Er2CrGe4 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 11-coordinate geometry to one Cr(1), 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. Cr(1) is bonded in a 5-coordinate geometry to one Er(1), 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 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Cr(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 Cr(1) atoms. In the fourth Ge site, Ge(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Cr(1) atoms.
Er2CrGe4 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 11-coordinate geometry to one Cr(1), two equivalent Ge(1), two equivalent Ge(3), two equivalent Ge(4), and four equivalent Ge(2) atoms. The Er(1)-Cr(1) bond length is 2.97 Å. Both Er(1)-Ge(1) bond lengths are 3.16 Å. Both Er(1)-Ge(3) bond lengths are 3.08 Å. Both Er(1)-Ge(4) bond lengths are 3.12 Å. All Er(1)-Ge(2) bond lengths are 3.10 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 3.28 Å. Both Er(2)-Ge(3) bond lengths are 3.19 Å. Both Er(2)-Ge(4) bond lengths are 3.14 Å. All Er(2)-Ge(1) bond lengths are 3.14 Å. Cr(1) is bonded in a 5-coordinate geometry to one Er(1), one Ge(1), two equivalent Ge(3), and two equivalent Ge(4) atoms. The Cr(1)-Ge(1) bond length is 2.37 Å. Both Cr(1)-Ge(3) bond lengths are 2.29 Å. Both Cr(1)-Ge(4) bond lengths are 2.25 Å. There are four 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), one Cr(1), and two equivalent Ge(2) atoms. Both Ge(1)-Ge(2) bond lengths are 2.73 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 Cr(1) atoms. In the fourth Ge site, Ge(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Cr(1) atoms.