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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NaNb2O4 by Materials Project

NaNb2O4 crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one NaNb2O4 sheet oriented in the (0, 0, 1) direction. Na1+ is bonded to six equivalent O2- atoms to form distorted edge-sharing NaO6 octahedra. All Na–O bond lengths are 2.38 Å. Nb+3.50+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.08 Å) and three longer (2.19 Å) Nb–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Na1+ and three equivalent Nb+3.50+ atoms to form a mixture of edge and corner-sharing ONa3Nb3 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second O2- site, O2- is bonded in a distorted T-shaped geometry to three equivalent Nb+3.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaNb2O4 by Materials Project

NaNb2O4 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.38–2.56 Å. There are two inequivalent Nb+3.50+ sites. In the first Nb+3.50+ site, Nb+3.50+ is bonded to six O2- atoms to form distorted edge-sharing NbO6 pentagonal pyramids. There are four shorter (2.12 Å) and two longer (2.14 Å) Nb–O bond lengths. In the second Nb+3.50+ site, Nb+3.50+ is bonded to six O2- atoms to form distorted edge-sharing NbO6 pentagonal pyramids. There are a spread of Nb–O bond distances ranging from 2.11–2.14 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Na1+ and three Nb+3.50+ atoms. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to one Na1+ and three Nb+3.50+ atoms. In the third O2- site, O2- is bonded to two equivalent Na1+ and three Nb+3.50+ atoms to form a mixture of distorted edge, face, and corner-sharing ONa2Nb3 trigonal bipyramids.

36 MATERIALS SCIENCE↗