DOE OSTI2020
W2N3 is Corundum-like structured and crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are three inequivalent W+4.50+ sites. In the first W+4.50+ site, W+4.50+ is bonded to six N3- atoms to form a mixture of distorted edge and corner-sharing WN6 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 4–45°. There are a spread of W–N bond distances ranging from 2.10–2.13 Å. In the second W+4.50+ site, W+4.50+ is bonded to six N3- atoms to form a mixture of distorted edge, face, and corner-sharing WN6 pentagonal pyramids. The corner-sharing octahedral tilt angles are 0°. There are a spread of W–N bond distances ranging from 2.07–2.10 Å. In the third W+4.50+ site, W+4.50+ is bonded to six N3- atoms to form a mixture of edge, face, and corner-sharing WN6 octahedra. There are a spread of W–N bond distances ranging from 1.99–2.13 Å. There are four inequivalent N3- sites. In the first N3- site, N3- is bonded in a rectangular see-saw-like geometry to four W+4.50+ atoms. In the second N3- site, N3- is bonded in a rectangular see-saw-like geometry to four W+4.50+ atoms. In the third N3- site, N3- is bonded in a rectangular see-saw-like geometry to four W+4.50+ atoms. In the fourth N3- site, N3- is bonded in a rectangular see-saw-like geometry to four W+4.50+ atoms.