Materials Data on Nb2CoO6 by Materials Project
CoNb2O6 is beta Vanadium nitride-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with three equivalent NbO6 octahedra, corners with five equivalent CoO6 octahedra, and edges with two NbO6 octahedra. The corner-sharing octahedra tilt angles range from 46–53°. There are a spread of Nb–O bond distances ranging from 1.87–2.16 Å. In the second Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two equivalent NbO6 octahedra, corners with six equivalent CoO6 octahedra, and edges with two equivalent NbO6 octahedra. The corner-sharing octahedra tilt angles range from 45–52°. All Nb–O bond lengths are 2.02 Å. In the third Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with eight NbO6 octahedra and edges with two equivalent CoO6 octahedra. The corner-sharing octahedra tilt angles range from 45–50°. There are a spread of Nb–O bond distances ranging from 1.98–2.09 Å. Co2+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with eight NbO6 octahedra, an edgeedge with one NbO6 octahedra, and an edgeedge with one CoO6 octahedra. The corner-sharing octahedra tilt angles range from 47–53°. There are a spread of Co–O bond distances ranging from 2.06–2.13 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to one Nb5+ and two equivalent Co2+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Nb5+ and one Co2+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Nb5+ and one Co2+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Nb5+ and one Co2+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Nb5+ atoms.