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

2007 Vol. 21, No. 3

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Electronic Behaviors of the Rocksalt and Monoclinic AgCl under Pressure
WANG Zuo-Cheng, CHE Li-Xin, LI Yan, CUI Tian, ZHANG Miao, NIU Ying-Li, MA Yan-Ming, ZOU Guang-Tian
2007, 21(3): 225-230 . doi: 10.11858/gywlxb.2007.03.001
PDF (918)
Abstract:
The structural behavior and the electronic properties of AgCl under pressure are extensively studied by using the pseudopotenial plane-wave method and generalized gradient approximation within density functional theory. The theoretical transition pressure corresponding to the phase transition from r...
Experimental Studies on Air Drag Coefficient of Spherical Tungsten Fragments
TAN Duo-Wang, WANG Guang-Jun, GONG Yan-Qing, GAO Ning
2007, 21(3): 231-236 . doi: 10.11858/gywlxb.2007.03.002
PDF (1096)
Abstract:
The air drag coefficients of spherical tungsten fragments are studied. The fragment includes ideal sphere and real fragment formed by a warhead. The experimental results show that: (1) for ideal spheres, the attenuation coefficient of velocity is constant, the air drag coefficient is slightly affect...
Synthesis and Characterization of h-BCN Nanocrystallite under High-Pressure and High-Temperature
LI Xue-Fei, ZHANG Jian, SHEN Long-Hai, YANG Da-Peng, CUI Qi-Liang, ZOU Guang-Tian
2007, 21(3): 237-241 . doi: 10.11858/gywlxb.2007.03.003
PDF (993)
Abstract:
h-BCN compounds were synthesized with C3H6N6 and B2O3 as raw materials, combined with heat treatment, high pressure and high temperature. An amorphous BCN precursor was prepared at 1 100 K under vacuum. Annealed for 30 min, at 1 500 K under 5.0 GPa, the amorphous BCN precursor crystallizes into hexa...
Study on Penetration of Concrete Targets by Ogive-Nose Steel Projectile
ZHOU Ning, REN Hui-Qi, SHEN Zhao-Wu, HE Xiang, LIU Rui-Chao
2007, 21(3): 242-248 . doi: 10.11858/gywlxb.2007.03.004
PDF (911)
Abstract:
We conducted acceleration-time measurement of penetration experiments in targets with 100 mm diameter, 4.0 caliber-radius-head, 25 kg projectiles. The 3 m3 m3m and 2 m2 m2m concrete targets had an nominal unconfined compressive strength of 35 MPa and density 2 450 kg/m3. Projectiles were designed to...
Structure and Ferroelectric Properties of Dense Nanocrystalline BaTiO3 Ceramics Prepared by High Pressure Sintering Method
LI Peng-Fei, JIN Chang-Qing, XIAO Chang-Jiang, PAN Li-Qing, WANG Xiao-Hui
2007, 21(3): 249-252 . doi: 10.11858/gywlxb.2007.03.005
PDF (970)
Abstract:
Dense nanocrystalline BaTiO3 ceramics with a grain size of 50 nm were prepared under 6 GPa at 1 000 ℃ using a high pressure sintering method. The sintered bulk is uniform and the relative density is above 97%. We annealed the ceramic samples in oxygen to eliminate the oxygen vacancies caused by high...
An Improved of Experimental Hypervelocity Launcher and Simulation
BAI Jing-Song, TANG Mi, HUA Jing-Song, LI Ping, TAN Hua
2007, 21(3): 253-258 . doi: 10.11858/gywlxb.2007.03.006
PDF (884)
Abstract:
A numerical simulation method for calculation of the three-stage light-gas gun impacts on launch flier to hypervelocity is presented. Based on multi-fluid volume of fraction (VOF) and parabolic piecewise method (PPM), a multi-fluid parabolic piecewise method (MFPPM) shock wave physics code is develo...
Investigation of in Situ Raman Spectrum and Electrical Conductivity of PbMoO4 at High Pressure
YU Cui-Ling, YU Qing-Jiang, GAO Chun-Xiao, LIU Bao, HE Chun-Yuan, HUANG Xiao-Wei, HAO Ai-Min, ZHANG Dong-Mei, CUI Xiao-Yan, LIU Cai-Long, et al.
