Pressure-induced structural transition and long-period structures of rare-earth metal hydrides

Machida, Akihiko; Watanuki, Tetsu; Aoki, Katsutoshi

Pressure-induced structural transition of rare-earth metal hydride, YH, has been investigated by synchrotron radiation X-ray diffraction experiments. We observed the pressure-induced structural transformation from the hexagonal metal lattice into an fcc one through an intermediate state, which appears in the wide pressure span of 1222 Gather obtained X-ray diffraction patterns in the intermediate state are represented by long-period structures, e.g. 27, of the yttrium metal lattice. These long-period structures are interpreted in terms of the periodic arrangements of hexagonal-type and fcc-type stacking layers of the yttrium metals. Such structural transition is considered to be characteristic for rare-earth metal hydride.