Materials Data on Ho3Sn7 by Materials Project
Ho3Sn7 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to twelve Sn atoms to form a mixture of corner and face-sharing HoSn12 cuboctahedra. There are four shorter (3.14 Å) and eight longer (3.40 Å) Ho–Sn bond lengths. In the second Ho site, Ho is bonded in a 10-coordinate geometry to ten Sn atoms. There are a spread of Ho–Sn bond distances ranging from 3.19–3.47 Å. There are four inequivalent Sn sites. In the first Sn site, Sn is bonded in a square co-planar geometry to four equivalent Ho and eight Sn atoms. There are four shorter (3.38 Å) and four longer (3.42 Å) Sn–Sn bond lengths. In the second Sn site, Sn is bonded in a 10-coordinate geometry to four Ho and six Sn atoms. All Sn–Sn bond lengths are 3.14 Å. In the third Sn site, Sn is bonded in a 10-coordinate geometry to four Ho and six Sn atoms. In the fourth Sn site, Sn is bonded in a 4-coordinate geometry to six equivalent Ho and two equivalent Sn atoms. Both Sn–Sn bond lengths are 3.03 Å.