高压物理学报

First-Principles Study of the Isostructural Phase Transition of TiN under High Pressure

CHE Li-Xin, LI Yan, CUI Tian, ZHANG Miao, NIU Ying-Li, MA Yan-Ming, ZOU Guang-Tian

2006, 20(3): 225-229 . doi: 10.11858/gywlxb.2006.03.001

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Abstract:
The equation of state, electronic and phonon band structure of TiN under high pressures have been studied using the pseudopotential plane-wave method and linear response theory within the density functional theory. The band structure with increasing pressure indicates that there is no electronic top...

Pressure Effect on Electrical Properties of a Manganate with Nominal Composition La1.0Ca2.0Mn2O7

ZHU Jia-Lin, LIU Zhen-Xing, YU Ri-Cheng, LI Feng-Ying, JIN Chang-Qing

2006, 20(3): 230-236 . doi: 10.11858/gywlxb.2006.03.002

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Abstract:
Pressure effects on electrical properties of a manganate with nominal composition La1.0Ca2.0Mn2O7, which has a layered perovskite structure as majority phase, have been investigated under hydrostatic pressures up to 1.05 GPa by using a self-clamped CuBe piston-cylinder cell. An abnormal pressure eff...

The Spectro-Studies on Micro-Mechanism of Shock Ignition for Aluminium

HU Dong, YE Song, WU Jing-He, YAN Zheng-Xin, LI Ping, SUN Zhu-Mei

2006, 20(3): 237-242 . doi: 10.11858/gywlxb.2006.03.003

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Abstract:
The aluminum powder is a high energetic material. It is added into energetic materials. The results show that the critical conditions of shock ignition for micrometer-aluminum powder relate with physical behaviour for aluminum powder. The micro-behaviour of the fast reaction for micrometer-aluminum ...

Experimental Research on Glass Transition Temperature of Polymers in Compressed CO2

LI Zhi-Yi, MENG Ting-Yu, LIU Xue-Wu, WANG Yi, HU Da-Peng

2006, 20(3): 243-248 . doi: 10.11858/gywlxb.2006.03.004

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Abstract:
Glass transition temperature (Tg) is an important characteristic parameter of polymers. The investigation of polymers' Tg in compressed CO2 is especially necessary for the application of supercritical fluids technique in polymer science. In this paper, based on creep compliance experimental principl...

Interface Treatment Method for Multi-Component Fluids Numerical Simulation

ZHANG Xue-Ying, ZHAO Ning, WANG Chun-Wu

2006, 20(3): 249-256 . doi: 10.11858/gywlxb.2006.03.005

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Abstract:
Two interface treatment methods are applied to simulate multi-component flows. A simple and robust algorithm is provided for solving Riemann problem in 2-D. At each node of a narrow strip of the interface, Riemann problems are solved using iterative numerical method. Predicted isobaric values and gh...

Experimental Study on the Stability of Hydrous Minerals in Natural Pelitic System

LI Ying, TANG Hong-Feng, LIU Cong-Qiang, ZHOU Zhi-Hua

2006, 20(3): 257-264 . doi: 10.11858/gywlxb.2006.03.006

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Abstract:
Metamorphic dehydration of subducted sediments is of importance in understanding the composition of slab-derived fluids, the mineral and isotope composition in subduction zone, which is also important for understanding the evolution of arc magmas. The stability of chlorite, sericite, amphibole and b...

Effect of Stress Anisotropy on Properties of Ferromagnetic and Antiferromagnetic Bilayer Films

RONG Jian-Hong, YUN Guo-Hong

2006, 20(3): 265-269 . doi: 10.11858/gywlxb.2006.03.007

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Abstract:
The effect of exchange anisotropy and stress anisotropy on properties of a ferromagnetic and antiferromagnetic bilayer films are investigated by ferromagnetic resonance method. It is shown that exchange anisotropy results from the unidirectional anisotropy. And stress anisotropy has large effect on ...

Analytical Model for Jet Formation in Shaped Charge with Wide Cone Angle

TAN Duo-Wang, SUN Cheng-Wei

2006, 20(3): 270-276 . doi: 10.11858/gywlxb.2006.03.008

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Abstract:
An analytical model for liner collapse and jet formation in shaped charge with wide cone angle is described. The basis of this model is planar detonation driving theory and PER jet formation theory. Based on this model an analytic shaped charge code (ASCC) is programmed and then used to calculated j...

The Reaction of Li3N-B2O3 and Mg-B2O3 under High-Temperation and High-Pressure

SU Zuo-Peng, ZHANG Tie-Chen, DU Yong-Hui

2006, 20(3): 277-280 . doi: 10.11858/gywlxb.2006.03.009

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Abstract:
The reaction of Li3N-B2O3 and Mg-B2O3 under different pressure and temperature has been studied and the phase of the resultant has been analyzed by X-ray diffraction (XRD) method. XRD results show that when the starting material is Mg-B2O3, the major production is Mg3B2O6; When the starting material...

