DOI: 10.17188/1722520
title: Materials Data on Na5Ca7Zr2Ti2Si8(O5F)6 by Materials Project

description: Na5Ca7Zr2Ti2Si8(O5F)6 is Esseneite-derived structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 8-coordinate geometry to seven O2- and one F1- atom. There are a spread of Na–O bond distances ranging from 2.37–2.83 Å. The Na–F bond length is 2.34 Å. In the second Na1+ site, Na1+ is bonded to three O2- and three F1- atoms to form distorted NaO3F3 octahedra that share a cornercorner with one ZrO6 octahedra, corners with two CaO5F octahedra, corners with two SiO4 tetrahedra, an edgeedge with one NaO6F2 hexagonal bipyramid, an edgeedge with one CaO6F2 hexagonal bipyramid, edges with two equivalent CaO3F3 octahedra, and edges with two TiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 65–69°. There are a spread of Na–O bond distances ranging from 2.36–2.61 Å. There are a spread of Na–F bond distances ranging from 2.34–2.44 Å. In the third Na1+ site, Na1+ is bonded to six O2- and two equivalent F1- atoms to form distorted NaO6F2 hexagonal bipyramids that share corners with two equivalent CaO5F octahedra, edges with two equivalent NaO3F3 octahedra, edges with two equivalent CaO3F3 octahedra, edges with two equivalent TiO4F2 octahedra, and edges with four SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 61°. There are a spread of Na–O bond distances ranging from 2.57–2.68 Å. Both Na–F bond lengths are 2.25 Å. There are four inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to five O2- and one F1- atom to form distorted CaO5F octahedra that share a cornercorner with one NaO6F2 hexagonal bipyramid, a cornercorner with one NaO3F3 octahedra, a cornercorner with one CaO3F3 octahedra, corners with five SiO4 tetrahedra, an edgeedge with one ZrO6 octahedra, and edges with two equivalent CaO5F octahedra. The corner-sharing octahedra tilt angles range from 55–65°. There are a spread of Ca–O bond distances ranging from 2.34–2.59 Å. The Ca–F bond length is 2.29 Å. In the second Ca2+ site, Ca2+ is bonded to three O2- and three F1- atoms to form distorted CaO3F3 octahedra that share a cornercorner with one ZrO6 octahedra, corners with two CaO5F octahedra, corners with two SiO4 tetrahedra, an edgeedge with one NaO6F2 hexagonal bipyramid, an edgeedge with one CaO6F2 hexagonal bipyramid, edges with two equivalent NaO3F3 octahedra, and edges with two TiO4F2 octahedra. The corner-sharing octahedra tilt angles range from 55–68°. There are a spread of Ca–O bond distances ranging from 2.37–2.41 Å. There are a spread of Ca–F bond distances ranging from 2.26–2.33 Å. In the third Ca2+ site, Ca2+ is bonded to five O2- and one F1- atom to form CaO5F octahedra that share a cornercorner with one NaO3F3 octahedra, a cornercorner with one CaO3F3 octahedra, a cornercorner with one TiO4F2 octahedra, corners with five SiO4 tetrahedra, an edgeedge with one ZrO6 octahedra, and edges with two equivalent CaO5F octahedra. The corner-sharing octahedra tilt angles range from 55–67°. There are a spread of Ca–O bond distances ranging from 2.30–2.49 Å. The Ca–F bond length is 2.40 Å. In the fourth Ca2+ site, Ca2+ is bonded to six O2- and two equivalent F1- atoms to form distorted CaO6F2 hexagonal bipyramids that share edges with two equivalent NaO3F3 octahedra, edges with two equivalent CaO3F3 octahedra, edges with two equivalent TiO6 octahedra, and edges with four SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.46–2.61 Å. Both Ca–F bond lengths are 2.22 Å. Zr+3.50+ is bonded to six O2- atoms to form ZrO6 octahedra that share a cornercorner with one NaO3F3 octahedra, a cornercorner with one CaO3F3 octahedra, a cornercorner with one TiO6 octahedra, corners with five SiO4 tetrahedra, and edges with two CaO5F octahedra. The corner-sharing octahedra tilt angles range from 44–69°. There are a spread of Zr–O bond distances ranging from 2.05–2.28 Å. There are two inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to four O2- and two equivalent F1- atoms to form TiO4F2 octahedra that share corners with two equivalent CaO5F octahedra, corners with four SiO4 tetrahedra, edges with two equivalent NaO6F2 hexagonal bipyramids, edges with two equivalent NaO3F3 octahedra, and edges with two equivalent CaO3F3 octahedra. The corner-sharing octahedral tilt angles are 55°. There is two shorter (1.95 Å) and two longer (2.04 Å) Ti–O bond length. Both Ti–F bond lengths are 2.07 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent ZrO6 octahedra, corners with four SiO4 tetrahedra, edges with two equivalent CaO6F2 hexagonal bipyramids, edges with two equivalent NaO3F3 octahedra, and edges with two equivalent CaO3F3 octahedra. The corner-sharing octahedral tilt angles are 44°. There are a spread of Ti–O bond distances ranging from 1.98–2.02 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 TiO4F2 octahedra, corners with two equivalent ZrO6 octahedra, corners with three CaO5F octahedra, a cornercorner with one SiO4 tetrahedra, and an edgeedge with one NaO6F2 hexagonal bipyramid. The corner-sharing octahedra tilt angles range from 31–77°. There is three shorter (1.64 Å) and one longer (1.65 Å) Si–O bond length. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO3F3 octahedra, a cornercorner with one ZrO6 octahedra, a cornercorner with one TiO6 octahedra, corners with three CaO5F octahedra, a cornercorner with one SiO4 tetrahedra, and an edgeedge with one CaO6F2 hexagonal bipyramid. The corner-sharing octahedra tilt angles range from 41–72°. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. In the third Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one ZrO6 octahedra, a cornercorner with one TiO6 octahedra, corners with four CaO5F octahedra, a cornercorner with one SiO4 tetrahedra, and an edgeedge with one CaO6F2 hexagonal bipyramid. The corner-sharing octahedra tilt angles range from 41–68°. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the fourth Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share a cornercorner with one NaO3F3 octahedra, a cornercorner with one ZrO6 octahedra, a cornercorner with one TiO4F2 octahedra, corners with two CaO5F octahedra, a cornercorner with one SiO4 tetrahedra, and an edgeedge with one NaO6F2 hexagonal bipyramid. The corner-sharing octahedra tilt angles range from 33–74°. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. There are fifteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+ and two Si4+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+, one Zr+3.50+, and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ca2+, one Zr+3.50+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ca2+, one Ti4+, and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two Ca2+, one Ti4+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Zr+3.50+, and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Zr+3.50+, and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ca2+, one Zr+3.50+, and one Si4+ atom. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to two Na1+, one Ti4+, and one Si4+ atom. In the twelfth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Na1+, one Ca2+, one Zr+3.50+, and one Ti4+ atom. In the thirteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Ca2+, and one Si4+ atom. In the fourteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Ca2+, one Ti4+, and one Si4+ atom. In the fifteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Na1+, one Ca2+, and two Si4+ atoms. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted rectangular see-saw-like geometry to two Na1+ and two Ca2+ atoms. In the second F1- site, F1- is bonded to one Na1+, two Ca2+, and one Ti4+ atom to form distorted corner-sharing FNaCa2Ti tetrahedra. In the third F1- site, F1- is bonded to two Na1+ and two Ca2+ atoms to form corner-sharing FNa2Ca2 tetrahedra.