Materials Data on NaSiPCO7 by Materials Project

NaSiCPO7 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. Na1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.22–2.56 Å. Si4+ is bonded to six O2- atoms to form SiO6 octahedra that share corners with four equivalent PO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.75–1.84 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of C–O bond distances ranging from 1.22–1.35 Å. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent SiO6 octahedra. The corner-sharing octahedra tilt angles range from 24–40°. There are a spread of P–O bond distances ranging from 1.53–1.55 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Na1+ and one C4+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Si4+, and one C4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Si4+, and one C4+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to one Si4+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+, one Si4+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to one Si4+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a bent 150 degrees geometry to one Si4+ and one P5+ atom.