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

1994 Vol. 8, No. 3

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Crystallization Process of Amorphous SrB4O7：Eu2+ under High Pressure and High Temperature
LIU Hong-Jian, LIU Wei-Na, GUAN Zhong-Su, SUN Shu-Lan, SU Wen-Hui
1994, 8(3): 161-165 . doi: 10.11858/gywlxb.1994.03.001
PDF (589)
Abstract:
The crystallization process of amorphous SrB4O7 under high pressure were studied by using X-ray diffraction and Eu2+ emission spectra. X-ray diffraction results show that under the pressure of 5.0 GPa, at 200 ℃ there exists a few small diffraction peaks with very low intensity, indicating trace crys...
Fractal Descriptions of Some Fracture Problems
LEI Wei-Sheng, CHEN Bing-Sen
1994, 8(3): 166-171 . doi: 10.11858/gywlxb.1994.03.002
PDF (705)
Abstract:
This paper presents fractal descriptions of critical crack extension force, crack branching and crack propagation speed. Besides the measurements of fractal dimension of fractured surfaces is discussed.
Parameter Selection of Indirectly Charging Magnetic Flux Compression Generator
XIE Wei-Ping, GONG Xing-Gen, SUN Qi-Zhi, SUN Cheng-Wei
1994, 8(3): 172-176 . doi: 10.11858/gywlxb.1994.03.003
PDF (616)
Abstract:
In this paper, an indirectly charging magnetic flux compression generator (MFCG) is theoretically investigated from circuit equation. It shows that the inductance L1 and capacitance C0 of charging circuit must satisfy the relation (L1C0)1/2T when an indirectly charging MFCG is designed; coupling MFC...
Investigations of Different Type of Glass by Ultrasonic Interferometer Technique at Room Temperature and High Pressure
WANG Ru-Ju, LI Feng-Ying, XU Ji-An, Manghnani M H, XIE Hong-Sen
1994, 8(3): 177-183 . doi: 10.11858/gywlxb.1994.03.004
PDF (682)
Abstract:
The ultrasonic interferometer techniques－phase comparison method, pulse echo overlap, pulse superposition and phase detection have been combined together to study the elastic properties of three types of glass under different pressures and room temperature. These glasses are named by silicate glass ...
The XPS Study of CeTbO3+ Synthesized by High Pressure and Temperature
LI Li-Ping, WEI Quan, LIU Hong-Jian, ZHENG Da-Fang, SU Wen-Hui
1994, 8(3): 184-189 . doi: 10.11858/gywlxb.1994.03.005
PDF (745)
Abstract:
The samples of CeTbO3+ synthesized by high pressure and high temperature were studied by XPS. It is found that Tb4+ ion begins to transform to Tb3+ at about 600 ℃ and Ce4+ to Ce3+ about 800 ℃. The single phase compound of CeTbO3+ having a fluorite structure is formed at 1000 ℃, in which the Ce ions ...
The Thermal Shock Wave Induced by X-Ray and Electron Beam Radiation and the Compressive Stress Wave
Zhou Nan
1994, 8(3): 190-199 . doi: 10.11858/gywlxb.1994.03.006
PDF (610)
Abstract:
The paper describes the characteristic difference between the thermal shock wave induced by X-ray and electron beam radiation and the compression wave due to explosion and high-velocity impact, results of which are useful for the investigation and simulation of the thermal shock waves.
MoSi2 Band Gap Modulation at High Pressure
ZHANG Hai-Feng, LI Yong-Ping, HUANG Xin-Tang
1994, 8(3): 200-204 . doi: 10.11858/gywlxb.1994.03.007
PDF (743)
Abstract:
The electronic structure of transition metal disilicides MoSi2 at high pressure was studied by using LMTO-ASA method. All the relativistic effects except spin-orbit coupling were considered. The results indicate that, with the compressibility increasing, the width of valence band became wider which ...
Simulation Study on Laser-Induced Spallation in Aluminum
ZHANG Wan-Jia, WANG Wu, ZENG Yuan-Jin, SONG Chun-Xiang
1994, 8(3): 205-212 . doi: 10.11858/gywlxb.1994.03.008
PDF (707)
Abstract:
The occurrence of spall in target caused by laser-driven shock wave depends on the power density of the beam, the induced pressure pulse duration, the target thickness and the target material parameters. The propagation attenuation of a triangular compressive wave and the time-dependence of spallati...
Dynamic Properties of LF-6 and LY-12 Aluminum Alloy under High Temperature－High Temperature Shearing Modulus Measurement
WANG Chun-Kui
1994, 8(3): 213-219 . doi: 10.11858/gywlxb.1994.03.009
PDF (782)
Abstract:
Investigations of high temperature shearing medulus with the torsional Hopkinson bar method, of LF-6 and LY-12 aluminum alloy at temperatures up to 440 ℃, is introduced, elastic modulus and Poisson ratio of LF-6 aluminum alloy are reported. Results show that these dynamic properties, especially at h...
The Preparation of Diamond Film with the Method of Electron Assisted Chemical Vapor Deposition
GU Chang-Zhi, WANG Chun-Lei, JIN Zeng-Sun, Lü Xian-Yi, ZOU Guang-Tian
1994, 8(3): 220-223 . doi: 10.11858/gywlxb.1994.03.010
PDF (835)
Abstract:
A high quality diamond film which has a high growth velocity has been synthesized on Si substrates by means of the electron assisted chemical vapor deposition method. The maximum growth velocity is 7 m/h and the growth areas of diamond film is 40 mm. The growth characteristics of the high quality di...
Studies on Regenerated Catalyst of Electrodeposition and Diamond Synthesis
YANG Chang-Yuan, GUO Bi-Hong, DING Li-Ye, GOU Qing-Quan
1994, 8(3): 224-228 . doi: 10.11858/gywlxb.1994.03.011
PDF (642)
Abstract:
Catalyst plays an important role in the diamond synthesis by static pressure method. It can lower the pressure and temperature required to transform graphite into diamond. The smelted Ni-Mn-Co catalyst is widely used in China. In this paper, a new kind of catalyst is made according to Gou Qingquan's...
The Nucleation Mechanism of Substrates Surface Defects in Low Pressure Vapor Deposition of Diamond Thin Films
YANG Guo-Wei
1994, 8(3): 229-236 . doi: 10.11858/gywlxb.1994.03.012
PDF (810)
Abstract:
To promote diamond nucleation density, introduction of defects on the substrate surface is an effective method in low pressure vapor deposition of diamond thin film growth. However, little studies in this field have been made so far. Based on our experiments, we present in the paper the diamond nucl...
High Pressure Study on Wollastonite
YANG Jing-Hai, YAO Bin, LIU Hong-Jian, GENG Yi-Zhi, SU Wen-Hui, ZHANG Ju-Yuan
1994, 8(3): 237-240 . doi: 10.11858/gywlxb.1994.03.013
PDF (1045)
Abstract:
The wollastonite (CaSiO3 ) synthesized by high temperature (HT) under atmospheric pressure (AP) has a triclinic structure while the natural wollastonite with high purity originating from Dading Mountain, Lishu, Jilin Province, China, has a white chain-like structure of monoclinic type. Pressure-indu...

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