Materials Data on BaNb2O6 by Materials Project

Abstract

BaNb2O6 crystallizes in the orthorhombic Pmma space group. The structure is three-dimensional. Ba2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are four shorter (2.83 Å) and two longer (2.92 Å) Ba–O bond lengths. Nb5+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 0–47°. There are a spread of Nb–O bond distances ranging from 1.96–2.10 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms. In the second O2- site, O2- is bonded to two equivalent Ba2+ and two equivalent Nb5+ atoms to form a mixture of distorted edge and corner-sharing OBa2Nb2 tetrahedra. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+ and two equivalent Nb5+ atoms. In the fourth O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms.