Pressure-induced structural phase transition in rare-earth trihydrides. Part Ⅱ. SmH_3 and compressibility systematics

摘要

High-pressure studies of samarium trihydride have been performed in a diamond anvil cell at pressures up to 30 GPa at room temperature. As a result, a reversible structural phase transformation from the hexagonal to the cubic phase has been observed. The transition pressure and the lattice parameter follow the tendency of the other lanthanide trihydrides investigated earlier [T. Palasyuk, M. Tkacz, Solid State Commun. 130 (2004) 219; T. Palasyuk, M. Tkacz, Solid State Commun. 133 (2005) 477; T. Palasyuk, M. Tkacz, Solid State Commun. 133 (2005) 481]. The compressibility systematics of lanthanide and yttrium trihydrides has been established.