2007, 21(3): 259-263 . doi: 10.11858/gywlxb.2007.03.007
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Abstract:
PbMoO4, with high acousto-optic figure of merit, low acoustic loss and nicer acoustic impedance matching, has received much attention because of applications as acousto-optic deflector, modulator, adjustable filter, suface acoustic wave devices and great potential to act as an effective low-temperat...
Investigation of Phase Transitions of ZrO2 under High-Pressure and High-Temperature Conditions by Raman Spectroscopy
ZHANG Hong, XIAO Wan-Sheng, TAN Da-Yong, LUO Chong-Ju, LI Yan-Chun, LIU Jing
2007, 21(3): 264-268 . doi: 10.11858/gywlxb.2007.03.008
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Abstract:
Using argon as a pressure medium, the phase transitions of monoclinicstructured ZrO2 under high-pressure and high-temperature have been investigated by means of in situ Raman spectra method and a laser-heated diamond anvil cell (DAC). At room temperature, the baddeleyite-type ZrO2 begins to transfo...
Modified Einstein Model to Consider Thermal Effect and Applied to Three Universal Equations of State
ZHANG Chao, SUN Jiu-Xun, TIAN Rong-Gang, LI Ming
2007, 21(3): 269-278 . doi: 10.11858/gywlxb.2007.03.009
PDF (890)
Abstract:
The Einstein model to consider thermal effect in universal equations of state (UEOS) is modified. It is proposed that the zero-point vibration term should be deleted in a thermal UEOS, and the parameters can not be directly taken as experimental data at a reference temperature, VR, BR, BR and GR, bu...
Energy Dispersive X-Ray Powder Diffraction of Natural Enstatite under High Pressure Conditions
MA Mai-Ning, ZHOU Wen-Ge, LIU Jing, LI Yan-Chun, LI Xiao-Dong
2007, 21(3): 279-282 . doi: 10.11858/gywlxb.2007.03.010
PDF (924)
Abstract:
Using synchrotron radiation and diamond anvil cell (DAC) in high pressure research station of Beijing Synchrotron Radiation Facility (BSRF), energy dispersive X-ray powder diffraction (EDXD) of the natural enstatite collected from Damapin in Hebei Province, have been in situ measured under room temp...
Phase Evolution of Zr-Based Bulk Metallic Glass Prepared by Shock-Wave Quenching under High Temperature and High Pressure
YANG Chao, CHEN Wei-Ping, ZHAN Zai-Ji, JIANG Jian-Zhong
2007, 21(3): 283-288 . doi: 10.11858/gywlxb.2007.03.011
PDF (1172)
Abstract:
Phase evolution (PH) of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass (BMG) prepared by shock-wave quenching has been studied under high-temperature and high-pressure using in situ synchrotron radiation energy-dispersive X-ray diffraction. The results show that the primarily precipitated phase is Zr2...
Constitutive Behaviors of a Silicone Rubber at High Strain Rates
LIN Yu-Liang, LU Fang-Yun, LU Li
2007, 21(3): 289-294 . doi: 10.11858/gywlxb.2007.03.012
PDF (967)
Abstract:
Silicone rubber is a macromolecule polymer, and can suffer a large deformation. The silicone rubber specimens are tested at a series of strain rates by modified Split Hopkinson Pressure Bar (SHPB) techniques. Based on the experimental data, a constitutive model of the silicone rubber is built up bas...
Chemical Synthesis and Characterization of Flaky h-CN by HPHT
YANG Da-Peng, LI Ying-Ai, DU Yong-Hui, SU Zuo-Peng, JI Xiao-Rui, YANG Xu-Xin, GONG Xi-Liang, ZHANG Tie-Chen
2007, 21(3): 295-298 . doi: 10.11858/gywlxb.2007.03.013
PDF (1146)
Abstract:
Hexagonal boron carbonitrogen (h-BCN) crystal was synthesized from the mixture of boron powder and CNH compound prepared by pyrolysis of Melamine (C3H3N3) under high temperature (1 400~1 500 ℃) and high pressure (5.0~5.5 GPa). X-ray photoelectron spectroscopy and Fourier transform infrared spectrosc...
