Tm6Ni2Sn crystallizes in the orthorhombic Immm space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a distorted rectangular see-saw-like geometry to one Ni(1), one Ni(2), one Sn(1), and one Sn(2) atom. In the second Tm site, Tm(2) is bonded in a 4-coordinate geometry to one Ni(2), two equivalent Ni(1), and one Sn(2) atom. In the third Tm site, Tm(3) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Ni(2), one Sn(1), and one Sn(2) atom. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(3), and four equivalent Tm(2) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), four equivalent Tm(3), and one Ni(2) atom. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a body-centered cubic geometry to four equivalent Tm(1) and four equivalent Tm(3) atoms. In the second Sn site, Sn(2) is bonded in a cuboctahedral geometry to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Tm(3) atoms.
Tm6Ni2Sn crystallizes in the orthorhombic Immm space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a distorted rectangular see-saw-like geometry to one Ni(1), one Ni(2), one Sn(1), and one Sn(2) atom. The Tm(1)-Ni(1) bond length is 2.72 Å. The Tm(1)-Ni(2) bond length is 3.11 Å. The Tm(1)-Sn(1) bond length is 3.04 Å. The Tm(1)-Sn(2) bond length is 3.31 Å. In the second Tm site, Tm(2) is bonded in a 4-coordinate geometry to one Ni(2), two equivalent Ni(1), and one Sn(2) atom. The Tm(2)-Ni(2) bond length is 2.67 Å. Both Tm(2)-Ni(1) bond lengths are 2.85 Å. The Tm(2)-Sn(2) bond length is 3.33 Å. In the third Tm site, Tm(3) is bonded in a 5-coordinate geometry to one Ni(1), two equivalent Ni(2), one Sn(1), and one Sn(2) atom. The Tm(3)-Ni(1) bond length is 3.18 Å. Both Tm(3)-Ni(2) bond lengths are 2.85 Å. The Tm(3)-Sn(1) bond length is 3.23 Å. The Tm(3)-Sn(2) bond length is 3.56 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 8-coordinate geometry to two equivalent Tm(1), two equivalent Tm(3), and four equivalent Tm(2) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), four equivalent Tm(3), and one Ni(2) atom. The Ni(2)-Ni(2) bond length is 2.57 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a body-centered cubic geometry to four equivalent Tm(1) and four equivalent Tm(3) atoms. In the second Sn site, Sn(2) is bonded in a cuboctahedral geometry to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Tm(3) atoms.