Er7(IrTe)2 crystallizes in the orthorhombic Imm2 space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to two equivalent Ir(1), one Te(2), and two equivalent Te(1) atoms. In the second Er site, Er(2) is bonded in a 4-coordinate geometry to three equivalent Ir(1) and one Te(1) atom. In the third Er site, Er(3) is bonded in a 4-coordinate geometry to two equivalent Ir(1) and two equivalent Te(2) atoms. In the fourth Er site, Er(4) is bonded in a 3-coordinate geometry to one Te(2) and two equivalent Te(1) atoms. Ir(1) is bonded in a 7-coordinate geometry to two equivalent Er(1), two equivalent Er(3), and three equivalent Er(2) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(4), and four equivalent Er(1) atoms. In the second Te site, Te(2) is bonded in a 7-coordinate geometry to one Er(4), two equivalent Er(1), and four equivalent Er(3) atoms.
Er7(IrTe)2 crystallizes in the orthorhombic Imm2 space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 5-coordinate geometry to two equivalent Ir(1), one Te(2), and two equivalent Te(1) atoms. Both Er(1)-Ir(1) bond lengths are 2.83 Å. The Er(1)-Te(2) bond length is 3.11 Å. Both Er(1)-Te(1) bond lengths are 3.19 Å. In the second Er site, Er(2) is bonded in a 4-coordinate geometry to three equivalent Ir(1) and one Te(1) atom. There are two shorter (2.84 Å) and one longer (3.09 Å) Er(2)-Ir(1) bond length. The Er(2)-Te(1) bond length is 3.17 Å. In the third Er site, Er(3) is bonded in a 4-coordinate geometry to two equivalent Ir(1) and two equivalent Te(2) atoms. Both Er(3)-Ir(1) bond lengths are 2.85 Å. Both Er(3)-Te(2) bond lengths are 3.17 Å. In the fourth Er site, Er(4) is bonded in a 3-coordinate geometry to one Te(2) and two equivalent Te(1) atoms. The Er(4)-Te(2) bond length is 3.19 Å. Both Er(4)-Te(1) bond lengths are 3.17 Å. Ir(1) is bonded in a 7-coordinate geometry to two equivalent Er(1), two equivalent Er(3), and three equivalent Er(2) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(4), and four equivalent Er(1) atoms. In the second Te site, Te(2) is bonded in a 7-coordinate geometry to one Er(4), two equivalent Er(1), and four equivalent Er(3) atoms.