Materials Data on Na6Bi2B4PO16 by Materials Project
Na6B4Bi2PO16 crystallizes in the cubic Fd-3 space group. The structure is three-dimensional. Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with eight equivalent NaO6 octahedra, edges with two equivalent BiO6 octahedra, and an edgeedge with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 60–83°. There are a spread of Na–O bond distances ranging from 2.41–2.52 Å. B3+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All B–O bond lengths are 1.39 Å. Bi5+ is bonded to six equivalent O2- atoms to form BiO6 octahedra that share edges with six equivalent NaO6 octahedra. All Bi–O bond lengths are 2.26 Å. P4+ is bonded to four equivalent O2- atoms to form PO4 tetrahedra that share edges with six equivalent NaO6 octahedra. All P–O bond lengths are 1.56 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Na1+ and one P4+ atom to form distorted edge-sharing ONa3P trigonal pyramids. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Na1+, one B3+, and one Bi5+ atom.