Materials Data on Sm3HfSb5 by Materials Project
Sm3HfSb5 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. Sm3+ is bonded in a 9-coordinate geometry to nine Sb+2.60- atoms. There are a spread of Sm–Sb bond distances ranging from 3.20–3.36 Å. Hf4+ is bonded to six equivalent Sb+2.60- atoms to form face-sharing HfSb6 octahedra. All Hf–Sb bond lengths are 2.95 Å. There are two inequivalent Sb+2.60- sites. In the first Sb+2.60- site, Sb+2.60- is bonded to five equivalent Sm3+ and two equivalent Hf4+ atoms to form a mixture of distorted face, edge, and corner-sharing SbSm5Hf2 pentagonal bipyramids. In the second Sb+2.60- site, Sb+2.60- is bonded in a 8-coordinate geometry to six equivalent Sm3+ and two equivalent Sb+2.60- atoms. Both Sb–Sb bond lengths are 3.17 Å.