高压物理学报

An Ideal n=3 Phase Ca4Mn3O10 of Ruddlesden-Popper Series Obtained by Solid-State Reaction under High Pressure

YU Ri-Cheng, ZHU Jia-Lin, LI Feng-Ying, LIU Zhen-Xing, JIN Chang-Qing, LI Shu-You, I.G.Voigt Martin

2002, 16(3): 161-166 . doi: 10.11858/gywlxb.2002.03.001

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Abstract:
An ideal n=3 member of Ruddlesden Popper (RP) phase Ca4Mn3O10with a space group of I4/mmm was obtained by solid-state reaction under high pressure. This phase was studied by transmission electron microscopy. An approximate model of the structure was proposed. Simulation work was carried out based on...

Relation of Hydrostatic Pressure to Both Ionic Conductivity and Permittivity of Nanophase CaF2

SU Fang, SUN Wei, SUN Ming-Li

2002, 16(3): 167-175 . doi: 10.11858/gywlxb.2002.03.002

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Abstract:
A nanophase solid CaF2 with a clean interface and an average grain size of 14 nm was prepared by evaporating in inert gas and compacting in situ in high vacuum. Under different hydrostatic pressures ranging from 0.1 MPa to 2.20 GPa, the ionic conductivity () and permittivity () of the resulting prod...

Compressional Velocity and Attenuation in Amphibolite at 2.0 GPa and up to 1 200 ℃

YUE Lan-Xiu, XIE Hong-Sen, LIU Cong-Qiang, WU Feng-Chang

2002, 16(3): 176-182 . doi: 10.11858/gywlxb.2002.03.003

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Abstract:
Compressional wave velocity and attenuation in amphibolite collected from Kudi, Xinjiang Province were measured at high pressure (2.0 GPa) and high temperature (up to 1 200 ℃). The experimental results show that vp and Q values decrease with the increase of temperature. At the beginning of increasin...

PbTe Syntheses by High-Pressure and High-Temperature Approach

ZHU Pin-Wen, JIA Xiao-Peng, CHEN Hai-Yong, CHEN Li-Xue, LI Dong-Mei, GUO Wei-Li, MA Hong-An, REN Guo-Zhong, ZOU Guang-Tian

2002, 16(3): 183-187 . doi: 10.11858/gywlxb.2002.03.004

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Abstract:
In this paper, lead telluride was successfully synthesized by a high-pressure and high-temperature (HPHT) method. XRD results show that the samples are polycrystalline with rock salt structure. The orientation of PbTe samples is varying with the increasing synthesis pressure. Scanning electric micro...

FeS2 Ban Gap Modulation under Pressure Perturbation

XIAO Qi, QIU Guan-Zhou, HU Yue-Hua, WANG Dian-Zuo

2002, 16(3): 188-193 . doi: 10.11858/gywlxb.2002.03.005

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Abstract:
The electronic structure of iron pyrite FeS2 under external pressure was studied using self-consistent pseudopotential method based on density functional theory. The results indicate that, with compressibility increasing, the width of band gap becomes wider, and that the interaction between Fe d ele...

Application of T-p Distribution to Equation of State at High Pressures

GENG Hua-Yun, WU-Qiang, TAN Hua

2002, 16(3): 194-198 . doi: 10.11858/gywlxb.2002.03.006

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Abstract:
A new framework for equation of state in which pressure is as an independent variable are discussed simply by using a T-p distribution in this paper. Then applications of this distribution to the free volume model and Harmonic oscillator model for liquid are given. The Wu-Jing parameters for these t...

One-Dimensional Numerical Simulations of Underwater Spherical Explosions

LIANG Long-He, CAO Ju-Zhen, WANG Yuan-Shu

2002, 16(3): 199-203 . doi: 10.11858/gywlxb.2002.03.007

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Abstract:
The characteristics of underwater explosions such as pulsation law and pulsation cycle of bubbles, and pressure time histories of shock waves in water were investigated numerically. Numerical results of the characteristics are given in this paper.

