Pressure induced disproportionation in rare-earth metal dihydrides

Machida, Akihiko; Omura, Ayako*; Watanuki, Tetsu; Aoki, Katsutoshi

We have investigated the structural properties of yttrium dihydrides, YH, by synchrotron radiation X-ray diffraction measurements under high pressure. YH exhibit the fcc metal lattice, which contains two interstitial hydrogen atoms, which are located at the tetrahedral sites, par one metal atom. These YH have no hydrogen atom at octahedral site. Then, it is expected that the high-pressure structural properties of the YH differ from the YH. The YH sample was pressurized with He pressure medium. We have found that the second phase appeared at about 36 GPa. We will discussed the observed pressure-induced phase separation in YH.

Language	:	Japanese
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Meeting title	:	日本物理学会第62回年次大会
Held date	:	2007/09
Location (city)	:	札幌
Location (country)	:	日本
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Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : BB20071932
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