NaY(SeO3)4 crystallizes in the tetragonal P4/mmm space group. Na(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form NaO12 cuboctahedra that share corners with four equivalent Na(1)O12 cuboctahedra, corners with eight equivalent Y(1)O12 cuboctahedra, and faces with eight equivalent Se(1)O6 octahedra. Y(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form YO12 cuboctahedra that share corners with four equivalent Y(1)O12 cuboctahedra, corners with eight equivalent Na(1)O12 cuboctahedra, and faces with eight equivalent Se(1)O6 octahedra. Se(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form SeO6 octahedra that share corners with six equivalent Se(1)O6 octahedra, faces with two equivalent Na(1)O12 cuboctahedra, and faces with two equivalent Y(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-12°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted square co-planar geometry to one Na(1), one Y(1), and two equivalent Se(1) atoms. In the second O site, O(2) is bonded in a square co-planar geometry to two equivalent Na(1) and two equivalent Se(1) atoms. In the third O site, O(3) is bonded in a distorted square co-planar geometry to two equivalent Y(1) and two equivalent Se(1) atoms.
NaY(SeO3)4 crystallizes in the tetragonal P4/mmm space group. Na(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form NaO12 cuboctahedra that share corners with four equivalent Na(1)O12 cuboctahedra, corners with eight equivalent Y(1)O12 cuboctahedra, and faces with eight equivalent Se(1)O6 octahedra. All Na(1)-O(2) bond lengths are 2.70 Å. All Na(1)-O(1) bond lengths are 2.86 Å. Y(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form YO12 cuboctahedra that share corners with four equivalent Y(1)O12 cuboctahedra, corners with eight equivalent Na(1)O12 cuboctahedra, and faces with eight equivalent Se(1)O6 octahedra. All Y(1)-O(3) bond lengths are 2.70 Å. All Y(1)-O(1) bond lengths are 2.53 Å. Se(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form SeO6 octahedra that share corners with six equivalent Se(1)O6 octahedra, faces with two equivalent Na(1)O12 cuboctahedra, and faces with two equivalent Y(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-12°. The Se(1)-O(2) bond length is 1.87 Å. The Se(1)-O(3) bond length is 1.94 Å. All Se(1)-O(1) bond lengths are 1.92 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted square co-planar geometry to one Na(1), one Y(1), and two equivalent Se(1) atoms. In the second O site, O(2) is bonded in a square co-planar geometry to two equivalent Na(1) and two equivalent Se(1) atoms. In the third O site, O(3) is bonded in a distorted square co-planar geometry to two equivalent Y(1) and two equivalent Se(1) atoms.