Materials Data on NbTl(BO3)2 by Materials Project
NbTl(BO3)2 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. Nb5+ is bonded to six O2- atoms to form distorted corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are a spread of Nb–O bond distances ranging from 1.81–2.28 Å. Tl1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Tl–O bond distances ranging from 2.79–3.41 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.37 Å) and one longer (1.41 Å) B–O bond length. In the second B3+ site, B3+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.36 Å) and one longer (1.40 Å) B–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Nb5+, one Tl1+, and one B3+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Nb5+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Nb5+, one Tl1+, and one B3+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to two equivalent Tl1+ and two B3+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Nb5+, two equivalent Tl1+, and one B3+ atom. In the sixth O2- site, O2- is bonded in a distorted linear geometry to one Nb5+, one Tl1+, and one B3+ atom.