Materials Data on Ca(SbO2)2 by Materials Project

Abstract

CaSb2O4 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are eight inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.58 Å. In the second Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share a cornercorner with one CaO4 tetrahedra, a cornercorner with one SbO4 tetrahedra, and an edgeedge with one SbO5 square pyramid. There are a spread of Ca–O bond distances ranging from 2.41–2.95 Å. In the third Ca2+ site, Ca2+ is bonded to four O2- atoms to form CaO4 tetrahedra that share corners with three CaO6 octahedra and corners with three equivalent SbO5 square pyramids. The corner-sharing octahedra tilt angles range from 63–68°. There are a spread of Ca–O bond distances ranging from 2.33–2.45 Å. In the fourth Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share a cornercorner with one SbO4 tetrahedra, corners with two equivalent CaO4 tetrahedra, an edgeedge with one CaO6 octahedra, and an edgeedge with one SbO5 square pyramid. There are a spread of Ca–O bond distances ranging from 2.28–2.70 Å. In the fifth Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with two equivalent SbO4 tetrahedra, edges with two CaO6 octahedra, and edges with four equivalent SbO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.32–2.79 Å. In the sixth Ca2+ site, Ca2+ is bonded to six O2- atoms to form distorted CaO6 octahedra that share corners with three equivalent SbO4 tetrahedra, edges with two CaO6 octahedra, and edges with two equivalent SbO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.21–2.55 Å. In the seventh Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share corners with two equivalent SbO4 tetrahedra and an edgeedge with one CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.32–2.55 Å. In the eighth Ca2+ site, Ca2+ is bonded to six O2- atoms to form CaO6 octahedra that share edges with two CaO6 octahedra and edges with two equivalent SbO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.28–2.45 Å. There are twelve inequivalent Sb3+ sites. In the first Sb3+ site, Sb3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sb–O bond distances ranging from 2.06–2.77 Å. In the second Sb3+ site, Sb3+ is bonded to five O2- atoms to form SbO5 square pyramids that share corners with three equivalent CaO4 tetrahedra and edges with two CaO6 octahedra. There are a spread of Sb–O bond distances ranging from 2.00–2.38 Å. In the third Sb3+ site, Sb3+ is bonded to four O2- atoms to form distorted SbO4 tetrahedra that share corners with four equivalent SbO6 octahedra and corners with six CaO6 octahedra. The corner-sharing octahedra tilt angles range from 29–72°. There are a spread of Sb–O bond distances ranging from 1.98–2.39 Å. In the fourth Sb3+ site, Sb3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sb–O bond distances ranging from 2.09–2.84 Å. In the fifth Sb3+ site, Sb3+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are one shorter (1.98 Å) and two longer (2.03 Å) Sb–O bond lengths. In the sixth Sb3+ site, Sb3+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are one shorter (2.01 Å) and two longer (2.06 Å) Sb–O bond lengths. In the seventh Sb3+ site, Sb3+ is bonded to six O2- atoms to form distorted SbO6 octahedra that share corners with two equivalent SbO4 tetrahedra, edges with two equivalent SbO6 octahedra, and edges with four CaO6 octahedra. There are a spread of Sb–O bond distances ranging from 2.05–2.65 Å. In the eighth Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to four O2- atoms. There are a spread of Sb–O bond distances ranging from 2.01–2.81 Å. In the ninth Sb3+ site, Sb3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sb–O bond distances ranging from 2.04–2.78 Å. In the tenth Sb3+ site, Sb3+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are two shorter (2.02 Å) and one longer (2.05 Å) Sb–O bond lengths. In the eleventh Sb3+ site, Sb3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sb–O bond distances ranging from 1.95–2.71 Å. In the twelfth Sb3+ site, Sb3+ is bonded to four O2- atoms to form distorted SbO4 tetrahedra that share corners with three CaO6 octahedra. The corner-sharing octahedra tilt angles range from 55–68°. There are a spread of Sb–O bond distances ranging from 2.03–2.51 Å. There are twenty-four inequivalent O2- sites. In the first O2- site, O2- is bonded to two Ca2+ and two Sb3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Sb2 tetrahedra. In the second O2- site, O2- is bonded to two Ca2+ and two equivalent Sb3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Sb2 tetrahedra. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Sb3+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Sb3+ atoms. In the fifth O2- site, O2- is bonded to two Ca2+ and two Sb3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Sb2 tetrahedra. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Sb3+ atoms. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ca2+ and three Sb3+ atoms. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to one Ca2+ and three Sb3+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and three Sb3+ atoms. In the tenth O2- site, O2- is bonded to two Ca2+ and two Sb3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Sb2 tetrahedra. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to one Ca2+ and three Sb3+ atoms. In the twelfth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Ca2+ and two Sb3+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Sb3+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ca2+ and two equivalent Sb3+ atoms. In the fifteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Ca2+ and three Sb3+ atoms. In the sixteenth O2- site, O2- is bonded in a trigonal non-coplanar geometry to one Ca2+ and two equivalent Sb3+ atoms. In the seventeenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Ca2+ and two Sb3+ atoms. In the eighteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Ca2+ and two Sb3+ atoms. In the nineteenth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Ca2+ and two equivalent Sb3+ atoms. In the twentieth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Sb3+ atoms. In the twenty-first O2- site, O2- is bonded in a trigonal non-coplanar geometry to one Ca2+ and two equivalent Sb3+ atoms. In the twenty-second O2- site, O2- is bonded in a 1-coordinate geometry to four Sb3+ atoms. In the twenty-third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Sb3+ atoms. In the twenty-fourth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Sb3+ atoms.