First Principles Study of the Elastic, Electronic and Optical Properties of CdO under Pressure
HE Kai-Hua, ZHENG Guang, CHEN Gang, Lü Tao, WAN Miao, XIANG Dong, JI Guang-Fu
2007, 21(3): 299-304 . doi: 10.11858/gywlxb.2007.03.014
PDF (911)
Abstract:
The structural, elastic, electronic and optical properties of CdO under high pressure were studied by plane wave pseudo-potential method which based on the density functional theory. The generalized gradient approximation and local density approximation were used to describe the exchange-correlation...
Direct Hydrothermal Synthesis and Luminescence Property of Titanate Nanotubes Doped with Eu3+ Ions
SONG Gong-Bao, WANG Mei-Li, MIAO Lan-Dong, LI Jian, ZHANG Bao-Shu
2007, 21(3): 305-310 . doi: 10.11858/gywlxb.2007.03.015
PDF (760)
Abstract:
Pure titanate nanotubes and titanate nanotubes doped with Eu3+ ions were synthesized by hydrothermal method. In this process, the preparation of nanotubes is synchronously finished by doping with Eu3+ ions. The morphology, structure, thermal stability and luminescence property of titanate nanotubes ...
Ballistic Limit Analysis for Projectiles Impacting on Dual Wall Structures at Hypervelocity
DING Li, ZHANG Wei, PANG Bao-Jun, LI Can-An
2007, 21(3): 311-315 . doi: 10.11858/gywlxb.2007.03.016
PDF (999)
Abstract:
The potential threat from meteoroids and orbital debris particles impacting on pressurized spacecraft prompted a study of ballistic limit analysis. The paper presents a new analytical ballistic limit equation for sphere projectiles normal impacting on thin plates. This equation applies to cases of h...
Effect of Diamond Films Thickness on Thermal Residual Stress
TANG Da-Pei, GAO Qing, WU Lan-Ying
2007, 21(3): 316-321 . doi: 10.11858/gywlxb.2007.03.017
PDF (877)
Abstract:
Each component of thermal residual stress in diamond films deposited onto Mo substrate was simulated and analyzed comprehensively by using the finite element method, and the different thickness (20~1 000 m) of the films was used during the simulation. The contour plots of these components distributi...
Study on the Mechanism of PZT95/5 Powder Synthesis by Shock Waves
WANG Jun-Xia, YANG Shi-Yuan, HE Hong-Liang, WANG Jin
2007, 21(3): 322-326 . doi: 10.11858/gywlxb.2007.03.018
PDF (876)
Abstract:
A cylinder shock-wave recycling device was used, and via impacting effects of explosive shock waves, PZT95/5 powders were synthesized from a mixture of Pb3O4, ZrO2, and TiO2 oxides. Based on the XRD analyses of recovered powders and shock wave theory, the synthesis mechanism and process of PZT powde...
Experimental Validation of Quasi-Elastic Response of Metal during Reloading Process
SONG Ping, ZHOU Xian-Ming, YUAN Shuai, LI Jia-Bo, WANG Xiao-Song
2007, 21(3): 327-331 . doi: 10.11858/gywlxb.2007.03.019
PDF (1012)
Abstract:
An uniaxial strain experiment of a magnesium alloy (brand:MB2) disk under shock loading and reloading was designed by a wave reflection method. Time-resolved interfacial velocity between the MB2 sample and a LiF window was measured by a VISAR (Velocity Interferometer System for Any Reflection) probe...
Research on Using Raman Spectra of Carborundum Anvil as Pressure Sensor at Pressure of 0.1~3 000 MPa
QU Qing-Ming, ZHENG Hai-Fei
2007, 21(3): 332-336 . doi: 10.11858/gywlxb.2007.03.020
PDF (1008)
Abstract:
The 6H carborundum anvil is used in the Mao-Bell hydrothermal diamond anvil cell, and the Raman spectra of different positions of the surface of the anvil under different pressures were measured. The pressures were calculated by using the R1 line of the ruby which was positioned in the cell. Then we...

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