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DOE OSTI2020

Materials Data on Nb4N3 by Materials Project

Nb4N3 crystallizes in the tetragonal P4/mmm space group. The structure is two-dimensional and consists of one Nb4N3 sheet oriented in the (0, 0, 1) direction. Nb+2.25+ is bonded in a distorted rectangular see-saw-like geometry to four N3- atoms. There are two shorter (2.15 Å) and two longer (2.44 Å) Nb–N bond lengths. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a 4-coordinate geometry to four equivalent Nb+2.25+ atoms. In the second N3- site, N3- is bonded in a body-centered cubic geometry to eight equivalent Nb+2.25+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nb4N3 by Materials Project

Nb4N3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Nb+2.25+ sites. In the first Nb+2.25+ site, Nb+2.25+ is bonded in a square co-planar geometry to four N3- atoms. There are two shorter (2.18 Å) and two longer (2.21 Å) Nb–N bond lengths. In the second Nb+2.25+ site, Nb+2.25+ is bonded to five N3- atoms to form a mixture of edge and corner-sharing NbN5 square pyramids. All Nb–N bond lengths are 2.21 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded to six Nb+2.25+ atoms to form a mixture of edge and corner-sharing NNb6 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second N3- site, N3- is bonded to six Nb+2.25+ atoms to form a mixture of edge and corner-sharing NNb6 octahedra. The corner-sharing octahedra tilt angles range from 0–2°.

36 MATERIALS SCIENCE↗