JOPSS - Search Results

Journal Articles

Transformations in the intermediate-range structure of SiO $_{2}$ glass under high pressure and temperature

Inamura, Yasuhiro*; Katayama, Yoshinori; Utsumi, Wataru; Funakoshi, Kenichi*

Physical Review Letters, 93(1), p.015501_1 - 015501_4, 2004/07

https://doi.org/10.1103/PhysRevLett.93.015501

Times Cited Count：135 Percentile：94.34(Physics, Multidisciplinary)

The temperature dependence of the X-ray structure factor for SiO $_{2}$ glass was measured at several pressures up to 19.2 GPa. The position of the first sharp diffraction peak moved to a higher momentum transfer as the temperature increased in a specific pressure-temperature range. The intermediate range structure was thermally relaxed to a denser one. Around 7 GPa, the temperature-induced shift saturated and the crystallization temperature drastically increased. These results support the existence of a relatively stable high-pressure form of SiO $_{2}$ glass. A sudden transformation was not observed.

Journal Articles

In situ EXAFS study on GeS $_{2}$ glass under high-pressure

Miyauchi, Koichi*; Qiu, J.*; Shojiya, Masanori*; Kawamoto, Yoji*; Kitamura, Naoyuki*; Fukumi, Kohei*; Katayama, Yoshinori; Nishihata, Yasuo

Solid State Communications, 124(5-6), p.189 - 193, 2002/10

https://doi.org/10.1016/S0038-1098(02)00489-1

Times Cited Count：7 Percentile：37.77(Physics, Condensed Matter)

A GeS $_{2}$ glass was compressed up to 8 GPa at room temperature, heated up to 270 $^{circ}$ C under 8 GPa and then decompressed to ambient pressure at room temperature, using a large volume high-pressure apparatus. The local structural-changes around Ge were examined by means of EXAFS method. The Ge-S bond length became monotonously short with increasing applied-pressure up to 8 GPa at room temperature. When the specimen was heated to 270 $^{circ}$ C under 8 GPa, however, the vond length became slightly long. The elongated bond lengthe was almost kept even after the temperature was descended to room tempertature. In decompression process, the bond length became gradually long with releasing applied-pressure down to 2 GPa, following a change in compression process. Below 2 GPa, however, the Ge-S bond length was largely elongated, being lnger than the initial one. No significant change of coordination number was found in the compression and decompression processes up to 8 GPa. This change canbe explained by a combined effect of elastic and inelastic structural-changes.

Journal Articles

Density, porosity and grain size, 1; Unirradiated ROX fules

Yanagisawa, Kazuaki; Yamashita, Toshiyuki; Kanazawa, Hiroyuki; Amano, Hidetoshi; Muromura, Tadasumi

Journal of Nuclear Science and Technology, 36(11), p.1052 - 1063, 1999/11

https://doi.org/10.3327/jnst.36.1052

Times Cited Count：1 Percentile：13.15(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

A Study on density, porosity and grain size of unirradiated ROX fules and simulated ROX fuels

Yanagisawa, Kazuaki; Omichi, Toshihiko*; Shirasu, Noriko; Yamashita, Toshiyuki; ; Onozawa, Atsushi; ; Kanazawa, Hiroyuki; Kanaitsuka, Fumio; Amano, Hidetoshi

JAERI-Tech 99-044, 46 Pages, 1999/05

JAERI-Tech-99-044.pdf:4.66MB