DOI: 10.17188/1753409
title: Materials Data on Na2Mn(SiO3)2 by Materials Project

description: Na2Mn(SiO3)2 crystallizes in the orthorhombic Pmn2_1 space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–2.84 Å. In the second Na1+ site, Na1+ is bonded to eight O2- atoms to form distorted NaO8 hexagonal bipyramids that share corners with three NaO8 hexagonal bipyramids, a cornercorner with one SiO4 tetrahedra, an edgeedge with one NaO8 hexagonal bipyramid, edges with two MnO6 octahedra, edges with five SiO4 tetrahedra, and a faceface with one MnO6 octahedra. There are a spread of Na–O bond distances ranging from 2.32–2.81 Å. In the third Na1+ site, Na1+ is bonded in a distorted body-centered cubic geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.56–2.74 Å. In the fourth Na1+ site, Na1+ is bonded to eight O2- atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent NaO8 hexagonal bipyramids, corners with two SiO4 tetrahedra, edges with two equivalent NaO8 hexagonal bipyramids, edges with two equivalent MnO6 octahedra, edges with four SiO4 tetrahedra, and faces with two MnO6 octahedra. There are a spread of Na–O bond distances ranging from 2.20–2.79 Å. There are three inequivalent Mn2+ sites. In the first Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six SiO4 tetrahedra, edges with four NaO8 hexagonal bipyramids, and faces with two MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 2.18–2.23 Å. In the second Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six SiO4 tetrahedra, faces with three NaO8 hexagonal bipyramids, and a faceface with one MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 2.21–2.42 Å. In the third Mn2+ site, Mn2+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six SiO4 tetrahedra, edges with two equivalent NaO8 hexagonal bipyramids, a faceface with one NaO8 hexagonal bipyramid, and a faceface with one MnO6 octahedra. There are a spread of Mn–O bond distances ranging from 2.19–2.44 Å. There are four inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO8 hexagonal bipyramid, corners with three MnO6 octahedra, corners with two equivalent SiO4 tetrahedra, and edges with two equivalent NaO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 34–53°. There is two shorter (1.62 Å) and two longer (1.66 Å) Si–O bond length. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with three MnO6 octahedra, corners with two SiO4 tetrahedra, and edges with three NaO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 34–44°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO8 hexagonal bipyramid, corners with three MnO6 octahedra, corners with two SiO4 tetrahedra, and edges with two NaO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 33–44°. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. In the fourth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO8 hexagonal bipyramid, corners with three MnO6 octahedra, corners with two equivalent SiO4 tetrahedra, and edges with two equivalent NaO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 34–51°. There is two shorter (1.62 Å) and two longer (1.66 Å) Si–O bond length. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+, two Mn2+, and one Si4+ atom. In the second O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+, one Mn2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+, two Mn2+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+ and two Si4+ atoms. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two Na1+, two Mn2+, and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to two Na1+, two Mn2+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to three Na1+, one Mn2+, and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to three Na1+ and two Si4+ atoms. In the ninth O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+, one Mn2+, and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+ and two Si4+ atoms. In the eleventh O2- site, O2- is bonded in a 3-coordinate geometry to three Na1+, one Mn2+, and one Si4+ atom.