高压物理学报

Shock Temperature Measurements for Metals－Release Approximation at the Interface

TAN Hua

1996, 10(3): 161-169 . doi: 10.11858/gywlxb.1996.03.001

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Abstract:
In radiometry measurements of shock temperatures for metals, release processes occurring at the metal/window interface affect substantially the final state of the tested sample, especially when release-induced melting happens. In this paper, the author describes in detail how to use a super-heating ...

Synthesis of Boron-Rich Boride NdB6 under High Pressure and High Temperature

ZHAO Xu-Dong, LIN Feng, LIU Xiao-Yang, HOU Wei-Min, LIU Wei-Na, SU Wen-Hui

1996, 10(3): 170-175 . doi: 10.11858/gywlxb.1996.03.002

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Abstract:
A new route is reported to prepare boron-rich rare-earth boride NdB6 under extreme of high pressure and high temperature conditions, i.e. oxidizing amorphous elemental boron with rare-earth oxide Nd2O3. Products are analyzed by X-ray powder diffraction. Results show that the pure phase of NdB6 is ob...

The X-Ray Diffraction Studies of -Fe2O3 Ultrafine Particles Treated by High Pressure

LI Hai-Bo, ZHENG Wei-Tao, GONG Jie, ZUO Yun-Tong, YU Rui-Huang

1996, 10(3): 176-181 . doi: 10.11858/gywlxb.1996.03.003

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Abstract:
-Fe2O3 ultrafine particles were prepared with precipitation method and treated by high pressure at various temperatures. The samples were studied by X-ray, TEM and Mossbauer spectroscopy. The results indicate that the high pressure has no obvious influence on the size of microcrystals at room temper...

The Luminescence Properties and High Pressure Research of LaOBr:Tb3+, Dy3+

YANG Jing-Hai, LI Yong-Ji

1996, 10(3): 182-189 . doi: 10.11858/gywlxb.1996.03.004

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Abstract:
The rare earth luminescence materials LaOBr:Tb3+, Dy3+ were synthesized at high temperature, and were treated by high pressure (HP) combined with high temperature (HT). The luminescent properties of the samples before and after HP and HT treatment were studied. The results show that codoping Dy3+ ma...

Experimental Investigation of a Contactless Coilgun for 60 mm Projectiles

GAO Shun-Shou, SUN Cheng-Wei, CHEN Ying-Shi, DAI Ying-Min, WANG Min-Hua

1996, 10(3): 190-198 . doi: 10.11858/gywlxb.1996.03.005

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Abstract:
A contactless coilgun for 60 mm projectiles has been designed, fabricated and tested, which can accelerate l kg projectiles from rest to 60 m/s. The basic coilgun configuration and control system are described. Comparison between test results and computer code predictions are presented. The device p...

Shock Activation and Modification of PZT-95/5 Piezoceramics

LIU Li, HAN Jun-Wan

1996, 10(3): 199-208 . doi: 10.11858/gywlxb.1996.03.006

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Abstract:
This paper is about shock activation and modification of PZT-95/5 ceramics. The shock loading experiments of PZT-95/5 powder and block samples show that: in suitable conditions, the density (), piezoelectric strain constant (d33) and dielectric constant () of the samples can be increased and dielect...

Research on X-Ray Radiation Field Which Is from a Outer Space Nuclear Explosion

WANG Shang-Yi, ZHANG Ruan-Yu, CHEN Le-Shan

1996, 10(3): 209-214 . doi: 10.11858/gywlxb.1996.03.007

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Abstract:
X-ray is regarded as the main damage factor of nuclear interception in outerspace. A mathematical mode of X-ray radiation field which is from a nuclear explosion is needed in the spacecraft radiation damage calculation. According to Planck blackbody spectrum, we proposed a compound mode of normolize...

Geometrical Statistics and Fractal Method for the Fragment Distribution of Dynamic Loading

ZHANG Guan-Ren

1996, 10(3): 215-219 . doi: 10.11858/gywlxb.1996.03.008

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Abstract:
In this paper, two statistical Methods for the fragment distribution of dynamic loading are introduced. The one is the Mott formula generalized by Grady and Kipp, the other is the fractal method. The author has proved that the two methods are in agreement with each other, that the latter can be dedu...

Optic Radiations and Chemical Reactions in Bromoform under Shock Compressions

HU Jin-Biao, TAN Hua, JING Fu-Qian

1996, 10(3): 220-226 . doi: 10.11858/gywlxb.1996.03.009

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Abstract:
Multi-channel optic pyrometer was used to observe shock temperatures of bromoform in the pressure range from 37 to 85 GPa and thermal relaxation behavior at bromoform/sodium chloride crystal interface. The radiation time histories from shocked bromoform exhibit a two-step structure as the pressure r...

Phase Transition of Pb0.8Sn0.2Te Crystal under High Pressure

GU Hui-Cheng, CHEN Liang-Chen, BAO Zhong-Xing, LI Feng-Ying

1996, 10(3): 227-230 . doi: 10.11858/gywlxb.1996.03.010

PDF (824)

Abstract:
Phase transitions of Pb0.8Sn0.2Te crystal have been observed by X-ray powder diffraction technique with a diamond anvil cell (DAC) at pressures up to 25.2 GPa. At ambient pressure, Pb0.8Sn0.2Te crystal has fcc structure. Based on our experimental results, we observed that there exist two phase trans...

Hydrodynamics Calculations of the Fast Shock Tube Drived by High Explosive

LIU Er-Yan, YUAN Xian-Chun, LIAO Zhen-Min

1996, 10(3): 231-235 . doi: 10.11858/gywlxb.1996.03.011

PDF (638)

Abstract:
A phased implosion in a cylindrically high explosive (HE) shell can form extremely high pressures and energy densities in a low-density foam core within shell. In a properly designed system, the flow of compressed foam approaches a steady state nozzle flow with the same velocity as that of detonatio...

Study on Diamond Film Deposition Growth on Stainless Steel Using Gas Source of CH3OH/H2

ZHANG Xiao-Ping

1996, 10(3): 236-240 . doi: 10.11858/gywlxb.1996.03.012

PDF (779)

Abstract:
By means of microwave chemical vapor deposition (MWCVD) method, CH3OH/H2 gas mixtures are used as a gas source, along with a 30 nm amorphous thick silicon as a transition layer, a diamond film can successfully be grown on a stainless steel substrate, with a lowest growth temperature of 420 ℃. Tests ...

1996 Vol. 10, No. 3

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