Materials Data on Li2AlPCO7 by Materials Project
Li2AlCPO7 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Li1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 1.97–2.28 Å. Al3+ is bonded to six O2- atoms to form AlO6 octahedra that share corners with four equivalent PO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.84–2.03 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.27–1.33 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent AlO6 octahedra. The corner-sharing octahedra tilt angles range from 42–48°. There is two shorter (1.54 Å) and two longer (1.56 Å) P–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Li1+ and one C4+ atom. In the second O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Li1+, one Al3+, and one C4+ atom. In the third O2- site, O2- is bonded in a distorted tetrahedral geometry to two equivalent Li1+, one Al3+, and one C4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Al3+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Li1+, one Al3+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Al3+ and one P5+ atom.