High-Resolution Eulerian Hybird Algorithm for Multi-Component Compressible Materials

BAI Jing-Song, CHEN Sen-Hua, ZHONG Min

2002, 16(3): 204-212 . doi: 10.11858/gywlxb.2002.03.008

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Abstract:
A series of dynamic equations applicable for the interfacial vicinity of the multi-component compressible material were derived in this paper. Both the equations describing the material interface quality and the conservative Euler equations are incorporated and solved by using a high-resolution fini...

Theoretical Calculation for Shock Compressional Properties of Liquid Nitrogen

MENG Chuan-Min, SHI Shang-Chun, DONG Shi, SUN Yue, JIAO Rong-Zhen, YANG Xiang-Dong

2002, 16(3): 213-216 . doi: 10.11858/gywlxb.2002.03.009

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Abstract:
For the liquid nitrogen, the modified WCA fluid perturbation theory is used to calculate the shock pressure and shock temperature with the exp-6 reference potential. The theory is generalized from multi-component system by adding the molecular dissociation fraction, which is related to volume. The t...

Study on the Shock Compression Properties of Mixed Liquid N2 and CO

SUN Yue, MENG Chuan-Min, WU Guo-Dong, YANG Xiang-Dong

2002, 16(3): 217-223 . doi: 10.11858/gywlxb.2002.03.010

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Abstract:
The shock compression properties of a mixture of liquid N2 and CO mixed in equal volume were studied using a two-stage light gas gun. Five Hugoniot data were measured within 10～25 GPa. Comparing with known Hugoniot curves of simple substance N2 and CO, we found that the Hugoniot curve of mixture was...

Study of -FeSi2 at High Pressure

LI Yan-Chun, LIU Jing, CAO Li-Min, DONG Yu-Hui, LI Xiao-Dong, NAN Yun, GAO Zhen-Shan, WANG Wen-Kui

2002, 16(3): 224-226 . doi: 10.11858/gywlxb.2002.03.011

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Abstract:
The structure transformation of -FeSi2 at high pressure with Diamond Anvil Cell Apparatus was firstly studied by using in situ synchrotron radiation X-ray diffraction. Phase transition was found to be appeared at 4.3 GPa and completed at 25.8 GPa. After indexed, it is shown that the product of phase...

The Effect of MgO on Growth of cBN in the Mg-hBN System

WANG Xian-Cheng, ZHANG Tie-Chen, JIA Xiao-Peng, ZOU Guang-Tian

2002, 16(3): 227-230 . doi: 10.11858/gywlxb.2002.03.012

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Abstract:
In this paper, we report a method with which yellow cBN crystals are synthesized successfully. hBN is used as raw material and magnesium powder as catalyzer. MgO is added appropriately at high pressure (5.0 GPa) and high temperature (1 500～1 800 K) with cubic anvil high-pressure apparatus. The synth...

Ferroelectric/Antiferroelectric Phase Transition Studies of PZT-95/5 Ceramics under Shock Loading

LIU Gao-Min, TAN Hua, YUAN Wan-Zong, WANG Hai-Yan, ZHANG Yi

2002, 16(3): 231-236 . doi: 10.11858/gywlxb.2002.03.013

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Abstract:
Shock-induced phase transition in PZT-95/5 ferroelectric ceramics was studied by using X-cut quartz gauge. The stress profile measured shows definitely a two-wave structure which indicates that the FE/AFE phase transition starts at stress about 0.5 GPa. SEM observations for the pre-shock green sampl...

The Bandwidth of Optical Fiber and Its Restrictions on VISAR

PENG Qi-Xian, MA Ru-Chao, LI Ze-Ren, LIU Jun, LIU Yuan-Kun, DENG Xiang-Yang

2002, 16(3): 237-240 . doi: 10.11858/gywlxb.2002.03.014

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Abstract:
The effects of the optical fiber bandwidth on VISAR system were investigated. It was estimated that the index-stepped multi-mode optical fiber could only reach a bandwidth of several MHz#8226;km while the index-graded optical fiber could easily reach a bandwidth of several GHz#8226;km. The experimen...

2002 Vol. 16, No. 3

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