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Journal Articles

Site occupancy of interstitial deuterium atoms in face-centred cubic iron

Machida, Akihiko; Saito, Hiroyuki; Sugimoto, Hidehiko*; Hattori, Takanori; Sano, Asami; Endo, Naruki*; Katayama, Yoshinori; Iizuka, Riko*; Sato, Toyoto*; Matsuo, Motoaki*; et al.

Nature Communications (Internet), 5, p.5063_1 - 5063_6, 2014/09

 Times Cited Count:32 Percentile:81.93(Multidisciplinary Sciences)

Iron hydride FeH$$_x$$, is thermodynamically stable only at high hydrogen pressure of several GPa. To investigate the hydrogenation process and hydrogen state in iron hydride, it is necessary to carry out the in-situ measurement under high pressure and high temperature. In this study, we performed the in-situ neutron diffraction measurement of Fe-D system using the high pressure neutron diffractometer PLANET in the MLF, J-PARC, and determined the deuterium occupying sites and occupancies in fcc-FeD$$_x$$. We found the minor occupation of tetrahedral sites under high pressure and high temperature. We considered the mechanism of the minor occupation based on the Quantum-mechanical calculation.

Journal Articles

Li$$_{4}$$FeH$$_{6}$$; Iron-containing complex hydride with high gravimetric hydrogen density

Saito, Hiroyuki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Iijima, Yuki*; Endo, Naruki*; Aoki, Katsutoshi*; Orimo, Shinichi*

APL Materials (Internet), 2(7), p.076103_1 - 076103_7, 2014/07

 Times Cited Count:19 Percentile:68.65(Nanoscience & Nanotechnology)

Journal Articles

Unusual sevenfold coordination of Ru in complex hydride Na$$_{3}$$RuH$$_{7}$$; Prospect for formation of [FeH$$_{7}$$]$$^{3-}$$ anion

Takagi, Shigeyuki*; Ikeshoji, Tamio*; Matsuo, Motoaki*; Sato, Toyoto*; Saito, Hiroyuki; Aoki, Katsutoshi; Orimo, Shinichi*

Applied Physics Letters, 103(11), p.113903_1 - 113903_4, 2013/09

 Times Cited Count:9 Percentile:42.85(Physics, Applied)

Journal Articles

Formation process of perovskite-type hydride LiNiH$$_{3}$$; ${it In situ}$ synchrotron radiation X-ray diffraction study

Sato, Ryutaro*; Saito, Hiroyuki; Endo, Naruki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Aoki, Katsutoshi; Orimo, Shinichi*

Applied Physics Letters, 102(9), p.091901_1 - 091901_4, 2013/03

 Times Cited Count:21 Percentile:70.37(Physics, Applied)

Journal Articles

Density-functional study of perovskite-type hydride LiNiH$$_{3}$$ and its synthesis; Mechanism for formation of metallic perovskite

Takagi, Shigeyuki*; Saito, Hiroyuki; Endo, Naruki; Sato, Ryutaro*; Ikeshoji, Tamio*; Matsuo, Motoaki*; Miwa, Kazutoshi*; Aoki, Katsutoshi; Orimo, Shinichi*

Physical Review B, 87(12), p.125134_1 - 125134_6, 2013/03

 Times Cited Count:9 Percentile:44.94(Materials Science, Multidisciplinary)

Journal Articles

Formation of an Fe-H complex anion in YFe$$_{2}$$; Adjustment of imbalanced charge by additional Li as an electron donor

Matsuo, Motoaki*; Saito, Hiroyuki; Machida, Akihiko; Sato, Ryutaro*; Takagi, Shigeyuki*; Miwa, Kazutoshi*; Watanuki, Tetsu; Katayama, Yoshinori; Aoki, Katsutoshi; Orimo, Shinichi*

RSC Advances (Internet), 3(4), p.1013 - 1016, 2013/01

 Times Cited Count:16 Percentile:53.71(Chemistry, Multidisciplinary)

Journal Articles

Experimental studies of complex hydride YMn$$_{2}$$H$$_{6}$$ on formation kinetics and X-ray absorption fine structure analyses

Matsuo, Motoaki*; Matsumura, Daiju; Nishihata, Yasuo; Li, G.*; Hiyama, Nao*; Semboshi, Satoshi*; Orimo, Shinichi*

Applied Physics Letters, 100(4), p.044101_1 - 044101_3, 2012/01

 Times Cited Count:3 Percentile:15.33(Physics, Applied)

