Materials Data on Na2(WO3)3 by Materials Project
Na2(WO3)3 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Na1+ is bonded to twelve O2- atoms to form NaO12 cuboctahedra that share corners with nine equivalent NaO12 cuboctahedra, faces with three equivalent NaO12 cuboctahedra, and faces with eight WO6 octahedra. There are a spread of Na–O bond distances ranging from 2.76–2.78 Å. There are two inequivalent W+5.33+ sites. In the first W+5.33+ site, W+5.33+ is bonded to six equivalent O2- atoms to form WO6 octahedra that share corners with six equivalent WO6 octahedra and faces with six equivalent NaO12 cuboctahedra. The corner-sharing octahedral tilt angles are 2°. All W–O bond lengths are 1.95 Å. In the second W+5.33+ site, W+5.33+ is bonded to six O2- atoms to form WO6 octahedra that share corners with six WO6 octahedra and faces with five equivalent NaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–2°. There is three shorter (1.95 Å) and three longer (2.00 Å) W–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Na1+ and two W+5.33+ atoms to form a mixture of distorted edge, corner, and face-sharing ONa3W2 square pyramids. In the second O2- site, O2- is bonded in a distorted square co-planar geometry to two equivalent Na1+ and two equivalent W+5.33+ atoms.