NaSe crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent Se(1) atoms to form edge-sharing NaSe6 octahedra. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. Se(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), three equivalent Na(2), and one Se(1) atom.
NaSe crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to six equivalent Se(1) atoms to form edge-sharing NaSe6 octahedra. All Na(1)-Se(1) bond lengths are 3.06 Å. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to six equivalent Se(1) atoms. All Na(2)-Se(1) bond lengths are 2.95 Å. Se(1) is bonded in a 7-coordinate geometry to three equivalent Na(1), three equivalent Na(2), and one Se(1) atom. The Se(1)-Se(1) bond length is 2.45 Å.