Er6Ni2Sn crystallizes in the orthorhombic Immm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 4-coordinate geometry to one Ni(1), two equivalent Ni(2), and one Sn(1) atom. In the second Er site, Er(2) is bonded in a 4-coordinate geometry to one Ni(1), one Ni(2), one Sn(1), and one Sn(2) atom. In the third Er site, Er(3) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(1), 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 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), four equivalent Er(3), and one Ni(1) atom. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(3), and four equivalent Er(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a cuboctahedral geometry to four equivalent Er(1), four equivalent Er(2), and four equivalent Er(3) atoms. In the second Sn site, Sn(2) is bonded in a body-centered cubic geometry to four equivalent Er(2) and four equivalent Er(3) atoms.
Er6Ni2Sn crystallizes in the orthorhombic Immm space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 4-coordinate geometry to one Ni(1), two equivalent Ni(2), and one Sn(1) atom. The Er(1)-Ni(1) bond length is 2.69 Å. Both Er(1)-Ni(2) bond lengths are 2.87 Å. The Er(1)-Sn(1) bond length is 3.35 Å. In the second Er site, Er(2) is bonded in a 4-coordinate geometry to one Ni(1), one Ni(2), one Sn(1), and one Sn(2) atom. The Er(2)-Ni(1) bond length is 3.18 Å. The Er(2)-Ni(2) bond length is 2.73 Å. The Er(2)-Sn(1) bond length is 3.33 Å. The Er(2)-Sn(2) bond length is 3.06 Å. In the third Er site, Er(3) is bonded in a 5-coordinate geometry to one Ni(2), two equivalent Ni(1), one Sn(1), and one Sn(2) atom. The Er(3)-Ni(2) bond length is 3.13 Å. Both Er(3)-Ni(1) bond lengths are 2.88 Å. The Er(3)-Sn(1) bond length is 3.60 Å. The Er(3)-Sn(2) bond length is 3.21 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), two equivalent Er(2), four equivalent Er(3), and one Ni(1) atom. The Ni(1)-Ni(1) bond length is 2.49 Å. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(3), and four equivalent Er(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a cuboctahedral geometry to four equivalent Er(1), four equivalent Er(2), and four equivalent Er(3) atoms. In the second Sn site, Sn(2) is bonded in a body-centered cubic geometry to four equivalent Er(2) and four equivalent Er(3) atoms.