Ho2SeO2 crystallizes in the trigonal P-3m1 space group. Ho(1) is bonded in a 7-coordinate geometry to three equivalent Se(1) and four equivalent O(1) atoms. Se(1) is bonded to six equivalent Ho(1) atoms to form SeHo6 octahedra that share corners with twelve equivalent O(1)Ho4 tetrahedra, edges with six equivalent Se(1)Ho6 octahedra, and edges with six equivalent O(1)Ho4 tetrahedra. O(1) is bonded to four equivalent Ho(1) atoms to form OHo4 tetrahedra that share corners with six equivalent Se(1)Ho6 octahedra, corners with six equivalent O(1)Ho4 tetrahedra, edges with three equivalent Se(1)Ho6 octahedra, and edges with three equivalent O(1)Ho4 tetrahedra. The corner-sharing octahedral tilt angles range from 28-48°.
Ho2SeO2 crystallizes in the trigonal P-3m1 space group. Ho(1) is bonded in a 7-coordinate geometry to three equivalent Se(1) and four equivalent O(1) atoms. All Ho(1)-Se(1) bond lengths are 2.95 Å. All Ho(1)-O(1) bond lengths are 2.26 Å. Se(1) is bonded to six equivalent Ho(1) atoms to form SeHo6 octahedra that share corners with twelve equivalent O(1)Ho4 tetrahedra, edges with six equivalent Se(1)Ho6 octahedra, and edges with six equivalent O(1)Ho4 tetrahedra. O(1) is bonded to four equivalent Ho(1) atoms to form OHo4 tetrahedra that share corners with six equivalent Se(1)Ho6 octahedra, corners with six equivalent O(1)Ho4 tetrahedra, edges with three equivalent Se(1)Ho6 octahedra, and edges with three equivalent O(1)Ho4 tetrahedra. The corner-sharing octahedral tilt angles range from 28-48°.