Oral presentation

Direct observation of metal-hydrogen covalent bond in complex hydride YMn$$_{2}$$H$$_{6}$$ by using X-ray absorption fine structure

Matsumura, Daiju; Nishihata, Yasuo; Matsuo, Motoaki*; Li, G.*; Hiyama, Nao*; Semboshi, Satoshi*; Orimo, Shinichi*

no journal, , 

no abstracts in English

Oral presentation

Direct observation of metal-hydrogen bonding in complex hydride YMn$$_{2}$$H$$_{6}$$

Matsumura, Daiju; Matsuo, Motoaki*; Li, G.*; Hiyama, Nao*; Semboshi, Satoshi*; Nishihata, Yasuo; Orimo, Shinichi*

no journal, , 

no abstracts in English

Oral presentation

Study of atomic substitution effect for YMn$$_{2}$$H$$_{6}$$ by direct observation of metal-hydrogen bonding

Matsumura, Daiju; Nishihata, Yasuo; Matsuo, Motoaki*; Takagi, Shigeyuki*; Orimo, Shinichi*

no journal, , 

no abstracts in English

Oral presentation

Structural studies of iron deuteride by in-situ neutron diffraction measurements under high temperature and high pressure

Machida, Akihiko; Saito, Hiroyuki; Hattori, Takanori; Sano, Asami; Endo, Naruki; Watanuki, Tetsu; Katayama, Yoshinori; Aoki, Katsutoshi; Sato, Toyoto*; Matsuo, Motoaki*; et al.

no journal, , 

no abstracts in English

Oral presentation

In situ neutron diffraction measurement on deuterization process of iron at high pressure and high temperature

Machida, Akihiko; Saito, Hiroyuki; Hattori, Takanori; Sano, Asami; Endo, Naruki*; Watanuki, Tetsu; Katayama, Yoshinori; Iizuka, Riko*; Sato, Toyoto*; Matsuo, Motoaki*; et al.

no journal, , 

Iron hydride FeH$$_x$$, is thermodynamically stable only at high hydrogen pressure of several GPa. Three hydride phases, bcc-FeH$$_x$$ ($$x < 0.05$$), dhcp-FeH$$_x$$ ($$x sim 1$$), and fcc-FeH$$_x$$ ($$x = 0 - 1$$) were confirmed at 300-2000 K and 0-20 GPa. In situ neutron diffraction measurement on their deutrides have not been reported yet. A high pressure neutron diffractometor, PLANET, constructed at Materials and Life Science Experimental Facility at J-PARC, enables us to perform in situ neutoron diffraction measurements on deuterization process of metals at high pressure and high temperature. With PLANET, the deuteration process of iron was investigated at a pressure of about 7 GPa and temperatures up to about 1000 K. This in situ measurement was successfully made using a deuterization reaction cell developed for neutron diffraction measurement. We observed the bcc-fcc transition of pure iron around 800 K and successive deuterization of fcc-Fe around 870 K.

Oral presentation

${it In situ}$ neutron diffraction measurement on the deuterization process of Fe at high temperature and high pressure

Machida, Akihiko; Saito, Hiroyuki; Hattori, Takanori; Sano, Asami; Endo, Naruki; Watanuki, Tetsu; Katayama, Yoshinori; Iizuka, Riko*; Sato, Toyoto*; Matsuo, Motoaki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Synthesis of ion-containing complex hydride Li$$_{4}$$FeH$$_{6}$$ at high pressures and high temperatures

Saito, Hiroyuki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Iijima, Yuki*; Endo, Naruki; Aoki, Katsutoshi; Orimo, Shinichi*

no journal, , 

no abstracts in English

Oral presentation

Study of deuterization reaction process of iron at high pressure using in situ neutron diffraction measurement

Machida, Akihiko; Saito, Hiroyuki; Hattori, Takanori; Sano, Asami; Endo, Naruki; Watanuki, Tetsu; Katayama, Yoshinori; Iizuka, Riko*; Sato, Toyoto*; Matsuo, Motoaki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Synthesis of Li$$_{4}$$FeH$$_{6}$$ under high pressure and high temperature

Saito, Hiroyuki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Iijima, Yuki*; Endo, Naruki*; Aoki, Katsutoshi*; Orimo, Shinichi*

no journal, , 

no abstracts in English

Oral presentation

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

Saito, Hiroyuki; Takagi, Shigeyuki*; Iijima, Yuki*; Sato, Toyoto*; Matsuo, Motoaki*; Aoki, Katsutoshi*; Orimo, Shinichi*

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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