Materials Data on Na4Ni7(PO4)6 by Materials Project
Na4Ni7(PO4)6 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.48–2.63 Å. In the second Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.43–3.04 Å. In the third Na1+ site, Na1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Na–O bond distances ranging from 2.36–2.60 Å. There are four inequivalent Ni2+ sites. In the first Ni2+ site, Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three NiO6 octahedra, corners with four PO4 tetrahedra, an edgeedge with one NiO6 octahedra, and an edgeedge with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 59–68°. There are a spread of Ni–O bond distances ranging from 2.02–2.20 Å. In the second Ni2+ site, Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with three NiO6 octahedra, corners with four PO4 tetrahedra, an edgeedge with one NiO6 octahedra, and an edgeedge with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 57–69°. There are a spread of Ni–O bond distances ranging from 2.03–2.18 Å. In the third Ni2+ site, Ni2+ is bonded to six O2- atoms to form distorted NiO6 octahedra that share corners with four NiO6 octahedra, corners with two PO4 tetrahedra, an edgeedge with one NiO6 octahedra, and edges with two PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 59–69°. There are a spread of Ni–O bond distances ranging from 2.04–2.38 Å. In the fourth Ni2+ site, Ni2+ is bonded to six O2- atoms to form NiO6 octahedra that share corners with four NiO6 octahedra and corners with six PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 57–60°. There are a spread of Ni–O bond distances ranging from 2.05–2.15 Å. There are four inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three NiO6 octahedra and edges with two equivalent NiO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There is one shorter (1.52 Å) and three longer (1.57 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three NiO6 octahedra and edges with two equivalent NiO6 octahedra. The corner-sharing octahedra tilt angles range from 53–54°. There are a spread of P–O bond distances ranging from 1.52–1.58 Å. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with five NiO6 octahedra and an edgeedge with one NiO6 octahedra. The corner-sharing octahedra tilt angles range from 36–60°. There are a spread of P–O bond distances ranging from 1.52–1.59 Å. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with five NiO6 octahedra and an edgeedge with one NiO6 octahedra. The corner-sharing octahedra tilt angles range from 39–62°. There are a spread of P–O bond distances ranging from 1.53–1.58 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Na1+, two equivalent Ni2+, and one P5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ni2+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ni2+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+, one Ni2+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Ni2+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ni2+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Ni2+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+, one Ni2+, and one P5+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two Ni2+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a 3-coordinate geometry to two Ni2+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Ni2+, and one P5+ atom. In the twelfth O2- site, O2- is bonded to one Na1+, two Ni2+, and one P5+ atom to form distorted corner-sharing ONaNi2P tetrahedra. In the thirteenth O2- site, O2- is bonded to one Na1+, two Ni2+, and one P5+ atom to form distorted corner-sharing ONaNi2P trigonal pyramids. In the fourteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Ni2+, and one P5+ atom.