Materials Data on Li9Bi3P8O29 by Materials Project
Li9Bi3P8O29 crystallizes in the trigonal P-3c1 space group. The structure is three-dimensional. there are three inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four O2- atoms to form distorted LiO4 tetrahedra that share corners with two equivalent LiO4 tetrahedra, corners with four PO4 tetrahedra, and an edgeedge with one BiO6 octahedra. There are a spread of Li–O bond distances ranging from 1.94–2.16 Å. In the second Li1+ site, Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with three equivalent BiO6 octahedra and corners with four PO4 tetrahedra. The corner-sharing octahedral tilt angles are 76°. There is one shorter (1.78 Å) and three longer (2.13 Å) Li–O bond length. In the third Li1+ site, Li1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. All Li–O bond lengths are 2.49 Å. Bi3+ is bonded to six O2- atoms to form BiO6 octahedra that share corners with two equivalent LiO4 tetrahedra, corners with six PO4 tetrahedra, and edges with two equivalent LiO4 tetrahedra. There are a spread of Bi–O bond distances ranging from 2.33–2.38 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent BiO6 octahedra, a cornercorner with one PO4 tetrahedra, and corners with four LiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 55–56°. There are a spread of P–O bond distances ranging from 1.52–1.63 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent BiO6 octahedra and corners with four LiO4 tetrahedra. The corner-sharing octahedral tilt angles are 46°. There is one shorter (1.50 Å) and three longer (1.57 Å) P–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to one Li1+ and one P5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Bi3+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Li1+, one Bi3+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent P5+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Bi3+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to three Li1+ and one P5+ atom.