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Hirata, Sakiko*; Kusaka, Ryoji; Meiji, Shogo*; Tamekuni, Seita*; Okudera, Kosuke*; Hamada, Shoken*; Sakamoto, Chihiro*; Honda, Takumi*; Matsushita, Kosuke*; Muramatsu, Satoru*; et al.
Inorganic Chemistry, 62(1), p.474 - 486, 2023/01
Times Cited Count:0 Percentile:0.01(Chemistry, Inorganic & Nuclear)Mitsui, Takaya; Masuda, Ryo*; Seto, Makoto; Hirao, Naohisa*; Matsuoka, Takehiro*; Nakamura, Yumiko*; Sakaki, Koji*; Enoki, Hirotoshi*
Journal of Alloys and Compounds, 580(Suppl.1), p.S264 - S267, 2013/12
Times Cited Count:8 Percentile:42.44(Chemistry, Physical)Matsuoka, Takehiro*; Hirao, Naohisa*; Oishi, Yasuo*; Shimizu, Katsuya*; Machida, Akihiko; Aoki, Katsutoshi
Koatsuryoku No Kagaku To Gijutsu, 21(3), p.190 - 196, 2011/09
We present the newly developed electrical resistance measurement technique for metal hydrides compressed in high-pressure H and the first successful simultaneous measurements of electrical resistance and X-ray diffraction of FeH at high pressures and low temperatures. The electrical resistivity showed a sharp increase with the formation of iron-hydride FeH () at 3.5 GPa. The '-phase of FeH was found to be metallic up to 25.5 GPa. The vs. curves up to 16.5 GPa approximately follow Fermi-liquid law below 25 K. However, was found to be better fitting at 25.5 GPa. This change can be related to the previously reported ferromagnetism collapse at corresponding pressures.
Matsuoka, Takehiro*; Shimizu, Katsuya*; Fujihisa, Hiroshi*; Hirao, Naohisa*; Oishi, Yasuo*; Yoda, Yoshitaka*; Mitsui, Takaya; Masuda, Ryo; Machida, Akihiko; Aoki, Katsutoshi; et al.
no journal, ,
Europium-hydride EuH exposed to high-pressure H conditions has been studied by X-ray diffraction and Mssbauer spectroscopy measurements up to 50 GPa using synchrotron radiation. We report new structural and valence transitions, Pnma(x=2, divalent) P63/mmc(x=2, 7.2-8.7GPa) I4/m(x2, 8.7-9.7 GPa) I4/mmm(x2, 9.7 GPa, trivalent). The phase of I4/mmm having trivalent character is a small distortion from cubic fcc structure which has been commonly observed for -phase of all other trivalent rare-earth metal hydrides. Our study clearly demonstrates the first observation of -phase of EuH and suggest that the material is no longer an irregular member of the rare earth metal hydrides RH systems.
Meiji, Shogo*; Hirata, Sakiko*; Kusaka, Ryoji; Honda, Takumi*; Tamekuni, Seita*; Muramatsu, Satoru*; Saito, Kenichi*; Hirao, Takehiro*; Haino, Takeharu*; Watanabe, Masayuki; et al.
no journal, ,
Mitsui, Takaya; Masuda, Ryo; Hirao, Naohisa*; Matsuoka, Takehiro*
no journal, ,
no abstracts in English
Mitsui, Takaya; Imai, Yasuhiko*; Seto, Makoto*; Hirao, Naohisa*; Matsuoka, Takehiro*; Mibu, Ko*
no journal, ,
no abstracts in English