Tm3Ga5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 9-coordinate geometry to one Ga(2), two equivalent Ga(1), two equivalent Ga(3), and four equivalent Ga(4) atoms. In the second Tm site, Tm(2) is bonded in a 10-coordinate geometry to two equivalent Ga(1), two equivalent Ga(2), two equivalent Ga(3), and four equivalent Ga(4) atoms. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), two equivalent Ga(2), and two equivalent Ga(4) atoms. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Tm(1), four equivalent Tm(2), one Ga(3), two equivalent Ga(1), and two equivalent Ga(4) atoms. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), one Ga(2), and two equivalent Ga(4) atoms. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), one Ga(1), one Ga(2), one Ga(3), and one Ga(4) atom.
Tm3Ga5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 9-coordinate geometry to one Ga(2), two equivalent Ga(1), two equivalent Ga(3), and four equivalent Ga(4) atoms. The Tm(1)-Ga(2) bond length is 2.80 Å. There is one shorter (2.96 Å) and one longer (3.25 Å) Tm(1)-Ga(1) bond length. There is one shorter (2.94 Å) and one longer (3.11 Å) Tm(1)-Ga(3) bond length. There are two shorter (2.89 Å) and two longer (3.12 Å) Tm(1)-Ga(4) bond lengths. In the second Tm site, Tm(2) is bonded in a 10-coordinate geometry to two equivalent Ga(1), two equivalent Ga(2), two equivalent Ga(3), and four equivalent Ga(4) atoms. There is one shorter (2.95 Å) and one longer (3.19 Å) Tm(2)-Ga(1) bond length. There is one shorter (3.02 Å) and one longer (3.06 Å) Tm(2)-Ga(2) bond length. There is one shorter (2.92 Å) and one longer (3.26 Å) Tm(2)-Ga(3) bond length. There are a spread of Tm(2)-Ga(4) bond distances ranging from 3.00-3.19 Å. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), two equivalent Ga(2), and two equivalent Ga(4) atoms. There is one shorter (2.86 Å) and one longer (3.02 Å) Ga(1)-Ga(2) bond length. Both Ga(1)-Ga(4) bond lengths are 2.62 Å. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Tm(1), four equivalent Tm(2), one Ga(3), two equivalent Ga(1), and two equivalent Ga(4) atoms. The Ga(2)-Ga(3) bond length is 2.61 Å. Both Ga(2)-Ga(4) bond lengths are 2.83 Å. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), one Ga(2), and two equivalent Ga(4) atoms. Both Ga(3)-Ga(4) bond lengths are 2.62 Å. In the fourth Ga site, Ga(4) is bonded in a 10-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), one Ga(1), one Ga(2), one Ga(3), and one Ga(4) atom. The Ga(4)-Ga(4) bond length is 2.74 Å.