Materials Data on Nb2Pb3O8 by Materials Project
Pb3Nb2O8 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two PbO6 octahedra and corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 29–51°. There are a spread of Nb–O bond distances ranging from 1.92–2.11 Å. In the second Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two PbO6 octahedra and corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 30–53°. There are a spread of Nb–O bond distances ranging from 1.91–2.14 Å. In the third Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two PbO6 octahedra and corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 30–52°. There are a spread of Nb–O bond distances ranging from 1.93–2.11 Å. In the fourth Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two equivalent PbO6 octahedra and corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 34–50°. There are a spread of Nb–O bond distances ranging from 1.98–2.07 Å. In the fifth Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two equivalent PbO6 octahedra and corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 31–50°. There are a spread of Nb–O bond distances ranging from 1.99–2.03 Å. In the sixth Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with two PbO6 octahedra and corners with four NbO6 octahedra. The corner-sharing octahedra tilt angles range from 29–53°. There are a spread of Nb–O bond distances ranging from 1.91–2.13 Å. There are nine inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.43–3.10 Å. In the second Pb2+ site, Pb2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.52–3.01 Å. In the third Pb2+ site, Pb2+ is bonded to six O2- atoms to form PbO6 octahedra that share corners with six NbO6 octahedra. The corner-sharing octahedra tilt angles range from 47–52°. There are a spread of Pb–O bond distances ranging from 2.18–2.20 Å. In the fourth Pb2+ site, Pb2+ is bonded to six O2- atoms to form PbO6 octahedra that share corners with six NbO6 octahedra. The corner-sharing octahedra tilt angles range from 49–53°. There are four shorter (2.20 Å) and two longer (2.21 Å) Pb–O bond lengths. In the fifth Pb2+ site, Pb2+ is bonded in a hexagonal planar geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.60–2.80 Å. In the sixth Pb2+ site, Pb2+ is bonded in a hexagonal planar geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.58–2.92 Å. In the seventh Pb2+ site, Pb2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.53–3.02 Å. In the eighth Pb2+ site, Pb2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.45–3.05 Å. In the ninth Pb2+ site, Pb2+ is bonded in a hexagonal planar geometry to six O2- atoms. There are a spread of Pb–O bond distances ranging from 2.72–2.80 Å. There are twenty-four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two Nb5+ and two Pb2+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to two Nb5+ and two Pb2+ atoms. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the twelfth O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the thirteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Nb5+ and two Pb2+ atoms. In the fifteenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Nb5+ and one Pb2+ atom. In the sixteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Nb5+ and two Pb2+ atoms. In the seventeenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Nb5+ and one Pb2+ atom. In the eighteenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Nb5+ and one Pb2+ atom. In the nineteenth O2- site, O2- is bonded in a bent 150 degrees geometry to two Nb5+ and one Pb2+ atom. In the twentieth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Nb5+ and one Pb2+ atom. In the twenty-first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Nb5+ and two Pb2+ atoms. In the twenty-second O2- site, O2- is bonded in a bent 150 degrees geometry to two Nb5+ and one Pb2+ atom. In the twenty-third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Nb5+ and two Pb2+ atoms. In the twenty-fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Nb5+ and three Pb2+ atoms.