Tm12Co5Bi crystallizes in the orthorhombic Immm space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 5-coordinate geometry to one Co(1), one Co(3), two equivalent Co(2), and one Bi(1) atom. In the second Tm site, Tm(2) is bonded in a 4-coordinate geometry to one Co(2), two equivalent Co(1), and one Bi(1) atom. In the third Tm site, Tm(3) is bonded in a 2-coordinate geometry to one Co(1), one Co(2), one Co(3), and one Bi(1) atom. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to two equivalent Tm(1), two equivalent Tm(3), four equivalent Tm(2), and one Co(1) atom. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to two equivalent Tm(2), two equivalent Tm(3), four equivalent Tm(1), and one Co(2) atom. In the third Co site, Co(3) is bonded in a distorted body-centered cubic geometry to four equivalent Tm(1) and four equivalent Tm(3) atoms. Bi(1) is bonded in a cuboctahedral geometry to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Tm(3) atoms.
Tm12Co5Bi crystallizes in the orthorhombic Immm space group. There are three inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 5-coordinate geometry to one Co(1), one Co(3), two equivalent Co(2), and one Bi(1) atom. The Tm(1)-Co(1) bond length is 3.21 Å. The Tm(1)-Co(3) bond length is 3.13 Å. Both Tm(1)-Co(2) bond lengths are 2.82 Å. The Tm(1)-Bi(1) bond length is 3.57 Å. In the second Tm site, Tm(2) is bonded in a 4-coordinate geometry to one Co(2), two equivalent Co(1), and one Bi(1) atom. The Tm(2)-Co(2) bond length is 2.63 Å. Both Tm(2)-Co(1) bond lengths are 2.80 Å. The Tm(2)-Bi(1) bond length is 3.39 Å. In the third Tm site, Tm(3) is bonded in a 2-coordinate geometry to one Co(1), one Co(2), one Co(3), and one Bi(1) atom. The Tm(3)-Co(1) bond length is 2.65 Å. The Tm(3)-Co(2) bond length is 3.30 Å. The Tm(3)-Co(3) bond length is 2.76 Å. The Tm(3)-Bi(1) bond length is 3.37 Å. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded in a 9-coordinate geometry to two equivalent Tm(1), two equivalent Tm(3), four equivalent Tm(2), and one Co(1) atom. The Co(1)-Co(1) bond length is 2.24 Å. In the second Co site, Co(2) is bonded in a 9-coordinate geometry to two equivalent Tm(2), two equivalent Tm(3), four equivalent Tm(1), and one Co(2) atom. The Co(2)-Co(2) bond length is 2.15 Å. In the third Co site, Co(3) is bonded in a distorted body-centered cubic geometry to four equivalent Tm(1) and four equivalent Tm(3) atoms. Bi(1) is bonded in a cuboctahedral geometry to four equivalent Tm(1), four equivalent Tm(2), and four equivalent Tm(3) atoms.