DOE OSTI2020
Tm6Co2Sn crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are three inequivalent Tm sites. In the first Tm site, Tm is bonded in a distorted rectangular see-saw-like geometry to two Co and two Sn atoms. There are one shorter (2.67 Å) and one longer (3.10 Å) Tm–Co bond lengths. There are one shorter (3.06 Å) and one longer (3.29 Å) Tm–Sn bond lengths. In the second Tm site, Tm is bonded in a 5-coordinate geometry to three Co and two Sn atoms. There are two shorter (2.90 Å) and one longer (3.09 Å) Tm–Co bond lengths. There are one shorter (3.17 Å) and one longer (3.59 Å) Tm–Sn bond lengths. In the third Tm site, Tm is bonded in a 4-coordinate geometry to three Co and one Sn atom. There are one shorter (2.70 Å) and two longer (2.85 Å) Tm–Co bond lengths. The Tm–Sn bond length is 3.35 Å. There are two inequivalent Co sites. In the first Co site, Co is bonded in a 2-coordinate geometry to eight Tm atoms. In the second Co site, Co is bonded in a 9-coordinate geometry to eight Tm and one Co atom. The Co–Co bond length is 2.25 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a cuboctahedral geometry to twelve Tm atoms. In the second Sn site, Sn is bonded in a distorted body-centered cubic geometry to eight Tm atoms.