ErOF is Fluorite-derived structured and crystallizes in the trigonal R-3m space group. Er(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent F(1) atoms. O(1) is bonded to four equivalent Er(1) atoms to form OEr4 tetrahedra that share corners with six equivalent O(1)Er4 tetrahedra, corners with ten equivalent F(1)Er4 tetrahedra, edges with three equivalent O(1)Er4 tetrahedra, and edges with three equivalent F(1)Er4 tetrahedra. F(1) is bonded to four equivalent Er(1) atoms to form FEr4 tetrahedra that share corners with six equivalent F(1)Er4 tetrahedra, corners with ten equivalent O(1)Er4 tetrahedra, edges with three equivalent O(1)Er4 tetrahedra, and edges with three equivalent F(1)Er4 tetrahedra.
ErOF is Fluorite-derived structured and crystallizes in the trigonal R-3m space group. Er(1) is bonded in a body-centered cubic geometry to four equivalent O(1) and four equivalent F(1) atoms. There are three shorter (2.23 Å) and one longer (2.24 Å) Er(1)-O(1) bond length. There is one shorter (2.39 Å) and three longer (2.40 Å) Er(1)-F(1) bond lengths. O(1) is bonded to four equivalent Er(1) atoms to form OEr4 tetrahedra that share corners with six equivalent O(1)Er4 tetrahedra, corners with ten equivalent F(1)Er4 tetrahedra, edges with three equivalent O(1)Er4 tetrahedra, and edges with three equivalent F(1)Er4 tetrahedra. F(1) is bonded to four equivalent Er(1) atoms to form FEr4 tetrahedra that share corners with six equivalent F(1)Er4 tetrahedra, corners with ten equivalent O(1)Er4 tetrahedra, edges with three equivalent O(1)Er4 tetrahedra, and edges with three equivalent F(1)Er4 tetrahedra.