Materials Data on KTa2O6 by Materials Project

Abstract

KTa2O6 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. K is bonded in a hexagonal planar geometry to six O atoms. There are two shorter (2.75 Å) and four longer (2.76 Å) K–O bond lengths. There are two inequivalent Ta sites. In the first Ta site, Ta is bonded to six O atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 36–38°. There is four shorter (1.99 Å) and two longer (2.00 Å) Ta–O bond length. In the second Ta site, Ta is bonded to six O atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles are 38°. There is four shorter (1.99 Å) and two longer (2.00 Å) Ta–O bond length. There are three inequivalent O sites. In the first O site, O is bonded in a 4-coordinate geometry to two equivalent K and two equivalent Ta atoms. In the second O site, O is bonded in a bent 150 degrees geometry to two equivalent Ta atoms. In the third O site, O is bonded in a 2-coordinate geometry to one K and two Ta atoms.