Er2Te3 crystallizes in the orthorhombic Fddd space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form a mixture of corner and edge-sharing ErTe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second Er site, Er(2) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form a mixture of corner and edge-sharing ErTe6 octahedra. The corner-sharing octahedral tilt angles are 2°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a rectangular see-saw-like geometry to two equivalent Er(1) and two equivalent Er(2) atoms. In the second Te site, Te(2) is bonded in a rectangular see-saw-like geometry to two equivalent Er(1) and two equivalent Er(2) atoms.
Er2Te3 crystallizes in the orthorhombic Fddd space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form a mixture of corner and edge-sharing ErTe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. Both Er(1)-Te(2) bond lengths are 3.05 Å. All Er(1)-Te(1) bond lengths are 3.04 Å. In the second Er site, Er(2) is bonded to two equivalent Te(2) and four equivalent Te(1) atoms to form a mixture of corner and edge-sharing ErTe6 octahedra. The corner-sharing octahedral tilt angles are 2°. Both Er(2)-Te(2) bond lengths are 3.05 Å. There are two shorter (3.04 Å) and two longer (3.07 Å) Er(2)-Te(1) bond lengths. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a rectangular see-saw-like geometry to two equivalent Er(1) and two equivalent Er(2) atoms. In the second Te site, Te(2) is bonded in a rectangular see-saw-like geometry to two equivalent Er(1) and two equivalent Er(2) atoms.