Er2Ge5 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(5), four equivalent Ge(1), and four equivalent Ge(2) atoms. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), two equivalent Ge(4), and four equivalent Ge(5) atoms. There are five inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), four equivalent Er(1), and two equivalent Ge(5) atoms. In the third Ge site, Ge(3) is bonded in a 7-coordinate geometry to two equivalent Er(2) and five equivalent Ge(4) atoms. In the fourth Ge site, Ge(4) is bonded in a 7-coordinate geometry to two equivalent Er(2) and five equivalent Ge(3) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Er(1), four equivalent Er(2), and two equivalent Ge(2) atoms.
Er2Ge5 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(5), four equivalent Ge(1), and four equivalent Ge(2) atoms. Both Er(1)-Ge(5) bond lengths are 3.19 Å. There are two shorter (3.00 Å) and two longer (3.08 Å) Er(1)-Ge(1) bond lengths. All Er(1)-Ge(2) bond lengths are 2.91 Å. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), two equivalent Ge(4), and four equivalent Ge(5) atoms. Both Er(2)-Ge(2) bond lengths are 3.24 Å. Both Er(2)-Ge(3) bond lengths are 2.97 Å. Both Er(2)-Ge(4) bond lengths are 2.97 Å. All Er(2)-Ge(5) bond lengths are 2.93 Å. There are five inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to four equivalent Er(1) and four equivalent Ge(1) atoms. All Ge(1)-Ge(1) bond lengths are 2.78 Å. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), four equivalent Er(1), and two equivalent Ge(5) atoms. Both Ge(2)-Ge(5) bond lengths are 2.52 Å. In the third Ge site, Ge(3) is bonded in a 7-coordinate geometry to two equivalent Er(2) and five equivalent Ge(4) atoms. There is one shorter (2.47 Å) and four longer (2.78 Å) Ge(3)-Ge(4) bond lengths. In the fourth Ge site, Ge(4) is bonded in a 7-coordinate geometry to two equivalent Er(2) and five equivalent Ge(3) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Er(1), four equivalent Er(2), and two equivalent Ge(2) atoms.