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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

 Times Cited Count:106 Percentile:93.4(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

 Times Cited Count:7 Percentile:39.68(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

 Times Cited Count:1 Percentile:13.53(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

no abstracts in English

Journal Articles

Effect of heating atmosphere on densification of sol-gel (Th,U)O$$_{2}$$ microspheres

; Takahashi, Yoshihisa

Journal of Nuclear Materials, 207, p.255 - 265, 1993/00

 Times Cited Count:4 Percentile:45.58(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

In-pile densification of UO$$_{2}$$ pellet irradiated up to 1720 MWd/tU

; *

Journal of Nuclear Materials, 127, p.116 - 118, 1985/00

 Times Cited Count:2 Percentile:64.45(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Densification of Uranium Dioxide Fuel Pellets, III

JAERI-M 7807, 66 Pages, 1978/08

JAERI-M-7807.pdf:3.1MB

no abstracts in English

JAEA Reports

Study on Densification of Uranium Dioxide Fuel Pellet

; ; *

JAERI-M 7210, 51 Pages, 1977/08

JAERI-M-7210.pdf:5.3MB

no abstracts in English

JAEA Reports

Densification of uranium dioxide fuel pellets, (1)

; ; Ichikawa, Michio

JAERI-M 6904, 23 Pages, 1977/02

JAERI-M-6904.pdf:1.02MB

no abstracts in English

JAEA Reports

Efect of Fuel Peller Densifieation on Fuel Rod Internal Pressure

; ; ; *

JAERI-M 6631, 18 Pages, 1976/07

JAERI-M-6631.pdf:0.62MB

no abstracts in English

JAEA Reports

FREG-1; A Computer Program for Calculating the Gap Conductance in Oxide Fuel Pins

; ; ; ; ; ; *

JAERI-M 5958, 51 Pages, 1975/01

JAERI-M-5958.pdf:1.45MB

no abstracts in English

13 (Records 1-13 displayed on this page)
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