Interaction of RT3 (R=Ce, T=Co, Ni, Fe) intermetallic compounds with hydrogen under high pressure

Directional metal–hydrogen bonding in interstitial hydrides

“…for all phases, including the solid solution ␣-phase for which the present data indicate x < 0.1. As for the cell parameters, those reported for ErNi 3 H 1.9 [6] correspond to the present composition ErNi 3 H 1.23 , those reported for ErNi 3 H 2.8 and ErNi 3 H 1.1 [7] correspond to ErNi 3 H 2.0 and hydrogen-free ErNi 3 , respectively, and those reported for ErNi 3 H 4.9 [8] to the lower limit of the ␥-phase ErNi 3 H 3.4 . As with the cobalt system YCo 3 D x [2], the cell expansion is very anisotropic.…”

“…In contrast to the cobalt system YCo 3 D x that displays only three interstitial D sites, the nickel system ErNi 3 D x displays up to seven. They Table 3 Structure data for non-centrosymmetric ␤ 2 -ErNi 3 D 1.97 (4) and ␥-ErNi 3 D 3.75 (8) as refined in centrosymmetric R3m from neutron powder diffraction, e.s.d's in parentheses…”