Materials Data on Ti3Nb(CuO4)3 by Materials Project
Ti3Nb(CuO4)3 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent NbO6 octahedra and corners with four equivalent TiO6 octahedra. The corner-sharing octahedra tilt angles range from 41–42°. There is four shorter (1.99 Å) and two longer (2.00 Å) Ti–O bond length. Nb5+ is bonded to six equivalent O2- atoms to form NbO6 octahedra that share corners with six equivalent TiO6 octahedra. The corner-sharing octahedral tilt angles are 42°. All Nb–O bond lengths are 2.01 Å. Cu+2.33+ is bonded in a square co-planar geometry to four O2- atoms. All Cu–O bond lengths are 1.93 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ti4+ and one Cu+2.33+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ti4+, one Nb5+, and one Cu+2.33+ atom.