Materials Data on K3Ta3(BO6)2 by Materials Project
K3Ta3B2O12 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. K1+ is bonded in a 2-coordinate geometry to thirteen O2- atoms. There are a spread of K–O bond distances ranging from 2.81–3.17 Å. Ta5+ is bonded to six O2- atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 8–29°. There are a spread of Ta–O bond distances ranging from 1.96–2.05 Å. B3+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All B–O bond lengths are 1.38 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four equivalent K1+, one Ta5+, and one B3+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to three equivalent K1+ and two equivalent Ta5+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent K1+ and two equivalent Ta5+ atoms.