JOPSS - Search Results

Journal Articles

Neutron diffraction study of hydrogen site occupancy in Fe $_{0.95}$ Si $_{0.05}$ at 14.7 GPa and 800 K

Mori, Yuichiro*; Kagi, Hiroyuki*; Kakizawa, Sho*; Komatsu, Kazuki*; Shito, Chikara*; Iizuka, Riko*; Aoki, Katsutoshi*; Hattori, Takanori; Sano, Asami; Funakoshi, Kenichi*; et al.

Journal of Mineralogical and Petrological Sciences, 116(6), p.309 - 313, 2021/00

https://doi.org/10.2465/jmps.210825

Times Cited Count：0 Percentile：0.02(Mineralogy)

The Earth's core is believed to contain some light elements because it is 10% less dense than pure Fe under the corresponding pressure and temperature conditions. Hydrogen, a promising candidate among light elements, has phase relations and physical properties that have been investigated mainly for the Fe-H system. This study specifically examined an Fe-Si-H system using in-situ neutron diffraction experiments to investigate the site occupancy of deuterium of hcp-Fez $_{0.95}$ Si $_{0.05}$ hydride at 14.7 GPa and 800 K. Results of Rietveld refinement indicate hcp-Fe $_{0.95}$ Si $_{0.05}$ hydride as having deuterium (D) occupancy of 0.24(2) exclusively at the interstitial octahedral site in the hcp lattice. The effect on the site occupancy of D by addition of 2.6 wt% Si into Fe (Fe $_{0.95}$ Si $_{0.05}$ ) was negligible compared to results obtained from an earlier study of an Fe-D system (Machida et al., 2019).

Journal Articles

Intelligible seminar on fusion reactors, 8; Fuel cycling system for tritium recovery

Fukada, Satoshi*; Hayashi, Takumi

Nihon Genshiryoku Gakkai-Shi, 47(9), p.623 - 629, 2005/09

http://ci.nii.ac.jp/naid/10016124519

no abstracts in English

Journal Articles

Band gap closing in yttrium hydride at high pressures

Omura, Ayako; Machida, Akihiko; Watanuki, Tetsu; Aoki, Katsutoshi; Nakano, Satoshi*; Takemura, Kenichi*

Proceedings of Joint 20th AIRAPT - 43rd EHPRG International Conference on High Pressure Science and Technology (CD-ROM), 3 Pages, 2005/06

Yttrium hydride shows a structural change from a cubic dihydride to a hexagonal trihydride by hydrogenation. This is accompanied by the metal-insulator transition. The theoretical calculation of yttrium hydride speculates that the hybridization between 4d-Y and 1s-H leads to the opening of a large energy gap. They also predict that a transition from insulator to metal occurs when the volume is reduced to about 85% of the equilibrium volume in yttrium trihydride. Recently, we performed an infrared spectroscopy of yttrium trihydride to investigate pressure-induced metallization under high pressure. The insulator-metal transition occurred with an abrupt disappearance of the optical gap of 1 eV at 23 GPa. There is a possibility of the electronic transition because no structural changes occur above 20 GPa. The electronic transition can be attributed to the delocalization of the 1s electrons bound to the H+ core ions or the rearrangement of hydrogen atoms.

Journal Articles

Fusion reactor design towards radwaste minimum with advanced shield material

Tobita, Kenji; Konishi, Satoshi; Nishio, Satoshi; Kosako, Kazuaki*; Tabara, Takashi*

Purazuma, Kaku Yugo Gakkai-Shi, 77(10), p.1035 - 1039, 2001/10

http://ci.nii.ac.jp/naid/110003825686

no abstracts in English

Journal Articles

Intermetallic compounds for hydrogen storage and heat pump systems

Ishiyama, Shintaro; Eto, Motokuni

Material Chemistry 96: Proc. of Int. Symp. on Material Chemistry in Nuclear Environment, 0, p.595 - 607, 1996/00

no abstracts in English

Journal Articles

Hexagonal ZrNiAl alloy and its hydride (deuteride) with the Fe $_{2}$ P-type structure

*; *; Shimojo, Yutaka; Morii, Yukio; *

Journal of Alloys and Compounds, 231(1-2), p.755 - 759, 1995/00

https://doi.org/10.1016/0925-8388(95)01713-5

Times Cited Count：14 Percentile：67.58(Chemistry, Physical)

no abstracts in English

Journal Articles

Reversible disproportionation of ZrCo under high temperature and hydrogen pressure

Konishi, Satoshi; Nagasaki, Takanori; Okuno, Kenji

Journal of Nuclear Materials, 223, p.294 - 299, 1995/00

https://doi.org/10.1016/0022-3115(95)00007-0

Times Cited Count：101 Percentile：99.07(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Equilibrium hydrogen pressure on the solid solutions of ZrCo-HfCo intermetallic compounds

Konishi, Satoshi; Nagasaki, Takanori; Hayashi, Takumi; Okuno, Kenji

Journal of Nuclear Materials, 223, p.300 - 304, 1995/00

https://doi.org/10.1016/0022-3115(95)00006-2

Times Cited Count：22 Percentile：87.04(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Improvements in ZrCo based tritium storage media

Konishi, Satoshi; Nagasaki, Takanori; Hayashi, Takumi; Okuno, Kenji

Fusion Technology, 26(3), p.668 - 672, 1994/11

no abstracts in English

Journal Articles

A Zirconium-cobalt compound as the material for a reversible tritium getter

; Konishi, Satoshi; Katsuta, Hiroji; Naruse, Yuji

Fusion Technology, 9, p.506 - 509, 1986/00

no abstracts in English

Oral presentation

Hydrogenation of AlNi $_{3}$ alloy under high pressure

Meeting title

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Keyword

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Publication Year

Held year of conference

Neutron diffraction study of hydrogen site occupancy in Fe $_{0.95}$ Si $_{0.05}$ at 14.7 GPa and 800 K

Intelligible seminar on fusion reactors, 8; Fuel cycling system for tritium recovery

Band gap closing in yttrium hydride at high pressures

Fusion reactor design towards radwaste minimum with advanced shield material

Intermetallic compounds for hydrogen storage and heat pump systems

Hexagonal ZrNiAl alloy and its hydride (deuteride) with the Fe $_{2}$ P-type structure

Reversible disproportionation of ZrCo under high temperature and hydrogen pressure

Equilibrium hydrogen pressure on the solid solutions of ZrCo-HfCo intermetallic compounds

Improvements in ZrCo based tritium storage media

A Zirconium-cobalt compound as the material for a reversible tritium getter

Hydrogenation of AlNi $_{3}$ alloy under high pressure

Synthetic studies of novel metal hydrides

Hydrogenation of AlFe, AlCo, and AlNi alloys with CsCl-type structure under high pressure and high temperature

Developments of novel hydrogen storage materials using high-pressure and high-temperature technique

Synthesis of novel aluminum-based hydrogen storage material

High-pressure and high-temperature synthetic study on hydrides with high hydrogen content

Synthesis of novel metal hydrides using high-pressure and high-temperature technique, 2

Synthetic study of novel hydrides under high pressure and high temperature, 2

Syntheses of complex hydrides under high pressure and high temperature using synchrotron X-ray diffraction measurement

High-pressure and high-temperature syntheses of novel hydrides