Er3Ir is Cementite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 3-coordinate geometry to three equivalent Ir(1) atoms. In the second Er site, Er(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Ir(1) atoms. Ir(1) is bonded in a 8-coordinate geometry to two equivalent Er(2) and six equivalent Er(1) atoms.
Er3Ir is Cementite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 3-coordinate geometry to three equivalent Ir(1) atoms. There are a spread of Er(1)-Ir(1) bond distances ranging from 2.82-3.16 Å. In the second Er site, Er(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Ir(1) atoms. There is one shorter (2.71 Å) and one longer (2.82 Å) Er(2)-Ir(1) bond length. Ir(1) is bonded in a 8-coordinate geometry to two equivalent Er(2) and six equivalent Er(1) atoms.