Materials Data on Li3Nb7O19 by Materials Project
Li3Nb7O19 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Li1+ is bonded in a linear geometry to two equivalent O2- atoms. Both Li–O bond lengths are 1.88 Å. There are two inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded to seven O2- atoms to form distorted NbO7 pentagonal bipyramids that share a cornercorner with one NbO6 octahedra, corners with three equivalent NbO7 pentagonal bipyramids, and edges with four equivalent NbO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 47°. There are a spread of Nb–O bond distances ranging from 1.94–2.48 Å. In the second Nb5+ site, Nb5+ is bonded to six equivalent O2- atoms to form corner-sharing NbO6 octahedra. All Nb–O bond lengths are 2.02 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Nb5+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+ and two Nb5+ atoms. In the third O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to three equivalent Nb5+ atoms. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Nb5+ atoms.