Materials Data on Sm2Si3Pt by Materials Project
Sm2PtSi3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. there are two inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded to two equivalent Pt2- and ten Si+1.33- atoms to form a mixture of edge and face-sharing SmSi10Pt2 cuboctahedra. Both Sm–Pt bond lengths are 3.17 Å. There are a spread of Sm–Si bond distances ranging from 3.11–3.18 Å. In the second Sm3+ site, Sm3+ is bonded to four equivalent Pt2- and eight Si+1.33- atoms to form a mixture of edge and face-sharing SmSi8Pt4 cuboctahedra. All Sm–Pt bond lengths are 3.18 Å. There are four shorter (3.11 Å) and four longer (3.17 Å) Sm–Si bond lengths. Pt2- is bonded in a distorted trigonal planar geometry to six Sm3+ and three Si+1.33- atoms. There are one shorter (2.37 Å) and two longer (2.40 Å) Pt–Si bond lengths. There are three inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 9-coordinate geometry to six Sm3+ and three Si+1.33- atoms. There are one shorter (2.36 Å) and two longer (2.40 Å) Si–Si bond lengths. In the second Si+1.33- site, Si+1.33- is bonded in a 2-coordinate geometry to six Sm3+, two equivalent Pt2-, and one Si+1.33- atom. In the third Si+1.33- site, Si+1.33- is bonded in a distorted single-bond geometry to six Sm3+, one Pt2-, and two equivalent Si+1.33- atoms.