Ni46.5Si3.75V0.92B2.5 ribbon, inserted them into multiple electric solenoid and measured the magnetization, magn...
The Synthesis of Sr1-xLaxTiO3 under High-Temperature and High-Pressure and Its XPS Study
LU Da-Yong, LI Li-Ping, CHE Yu-Lu, MIAO Ji-Peng, LIU Hong-Jian, SU Wen-Hui
1998, 12(2): 115-119 . doi: 10.11858/gywlxb.1998.02.007
PDF (593)
Abstract:
The perovskite oxides, Sr1-xLaxTiO3, were synthesized at high-temperature and high-pressure. XRD measurement shows that the samples with x0.5 are in single phase and belong to cubic phase structure. Cell volume increase at beginning of x, then decrease at x=0.4. XPS analysis indicates that Ti ions a...
A Theoretical Study on the Equation of State of Liquid Methane at High Temperature and High Densities
YANG Xin-Dao, LIU Fu-Sheng, LI Jian-Feng, JING Fu-Qian
1998, 12(2): 120-124 . doi: 10.11858/gywlxb.1998.02.008
PDF (772)
Abstract:
Equation of state and molecular dissociation reactions of liquid methane at high-temperature and high-pressure are investigated by Statistical Mechanics and Chemical Equilibrium method, with focus on the interactions between CH4 and H2, which apparently would affect the equilibrium of chemical react...
Temperature Changes with Time of Synthesizing Diamond by Low-Frequency Heating
XU Hong-Shan, CHEN Yu-Fei, WANG Yan-Di
1998, 12(2): 125-128 . doi: 10.11858/gywlxb.1998.02.009
PDF (724)
Abstract:
The effect of synthesizing diamond under high temperature and high pressure by low-frequency (50 Hz) heating differs from that of by industrial frequency heating. For industrial frequency heating, the constant heat is imported into the cell and the temperature is a spatial l distribution, while for ...
Effect of Different Preservative Substances on the Formation of Condensed Carbon in Detonation
CHEN Quan, MA Feng, CHEN Peng-Wan, YUN Shou-Rong, HUANG Feng-Lei
1998, 12(2): 129-133 . doi: 10.11858/gywlxb.1998.02.010
PDF (646)
Abstract:
In this paper, the comparison of the effect of different preservative materials on preserving the condensed carbon obtained from detonation soot shows that the surrounding substance has prominent importance on the formation of condensed carbon in detonation which not only take a preservative effect ...
Pressure Measurement Techniques in Electrothermal-Chemical Gun
LI Hong-Tao, QIU Xu, RUI Hai-Yan, CHEN Lin
1998, 12(2): 134-140 . doi: 10.11858/gywlxb.1998.02.011
PDF (708)
Abstract:
This article reports the measurement method of the pressure in-bore with high transient and broad spectra. It also presented how to resist the strong electromagnetic disturbances. The measurement method includes the acoustical filter and optic-electric separation techniques. The quartz and the PVDF ...
Diamond Synthesis Using VC as Carbon Source
LI Liang-Bin, JIANG Jin-Chun, YANG Xin-Dao, ZHONG Yu-Mao, ZHANG Xin-Yuan, HONG Shi-Ming
1998, 12(2): 141-144 . doi: 10.11858/gywlxb.1998.02.012
PDF (623)
Abstract:
A system of VC powder and Ni70Mn25Co5 alloy in weight ratio of 1∶6 was treated under high pressure of 6.0 GPa and high temperature of 1 500 ℃ for 20 min. X-ray diffraction of the sample indicates that diamond and graphite formed respectively with decomposition of the VC. Observation in SEI, WDX and ...
Theoretical Isothermal Compression Curve for Solid Helium
CAI Ling-Cang, LIU Fu-Sheng, JING Fu-Qian
1998, 12(2): 145-149 . doi: 10.11858/gywlxb.1998.02.013
PDF (680)
Abstract:
Based on the theory of atomic cluster and taking account of the screening effects induced by nearest-neighbor and next nearest-neighbor atoms, we have calculated the many-body repulsive potential and isothermal compression curve for solid helium with hcp lattice configuration. The calculation result...
Ultrasonic Measurements and Mechanical Parameters Evaluation for Tungsten Alloy
HUA Jin-Song, JING Fu-Qian, TAN Hua, ZHAO Zhi-Dan
1998, 12(2): 150-155 . doi: 10.11858/gywlxb.1998.02.014
PDF (578)
Abstract:
Longitudinal and transversal sound velocities of 93W alloy were measured by using a belt type and a cubic-type high pressure apparatus, respectively. Results show that under normal temperature and pressure conditions, this tungsten alloy materials have a longitudinal velocity (cL) of 5.135 km/s and ...
The Effect of the Confinement Condition upon the Corner Effect in Cast TNT
LI Sheng-Cai, ZHAO Tong-Hu, FENG Chang-Gen
1998, 12(2): 156-159 . doi: 10.11858/gywlxb.1998.02.015
PDF (860)
Abstract:
In this paper, detonation wave corner-turning in cast TNT was studied by means of electric probe technique. The relative delay time of wave arrival in various directions was measured under different confinement condition. The results show that the relative delay time can be reduced by means of (1) u...

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