Er2MnGe4 crystallizes in the orthorhombic Amm2 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(1), two equivalent Ge(3), two equivalent Ge(4), 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(1) atoms. Mn(1) is bonded in a 5-coordinate geometry to one Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a distorted single-bond geometry to two equivalent Er(1), four equivalent Er(2), one Mn(1), and two equivalent Ge(2) 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(1) atoms. In the third Ge site, Ge(3) is bonded in a 2-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Mn(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 2-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Mn(1) atoms.
Er2MnGe4 crystallizes in the orthorhombic Amm2 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(1), two equivalent Ge(3), two equivalent Ge(4), and four equivalent Ge(2) atoms. Both Er(1)-Ge(1) bond lengths are 3.11 Å. Both Er(1)-Ge(3) bond lengths are 2.99 Å. Both Er(1)-Ge(4) bond lengths are 3.04 Å. All Er(1)-Ge(2) bond lengths are 3.04 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(1) atoms. Both Er(2)-Ge(2) bond lengths are 3.31 Å. Both Er(2)-Ge(3) bond lengths are 3.22 Å. Both Er(2)-Ge(4) bond lengths are 3.17 Å. All Er(2)-Ge(1) bond lengths are 3.10 Å. Mn(1) is bonded in a 5-coordinate geometry to one Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. The Mn(1)-Ge(1) bond length is 2.32 Å. Both Mn(1)-Ge(3) bond lengths are 2.32 Å. Both Mn(1)-Ge(4) bond lengths are 2.28 Å. There are four inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a distorted single-bond geometry to two equivalent Er(1), four equivalent Er(2), one Mn(1), and two equivalent Ge(2) atoms. Both Ge(1)-Ge(2) bond lengths are 2.70 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(1) atoms. In the third Ge site, Ge(3) is bonded in a 2-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Mn(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 2-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Mn(1) atoms.