Y2SeO2 crystallizes in the trigonal P-3m1 space group. Y(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 Y(1) atoms to form SeY6 octahedra that share corners with twelve equivalent O(1)Y4 tetrahedra, edges with six equivalent Se(1)Y6 octahedra, and edges with six equivalent O(1)Y4 tetrahedra. O(1) is bonded to four equivalent Y(1) atoms to form OY4 tetrahedra that share corners with six equivalent Se(1)Y6 octahedra, corners with six equivalent O(1)Y4 tetrahedra, edges with three equivalent Se(1)Y6 octahedra, and edges with three equivalent O(1)Y4 tetrahedra. The corner-sharing octahedral tilt angles range from 27-48°.
Y2SeO2 crystallizes in the trigonal P-3m1 space group. Y(1) is bonded in a 7-coordinate geometry to three equivalent Se(1) and four equivalent O(1) atoms. All Y(1)-Se(1) bond lengths are 2.97 Å. All Y(1)-O(1) bond lengths are 2.28 Å. Se(1) is bonded to six equivalent Y(1) atoms to form SeY6 octahedra that share corners with twelve equivalent O(1)Y4 tetrahedra, edges with six equivalent Se(1)Y6 octahedra, and edges with six equivalent O(1)Y4 tetrahedra. O(1) is bonded to four equivalent Y(1) atoms to form OY4 tetrahedra that share corners with six equivalent Se(1)Y6 octahedra, corners with six equivalent O(1)Y4 tetrahedra, edges with three equivalent Se(1)Y6 octahedra, and edges with three equivalent O(1)Y4 tetrahedra. The corner-sharing octahedral tilt angles range from 27-48°.