Er3Fe2Ge3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to four equivalent Fe(1), two equivalent Ge(2), and five equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded in a 9-coordinate geometry to four equivalent Fe(1), two equivalent Ge(1), and three equivalent Ge(2) atoms. Fe(1) is bonded in a 10-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Ge(2), and three equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to one Er(2), five equivalent Er(1), three equivalent Fe(1), and one Ge(1) atom. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to three equivalent Er(2), four equivalent Er(1), and two equivalent Fe(1) atoms.
Er3Fe2Ge3 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to four equivalent Fe(1), two equivalent Ge(2), and five equivalent Ge(1) atoms. There are a spread of Er(1)-Fe(1) bond distances ranging from 3.02-3.14 Å. Both Er(1)-Ge(2) bond lengths are 2.96 Å. There are a spread of Er(1)-Ge(1) bond distances ranging from 2.97-3.28 Å. In the second Er site, Er(2) is bonded in a 9-coordinate geometry to four equivalent Fe(1), two equivalent Ge(1), and three equivalent Ge(2) atoms. All Er(2)-Fe(1) bond lengths are 3.17 Å. Both Er(2)-Ge(1) bond lengths are 2.87 Å. There are two shorter (2.90 Å) and one longer (3.25 Å) Er(2)-Ge(2) bond length. Fe(1) is bonded in a 10-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Ge(2), and three equivalent Ge(1) atoms. The Fe(1)-Ge(2) bond length is 2.59 Å. There are two shorter (2.36 Å) and one longer (2.42 Å) Fe(1)-Ge(1) bond length. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to one Er(2), five equivalent Er(1), three equivalent Fe(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.84 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to three equivalent Er(2), four equivalent Er(1), and two equivalent Fe(1) atoms.