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

1987 Vol. 1, No. 1

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Mechanism for the Metallization of Solid Hydrogen under High Pressure
GOU Qing-Quan
1987, 1(1): 3-6 . doi: 10.11858/gywlxb.1987.01.001
PDF (881)
Abstract:
A mechanism for the metallization of solid hydrogen under high pressure is proposed on the basis of the theoretical analysis on the structural change of hydrogen molecule in solid state at high pressures. The experimental results from H. K. Mao, et al., about the Raman shifts of solid hydrogen under...
Design Criterion for Ramp Wave Generator
JING Fu-Qian, LU Jing-De, LIU Cang-Li
1987, 1(1): 7-12 . doi: 10.11858/gywlxb.1987.01.002
PDF (716)
Abstract:
A design criterion for ramp wave generator is derived in this paper, which may be expressed as -[(2/3)+(g/2)] or -[(2/3)+(g/2)](cV/c2) (here is Grneisen coefficient, thermal expansion coefficient, c hydrodynamic sound speed, cV specific heat capacity at constant volume, g a material constant). Exper...
Self-Consistent LMTO Calculations of the Equation of State at Zero Temperature for Copper
ZHANG Wan-Xiang, ZHANG Chun-Bin, LI Shao-Meng, CHEN Hao
1987, 1(1): 13-21 . doi: 10.11858/gywlxb.1987.01.003
PDF (722)
Abstract:
By using the self-consistent LMTO method which is built on the framework of density functional theory, the equation of state of fcc copper at zero temperature is calculated tin the region of compression ratio from 1 to 4.5. The comparisons of our results with those obtained by two semiempirical meth...
Pressure Behaviours of N and NNi Traps in Gap
ZHAO Xue-Shu, LI Guo-Hua, YANG Gui-Lin, WANG Bing-Sang, HAN He-Xiang, WANG Zhao-Ping, TANG Ru-Ping, HU Jing-Zhu, WANG Li-Jun
1987, 1(1): 22-31 . doi: 10.11858/gywlxb.1987.01.004
PDF (620)
Abstract:
It has been well known that localized electronic states in semiconductors are closely related to the electronic band structure. In fact, exploration of the interrelation between localized electronic states and the band structure represents a basic aspect of the electronic theory of semiconductors. T...
Elastic Behaviour of the Gadolinium Gallium Garnet Crystal under High Pressure
WANG Ru-Ju, WANG Ji-Fang
1987, 1(1): 32-38 . doi: 10.11858/gywlxb.1987.01.005
PDF (726)
Abstract:
By means of the pulse echo overlap method, we have measured the velocities of ultrasonic wave propagating along different crystalline axes of the Gadolinium Gallium Garnet crystal (GGG). We have also measured the changes of the velocities with hydrostatic pressures and uniaxial stresses respectively...
Phase Transitions of Ge and Si under High Pressure
JIN Bi, ZHU Zai-Wan
1987, 1(1): 39-49 . doi: 10.11858/gywlxb.1987.01.006
PDF (972)
Abstract:
The covalent-metallic phase transitions of Ⅳ group elements (Ge, Si) are investigated in terms of pseudopotential theory. The calculated values of the pressure-volume relations. The transition pressure, the volume discontinuity and the superconducting transition temperature of the metallic phase sho...
Molecular Dynamics Simulation of Polymorphous Transitions
CHEN Dong-Quan, XIE Guo-Qiang
1987, 1(1): 50-57 . doi: 10.11858/gywlxb.1987.01.007
PDF (824)
Abstract:
In this paper, temperature-induced polymorphous transitions for KCl and NaCl crystals at ＝0 are investigated using a molecular dynamics method. The change of the radial distribution function with temperature indicates that there occurs the structural transition from bcc to fcc. In order to choose po...
Monte-Carlo Investigation of Interaction of Relativistic Electron-Beam with Solid and Calculation of Its Mechanical Effects
YU Wan-Rui, ZHANG Ruo-Qi, LIU Ge-San
1987, 1(1): 58-70 . doi: 10.11858/gywlxb.1987.01.008
PDF (602)
Abstract:
The transport behaviour of electrons in alloy and composite materials is described and calculated in this paper. Investigations on the distribution of scattering angle and the energy loss are made. The calculation for the effects of the knock-on electrons and the spatial distribution of the electron...
An Investigation on Electric Properties of the Polyaniline Complexes under High Pressure
CUI Shuo-Jing, XU Da-Peng, SU Wen-Hui, WANG Fu-Song, WANG Sheng-Long
1987, 1(1): 71-75 . doi: 10.11858/gywlxb.1987.01.009
PDF (826)
Abstract:
Electric properties of the polyaniline with large conjugated -bonds have been studied under high pressure. It shows that a minimum of electric resistance-pressure curve for the PAn-H+ occurs at p=3.2 GPa, which suggests that the PAn-H+ may be used as a pressure-calibration material of p=3.2 GPa. And...
Synthesis of Jewelry Jadeite at High Pressure and High Temperature
YAN Xue-Wei, MA Xian-Feng, NI Jia-Zan, QIAN Zheng-Nan, WANG Yi-Feng, SU Wen-Hui
1987, 1(1): 76-80 . doi: 10.11858/gywlxb.1987.01.010
PDF (768)
Abstract:
The synthesis of jewelry jadeite at pressures of 2.0~4.5 GPa and temperatures of 900~1 450 ℃ is described in this paper. The size of the synthetic jadeite is about 83 mm. The jadeite was synthesized from jadeite glass made at 1 350~1 550 ℃. By adding certain amounts of Cr3+, Cu2+, Co3+ cations, jade...
Experimental Studies on the Overdviven Detonation Events in Condensed Explosives
LI Da-Hong
1987, 1(1): 81-87 . doi: 10.11858/gywlxb.1987.01.011
PDF (657)
Abstract:
Maximum detonation pressure of 2.5 times than its C-J value was obtained in TNT/RDX (40/60) by using planar flyer impact technique. The equation of state of overdriven detonation product was derived as the form of p=Ak+A1(p-pJ) (p－detonation pressure, GPa, －density, kg/m3, A=J/kJ, pJ=27.06 GPa, J=2....
Mass Ejection from Free Surface of Shock-Loaded Metallic Plates
ZENG Jian-Rong, ZHUANG Yi-He
1987, 1(1): 88-92 . doi: 10.11858/gywlxb.1987.01.012
PDF (700)
Abstract:
The mass ejection from free surfaces of aluminum alloy (Ly-12) and lead specimens under shock loading were measured using the piezelectric quartz crystal gauge technique. At shock pressure of 32 GPa, the ejected mass quantites of aluminum alloy with respec to the surface smooth finishes of 3.2 0.4 a...
Compressibility and Phase Transition of PZT-95/5 Ferroelectric Ceramics at High Pressure
BAO Zhong-Xing, GU Hui-Cheng, ZHANG Zhi-Ting
1987, 1(1): 93-96 . doi: 10.11858/gywlxb.1987.01.013
PDF (690)
Abstract:
Using the experimental method established by the authors, the p-V relationships and the irreversible phase transition for PZT 95/5 ferroelectric ceramics have been studied at room temperature during the first, second and third compression up to 4.5 GPa.

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