ErF3 is Cementite structured and crystallizes in the orthorhombic Pnma space group. Er(1) is bonded in a 9-coordinate geometry to three equivalent F(2) and six equivalent F(1) atoms. There are two inequivalent F sites. In the first F site, F(2) is bonded in a 3-coordinate geometry to three equivalent Er(1) atoms. In the second F site, F(1) is bonded in a distorted trigonal planar geometry to three equivalent Er(1) atoms.
ErF3 is Cementite structured and crystallizes in the orthorhombic Pnma space group. Er(1) is bonded in a 9-coordinate geometry to three equivalent F(2) and six equivalent F(1) atoms. There are two shorter (2.26 Å) and one longer (2.49 Å) Er(1)-F(2) bond length. There are four shorter (2.26 Å) and two longer (2.27 Å) Er(1)-F(1) bond lengths. There are two inequivalent F sites. In the first F site, F(2) is bonded in a 3-coordinate geometry to three equivalent Er(1) atoms. In the second F site, F(1) is bonded in a distorted trigonal planar geometry to three equivalent Er(1) atoms.