Materials Data on K3Li2Ta6(PO8)3 by Materials Project
K3Li2Ta6(PO8)3 crystallizes in the trigonal R3 space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.97–3.44 Å. There are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a 3-coordinate geometry to six O2- atoms. There are three shorter (2.02 Å) and three longer (2.40 Å) Li–O bond lengths. In the second Li1+ site, Li1+ is bonded in a 3-coordinate geometry to six O2- atoms. There are three shorter (2.02 Å) and three longer (2.41 Å) Li–O bond lengths. There are two inequivalent Ta+4.67+ sites. In the first Ta+4.67+ site, Ta+4.67+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with four TaO6 octahedra and corners with two equivalent PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 5–36°. There are a spread of Ta–O bond distances ranging from 1.92–2.26 Å. In the second Ta+4.67+ site, Ta+4.67+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with four TaO6 octahedra and corners with two equivalent PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 5–36°. There are a spread of Ta–O bond distances ranging from 1.91–2.28 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four TaO6 octahedra. The corner-sharing octahedra tilt angles range from 41–42°. There is three shorter (1.55 Å) and one longer (1.56 Å) P–O bond length. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent K1+ and two Ta+4.67+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two Ta+4.67+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Ta+4.67+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Li1+, and two equivalent Ta+4.67+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one K1+, one Ta+4.67+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Ta+4.67+, and one P5+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to one K1+, one Li1+, one Ta+4.67+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent K1+, one Li1+, and two equivalent Ta+4.67+ atoms.