Sc5Ga3 crystallizes in the monoclinic C2/m space group. There are four inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 6-coordinate geometry to two equivalent Ga(1) and four equivalent Ga(2) atoms. In the second Sc site, Sc(2) is bonded in a 4-coordinate geometry to one Ga(1) and four equivalent Ga(2) atoms. In the third Sc site, Sc(3) is bonded in a 4-coordinate geometry to two equivalent Ga(1) and two equivalent Ga(2) atoms. In the fourth Sc site, Sc(4) is bonded in a 6-coordinate geometry to two equivalent Ga(1) and four equivalent Ga(2) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to two equivalent Sc(1), two equivalent Sc(2), two equivalent Sc(3), and two equivalent Sc(4) atoms. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Sc(3), two equivalent Sc(1), two equivalent Sc(4), four equivalent Sc(2), and one Ga(2) atom.
Sc5Ga3 crystallizes in the monoclinic C2/m space group. There are four inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 6-coordinate geometry to two equivalent Ga(1) and four equivalent Ga(2) atoms. Both Sc(1)-Ga(1) bond lengths are 2.89 Å. There are two shorter (2.82 Å) and two longer (3.00 Å) Sc(1)-Ga(2) bond lengths. In the second Sc site, Sc(2) is bonded in a 4-coordinate geometry to one Ga(1) and four equivalent Ga(2) atoms. The Sc(2)-Ga(1) bond length is 2.84 Å. There are a spread of Sc(2)-Ga(2) bond distances ranging from 2.84-3.46 Å. In the third Sc site, Sc(3) is bonded in a 4-coordinate geometry to two equivalent Ga(1) and two equivalent Ga(2) atoms. There is one shorter (2.93 Å) and one longer (2.96 Å) Sc(3)-Ga(1) bond length. Both Sc(3)-Ga(2) bond lengths are 2.84 Å. In the fourth Sc site, Sc(4) is bonded in a 6-coordinate geometry to two equivalent Ga(1) and four equivalent Ga(2) atoms. Both Sc(4)-Ga(1) bond lengths are 2.89 Å. There are two shorter (2.80 Å) and two longer (2.95 Å) Sc(4)-Ga(2) bond lengths. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 8-coordinate geometry to two equivalent Sc(1), two equivalent Sc(2), two equivalent Sc(3), and two equivalent Sc(4) atoms. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to one Sc(3), two equivalent Sc(1), two equivalent Sc(4), four equivalent Sc(2), and one Ga(2) atom. The Ga(2)-Ga(2) bond length is 3.01 Å.