Materials Data on Sm2Ga2(Fe5C)3 by Materials Project

Abstract

Sm2Ga2(Fe5C)3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Sm is bonded in a distorted trigonal planar geometry to three equivalent Fe, one Ga, and three equivalent C atoms. All Sm–Fe bond lengths are 3.41 Å. The Sm–Ga bond length is 3.10 Å. All Sm–C bond lengths are 2.53 Å. There are three inequivalent Fe sites. In the first Fe site, Fe is bonded to two equivalent Sm, eight Fe, and two equivalent Ga atoms to form distorted FeSm2Ga2Fe8 cuboctahedra that share corners with four equivalent FeSm2Ga2Fe8 cuboctahedra, corners with two equivalent CSm2Fe4 octahedra, faces with four equivalent FeSm2Ga2Fe8 cuboctahedra, and faces with four equivalent CSm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 47°. There are four shorter (2.47 Å) and four longer (2.51 Å) Fe–Fe bond lengths. Both Fe–Ga bond lengths are 2.65 Å. In the second Fe site, Fe is bonded in a single-bond geometry to two equivalent Fe, two equivalent Ga, and one C atom. Both Fe–Ga bond lengths are 2.81 Å. The Fe–C bond length is 1.88 Å. In the third Fe site, Fe is bonded in a single-bond geometry to two equivalent Fe, one Ga, and one C atom. The Fe–Ga bond length is 2.66 Å. The Fe–C bond length is 1.93 Å. Ga is bonded in a 8-coordinate geometry to one Sm, twelve Fe, and one Ga atom. The Ga–Ga bond length is 2.58 Å. C is bonded to two equivalent Sm and four Fe atoms to form CSm2Fe4 octahedra that share corners with two equivalent FeSm2Ga2Fe8 cuboctahedra, corners with four equivalent CSm2Fe4 octahedra, and faces with four equivalent FeSm2Ga2Fe8 cuboctahedra. The corner-sharing octahedral tilt angles are 61°.