Er3Ga2Ge3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 9-coordinate geometry to four equivalent Ga(1), one Ge(2), and four equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to four equivalent Ga(1), two equivalent Ge(2), and four equivalent Ge(1) atoms. Ga(1) is bonded in a 10-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Ga(1), one Ge(2), and two equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), two equivalent Ga(1), and one Ge(2) atom. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Er(1), four equivalent Er(2), two equivalent Ga(1), and two equivalent Ge(1) atoms.
Er3Ga2Ge3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 9-coordinate geometry to four equivalent Ga(1), one Ge(2), and four equivalent Ge(1) atoms. There are two shorter (2.82 Å) and two longer (3.10 Å) Er(1)-Ga(1) bond lengths. The Er(1)-Ge(2) bond length is 2.87 Å. There are two shorter (2.95 Å) and two longer (3.27 Å) Er(1)-Ge(1) bond lengths. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to four equivalent Ga(1), two equivalent Ge(2), and four equivalent Ge(1) atoms. There are two shorter (3.06 Å) and two longer (3.12 Å) Er(2)-Ga(1) bond lengths. Both Er(2)-Ge(2) bond lengths are 2.99 Å. There are two shorter (2.95 Å) and two longer (3.20 Å) Er(2)-Ge(1) bond lengths. Ga(1) is bonded in a 10-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Ga(1), one Ge(2), and two equivalent Ge(1) atoms. The Ga(1)-Ga(1) bond length is 2.76 Å. The Ga(1)-Ge(2) bond length is 2.79 Å. Both Ga(1)-Ge(1) bond lengths are 2.64 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), two equivalent Ga(1), and one Ge(2) atom. The Ge(1)-Ge(2) bond length is 2.61 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Er(1), four equivalent Er(2), two equivalent Ga(1), and two equivalent Ge(1) atoms.