DOI: 10.17188/1207818
title: Materials Data on NaSm3Ti2(SbO7)2 by Materials Project

description: NaSm3Ti2(SbO7)2 crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. Na1+ is bonded to eight O2- atoms to form distorted NaO8 hexagonal bipyramids that share edges with six SmO8 hexagonal bipyramids, edges with two equivalent TiO6 octahedra, and edges with four SbO6 octahedra. There are a spread of Na–O bond distances ranging from 2.31–2.72 Å. There are three inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded to eight O2- atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent NaO8 hexagonal bipyramids, edges with four SmO8 hexagonal bipyramids, edges with two equivalent SbO6 octahedra, and edges with four TiO6 octahedra. There are a spread of Sm–O bond distances ranging from 2.24–2.76 Å. In the second Sm3+ site, Sm3+ is bonded to eight O2- atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent NaO8 hexagonal bipyramids, edges with four SmO8 hexagonal bipyramids, edges with two equivalent TiO6 octahedra, and edges with four SbO6 octahedra. There are a spread of Sm–O bond distances ranging from 2.24–2.61 Å. In the third Sm3+ site, Sm3+ is bonded to eight O2- atoms to form distorted SmO8 hexagonal bipyramids that share edges with two equivalent NaO8 hexagonal bipyramids, edges with four SmO8 hexagonal bipyramids, edges with two equivalent SbO6 octahedra, and edges with four TiO6 octahedra. There are a spread of Sm–O bond distances ranging from 2.24–2.62 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four SbO6 octahedra, edges with two equivalent NaO8 hexagonal bipyramids, and edges with four SmO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 43–44°. There are a spread of Ti–O bond distances ranging from 1.94–2.02 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four SbO6 octahedra, and edges with six SmO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 43–47°. There are a spread of Ti–O bond distances ranging from 1.96–2.00 Å. There are two inequivalent Sb5+ sites. In the first Sb5+ site, Sb5+ is bonded to six O2- atoms to form SbO6 octahedra that share corners with two equivalent SbO6 octahedra, corners with four TiO6 octahedra, edges with two equivalent NaO8 hexagonal bipyramids, and edges with four SmO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 44–47°. There are a spread of Sb–O bond distances ranging from 1.99–2.03 Å. In the second Sb5+ site, Sb5+ is bonded to six O2- atoms to form SbO6 octahedra that share corners with two equivalent SbO6 octahedra, corners with four TiO6 octahedra, edges with two equivalent NaO8 hexagonal bipyramids, and edges with four SmO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 44–47°. There are a spread of Sb–O bond distances ranging from 1.99–2.02 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Sm3+, one Ti4+, and one Sb5+ atom. In the second O2- site, O2- is bonded to one Na1+ and three Sm3+ atoms to form corner-sharing ONaSm3 tetrahedra. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Sm3+, one Ti4+, and one Sb5+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Sm3+, and two Sb5+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to two Sm3+ and two Ti4+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two Sm3+, one Ti4+, and one Sb5+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to two Sm3+, one Ti4+, and one Sb5+ atom.