TmCo5Si3 crystallizes in the hexagonal P6_3/m space group. Tm(1) is bonded in a 12-coordinate geometry to three equivalent Co(1), three equivalent Co(2), three equivalent Co(5), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to three equivalent Tm(1), one Co(2), two equivalent Co(4), two equivalent Co(5), one Si(1), one Si(2), and two equivalent Si(3) atoms. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to three equivalent Tm(1), one Co(1), two equivalent Co(2), two equivalent Co(4), one Si(1), and three equivalent Si(3) atoms. In the third Co site, Co(3) is bonded in a 8-coordinate geometry to three equivalent Co(5), four equivalent Co(3), and three equivalent Si(2) atoms. In the fourth Co site, Co(4) is bonded in a 5-coordinate geometry to two equivalent Co(1), two equivalent Co(2), one Si(3), and four equivalent Si(1) atoms. In the fifth Co site, Co(5) is bonded in a 12-coordinate geometry to three equivalent Tm(1), two equivalent Co(1), three equivalent Co(3), one Si(3), and three equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to two equivalent Tm(1), one Co(1), one Co(2), four equivalent Co(4), and two equivalent Si(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), one Co(1), three equivalent Co(3), and three equivalent Co(5) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Tm(1), one Co(4), one Co(5), two equivalent Co(1), and three equivalent Co(2) atoms.
TmCo5Si3 crystallizes in the hexagonal P6_3/m space group. Tm(1) is bonded in a 12-coordinate geometry to three equivalent Co(1), three equivalent Co(2), three equivalent Co(5), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. There are two shorter (2.94 Å) and one longer (3.17 Å) Tm(1)-Co(1) bond length. There are two shorter (3.00 Å) and one longer (3.17 Å) Tm(1)-Co(2) bond length. There are two shorter (3.02 Å) and one longer (3.13 Å) Tm(1)-Co(5) bond length. Both Tm(1)-Si(1) bond lengths are 2.89 Å. Both Tm(1)-Si(2) bond lengths are 2.93 Å. Both Tm(1)-Si(3) bond lengths are 2.89 Å. There are five inequivalent Co sites. In the first Co site, Co(1) is bonded in a 12-coordinate geometry to three equivalent Tm(1), one Co(2), two equivalent Co(4), two equivalent Co(5), one Si(1), one Si(2), and two equivalent Si(3) atoms. The Co(1)-Co(2) bond length is 2.50 Å. Both Co(1)-Co(4) bond lengths are 2.73 Å. Both Co(1)-Co(5) bond lengths are 2.64 Å. The Co(1)-Si(1) bond length is 2.33 Å. The Co(1)-Si(2) bond length is 2.31 Å. Both Co(1)-Si(3) bond lengths are 2.32 Å. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to three equivalent Tm(1), one Co(1), two equivalent Co(2), two equivalent Co(4), one Si(1), and three equivalent Si(3) atoms. Both Co(2)-Co(2) bond lengths are 2.64 Å. Both Co(2)-Co(4) bond lengths are 2.71 Å. The Co(2)-Si(1) bond length is 2.30 Å. There is one shorter (2.30 Å) and two longer (2.32 Å) Co(2)-Si(3) bond lengths. In the third Co site, Co(3) is bonded in a 8-coordinate geometry to three equivalent Co(5), four equivalent Co(3), and three equivalent Si(2) atoms. There is one shorter (2.51 Å) and two longer (2.81 Å) Co(3)-Co(5) bond lengths. All Co(3)-Co(3) bond lengths are 2.53 Å. There is one shorter (2.26 Å) and two longer (2.41 Å) Co(3)-Si(2) bond lengths. In the fourth Co site, Co(4) is bonded in a 5-coordinate geometry to two equivalent Co(1), two equivalent Co(2), one Si(3), and four equivalent Si(1) atoms. The Co(4)-Si(3) bond length is 2.26 Å. There are two shorter (2.37 Å) and two longer (2.38 Å) Co(4)-Si(1) bond lengths. In the fifth Co site, Co(5) is bonded in a 12-coordinate geometry to three equivalent Tm(1), two equivalent Co(1), three equivalent Co(3), one Si(3), and three equivalent Si(2) atoms. The Co(5)-Si(3) bond length is 2.32 Å. There is one shorter (2.26 Å) and two longer (2.29 Å) Co(5)-Si(2) bond lengths. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to two equivalent Tm(1), one Co(1), one Co(2), four equivalent Co(4), and two equivalent Si(1) atoms. Both Si(1)-Si(1) bond lengths are 2.64 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), one Co(1), three equivalent Co(3), and three equivalent Co(5) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Tm(1), one Co(4), one Co(5), two equivalent Co(1), and three equivalent Co(2) atoms.