Olivine and Pyroxene Syntheses under High Temperature and High Pressure

DU Yong-Hui, ZHANG Tie-Chen, SU Zuo-Peng, CUI Qi-Liang

2006, 20(3): 281-284 . doi: 10.11858/gywlxb.2006.03.010

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Abstract:
Olivine (Mg2SiO4) and pyroxene (MgSiO3) single crystals were synthesized under high temperature (1 000~1 500 ℃) and high pressure (2~5 GPa) using the mixed powder of magnesium oxide (MgO) and silicon dioxide (SiO2) as starting materials. Results by TEM and XRD tests showed that the products increase...

Ab Initio Studies of High-Pressure Transformations in -MnO2

LI Yu-Juan, WU Xiang, QIN Shan, WU Zi-Yu

2006, 20(3): 285-290 . doi: 10.11858/gywlxb.2006.03.011

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Abstract:
First-principle calculations of MnO2 polymorphisms (rutile-type, CaCl2-type and pyrite-type) have been carried out with the full potential linearized augmented plane wave (FPLAPW) method. Through the calculations, we predict that the rutile-type MnO2 can transform to CaCl2-type at 5 GPa, and then tr...

Pressure Effect on Geometric Structure of Ge R8 Phase and Its Electronic Properties

Lü Meng-Ya, CHEN Zhou-Wen, WANG Wen-Kui, LIU Ri-Ping

2006, 20(3): 291-295 . doi: 10.11858/gywlxb.2006.03.012

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Abstract:
The electronic structure of Ge R8 phase has been investigated by first-principles method based on plane-wave basis, using norm-conserving pseudopotential and local density approximation. The dependence of structural parameters including lattice constants, rhombohedral angle, and atomic coordinates o...

Experimental Measurement for Shock Temperature of Liquid Argon up to 33 GPa

MENG Chuan-Min, SHI Shang-Chun, HUANG Hai-Jun, JI Guang-Fu, TANG Jing-You, YANG Xiang-Dong

2006, 20(3): 296-300 . doi: 10.11858/gywlxb.2006.03.013

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Abstract:
Shock temperature of liquid argon has been measured under the shock pressure up to 33 GPa by employing the two-stage light gas gun. Impactor velocities were measured with electrical-magnetic induction system. Shock velocities and shock temperature of liquid argon were measured by using optical-fiber...

Discussion on the Improvement of the Dn() Relation of IHE

ZHAO Ji-Bo, ZHAO Feng, TAN Duo-Wang, ZHANG Guang-Sheng, PU Zheng-Mei, SUN Yong-Qiang

2006, 20(3): 301-307 . doi: 10.11858/gywlxb.2006.03.014

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Abstract:
The phase velocity and wave shape of insensitive high explosive with diverse diameter were measured. Through analyses of those data, the relation of Dn and is discussed. With the same curve, the greater of the ratio of curve, the faster the reduction of normal velocity is. So the Dn() is used in who...

Equation of State for Gold

ZOU Yong, CHEN Li-Rong

2006, 20(3): 308-312 . doi: 10.11858/gywlxb.2006.03.015

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Abstract:
A modified calculative formula for the thermal pressure is proposed and the equation of state (EOS) is obtained accordingly for gold. We compared this EOS with the other two common EOS using the experimental data for gold. The results show that the new EOS is better than the other two EOS at high te...

Comparative Research of Applicability of Four Isothermal Equations of State

HU Jing, SUN Jiu-Xun, CAI Ling-Cang

2006, 20(3): 313-321 . doi: 10.11858/gywlxb.2006.03.016

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Abstract:
It is pointed out that four equations of state are popular in literature, including Morse, Vinet, Born-Meyer (BM) and Baonza equations of state. The four equations have been applied to fit the experimental compression data of 50 materials. The optimized values of bulk modulus and its first-order pre...

The Grounding Problem in the Measurement with Manganin Pressure Gauge

WANG Wei, WANG Xiang, YE Su-Hua

2006, 20(3): 322-326 . doi: 10.11858/gywlxb.2006.03.017

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Abstract:
The manganin pressure gauge is one of the most used sensors in shock wave physics experiments. The grounding problem for the measurement of shock pressure by manganin gauge is stated and discussed in this paper. The analysis and experiments show that the incorrect grounding methods will bring large ...

A on-Line Program to Process Laser Equation of State Experimental Data

SHU Hua, FU Si-Zu, HUANG Xiu-Guang, MA Min-Xun, GU Yuan

2006, 20(3): 327-330 . doi: 10.11858/gywlxb.2006.03.018

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Abstract:
A on-line program which can process laser equation of state experimental data more effectively has been developed. The processing program can decrease random error due to manual process, and it can process data much more effectively and process experimental data on-line.

Design of the Sample Assembly for Ultrasonic Measurement at High Pressure and 300 K in Six-Side Anvil Cell

WANG Qing-Song, WANG Zhi-Gang, BI Yan

2006, 20(3): 331-336 . doi: 10.11858/gywlxb.2006.03.019

PDF (1193)

Abstract:
We introduced briefly the principle of design of sample assembly for ultrasonic measurements at high pressure, and designed a new kind of sample assembly to measure the isothermal compression of Al and Cu at 300 K. Ideal quasi-hydrostatic loading was realized, and high-quality ultrasonic signals wer...

2006 Vol. 20, No. 3

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