Materials Data on Ti5Nb2O14 by Materials Project
Ti5Nb2O14 is Rutile-derived structured and crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. there are six inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent TiO6 octahedra, corners with four equivalent NbO6 octahedra, and edges with two TiO6 octahedra. The corner-sharing octahedra tilt angles range from 48–50°. There are a spread of Ti–O bond distances ranging from 1.96–2.03 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent TiO6 octahedra, corners with four equivalent NbO6 octahedra, and edges with two TiO6 octahedra. The corner-sharing octahedra tilt angles range from 48–50°. There are a spread of Ti–O bond distances ranging from 1.97–2.03 Å. In the third Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent TiO6 octahedra, corners with four equivalent NbO6 octahedra, and edges with two TiO6 octahedra. The corner-sharing octahedra tilt angles range from 47–52°. There are a spread of Ti–O bond distances ranging from 1.95–2.03 Å. In the fourth Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with eight equivalent NbO6 octahedra and edges with two equivalent TiO6 octahedra. The corner-sharing octahedra tilt angles range from 48–49°. There is four shorter (1.98 Å) and two longer (2.01 Å) Ti–O bond length. In the fifth Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with eight equivalent TiO6 octahedra and edges with two equivalent NbO6 octahedra. The corner-sharing octahedra tilt angles range from 48–49°. There are four shorter (1.99 Å) and two longer (2.03 Å) Ti–O bond lengths. In the sixth Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with eight TiO6 octahedra and edges with two NbO6 octahedra. The corner-sharing octahedra tilt angles range from 47–50°. There are a spread of Ti–O bond distances ranging from 1.98–2.03 Å. There are two inequivalent Nb4+ sites. In the first Nb4+ site, Nb4+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with eight TiO6 octahedra and edges with two TiO6 octahedra. The corner-sharing octahedra tilt angles range from 48–50°. There are a spread of Nb–O bond distances ranging from 2.02–2.04 Å. In the second Nb4+ site, Nb4+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with eight TiO6 octahedra, an edgeedge with one TiO6 octahedra, and an edgeedge with one NbO6 octahedra. The corner-sharing octahedra tilt angles range from 47–52°. There are a spread of Nb–O bond distances ranging from 1.99–2.06 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ti4+ and one Nb4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ti4+ and one Nb4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ti4+ and one Nb4+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ti4+ and one Nb4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+ and two equivalent Nb4+ atoms. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ti4+ atoms. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ti4+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ti4+ and one Nb4+ atom.