Materials Data on Sm2Si3Pd by Materials Project

Abstract

Sm2PdSi3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded to two equivalent Pd and ten Si atoms to form a mixture of face and edge-sharing SmSi10Pd2 cuboctahedra. Both Sm–Pd bond lengths are 3.17 Å. There are a spread of Sm–Si bond distances ranging from 3.09–3.19 Å. In the second Sm site, Sm is bonded to four equivalent Pd and eight Si atoms to form a mixture of face and edge-sharing SmSi8Pd4 cuboctahedra. All Sm–Pd bond lengths are 3.19 Å. There are a spread of Sm–Si bond distances ranging from 3.10–3.18 Å. Pd is bonded in a 3-coordinate geometry to six Sm and three Si atoms. There are one shorter (2.38 Å) and two longer (2.41 Å) Pd–Si bond lengths. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to six Sm and three Si atoms. There are one shorter (2.36 Å) and two longer (2.39 Å) Si–Si bond lengths. In the second Si site, Si is bonded in a 2-coordinate geometry to six Sm, two equivalent Pd, and one Si atom. In the third Si site, Si is bonded in a 1-coordinate geometry to six Sm, one Pd, and two equivalent Si atoms.