Materials Data on Sm2Sn5 by Materials Project
Sm2Sn5 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded to twelve Sn atoms to form a mixture of corner and face-sharing SmSn12 cuboctahedra. There are a spread of Sm–Sn bond distances ranging from 3.28–3.40 Å. In the second Sm site, Sm is bonded in a 10-coordinate geometry to ten Sn atoms. There are a spread of Sm–Sn bond distances ranging from 3.25–3.56 Å. There are six inequivalent Sn sites. In the first Sn site, Sn is bonded in a distorted rectangular see-saw-like geometry to four Sm and six Sn atoms. There are four shorter (3.28 Å) and two longer (3.31 Å) Sn–Sn bond lengths. In the second Sn site, Sn is bonded in a 8-coordinate geometry to six equivalent Sm and two equivalent Sn atoms. Both Sn–Sn bond lengths are 3.09 Å. In the third Sn site, Sn is bonded in a distorted square co-planar geometry to four equivalent Sm atoms. In the fourth Sn site, Sn is bonded in a distorted rectangular see-saw-like geometry to four equivalent Sm and four Sn atoms. Both Sn–Sn bond lengths are 3.32 Å. In the fifth Sn site, Sn is bonded in a 4-coordinate geometry to four Sm and six Sn atoms. In the sixth Sn site, Sn is bonded in a distorted square co-planar geometry to four equivalent Sm atoms.