Er2TeO2 crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded in a 4-coordinate geometry to three equivalent Te(1) and four equivalent O(1) atoms. Te(1) is bonded to six equivalent Er(1) atoms to form distorted TeEr6 pentagonal pyramids that share corners with twelve equivalent O(1)Er4 tetrahedra, edges with six equivalent Te(1)Er6 pentagonal pyramids, and edges with six equivalent O(1)Er4 tetrahedra. O(1) is bonded to four equivalent Er(1) atoms to form OEr4 tetrahedra that share corners with six equivalent Te(1)Er6 pentagonal pyramids, corners with six equivalent O(1)Er4 tetrahedra, edges with three equivalent Te(1)Er6 pentagonal pyramids, and edges with three equivalent O(1)Er4 tetrahedra.
Er2TeO2 crystallizes in the hexagonal P6_3/mmc space group. Er(1) is bonded in a 4-coordinate geometry to three equivalent Te(1) and four equivalent O(1) atoms. All Er(1)-Te(1) bond lengths are 3.14 Å. There is one shorter (2.26 Å) and three longer (2.31 Å) Er(1)-O(1) bond lengths. Te(1) is bonded to six equivalent Er(1) atoms to form distorted TeEr6 pentagonal pyramids that share corners with twelve equivalent O(1)Er4 tetrahedra, edges with six equivalent Te(1)Er6 pentagonal pyramids, and edges with six equivalent O(1)Er4 tetrahedra. O(1) is bonded to four equivalent Er(1) atoms to form OEr4 tetrahedra that share corners with six equivalent Te(1)Er6 pentagonal pyramids, corners with six equivalent O(1)Er4 tetrahedra, edges with three equivalent Te(1)Er6 pentagonal pyramids, and edges with three equivalent O(1)Er4 tetrahedra.