DOE OSTI2020
SnO2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are twelve inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.10–2.15 Å. In the second Sn4+ site, Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.10–2.15 Å. In the third Sn4+ site, Sn4+ is bonded to four O2- atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 55–61°. There are a spread of Sn–O bond distances ranging from 1.96–2.03 Å. In the fourth Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with three SnO4 tetrahedra and edges with four SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.01–2.18 Å. In the fifth Sn4+ site, Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.10–2.15 Å. In the sixth Sn4+ site, Sn4+ is bonded to four O2- atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 54–62°. There are a spread of Sn–O bond distances ranging from 1.95–2.03 Å. In the seventh Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with six SnO4 tetrahedra and edges with two equivalent SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.03–2.16 Å. In the eighth Sn4+ site, Sn4+ is bonded to four O2- atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 53–61°. There are a spread of Sn–O bond distances ranging from 1.95–2.03 Å. In the ninth Sn4+ site, Sn4+ is bonded to six O2- atoms to form SnO6 octahedra that share corners with three SnO4 tetrahedra and edges with four SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.01–2.17 Å. In the tenth Sn4+ site, Sn4+ is bonded to four O2- atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedra tilt angles range from 55–62°. There is two shorter (1.96 Å) and two longer (2.02 Å) Sn–O bond length. In the eleventh Sn4+ site, Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.10–2.15 Å. In the twelfth Sn4+ site, Sn4+ is bonded to six O2- atoms to form edge-sharing SnO6 octahedra. There are a spread of Sn–O bond distances ranging from 2.10–2.14 Å. There are twenty-four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the sixth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the ninth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the tenth O2- site, O2- is bonded in a bent 120 degrees geometry to two Sn4+ atoms. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms. In the twelfth O2- site, O2- is bonded in a bent 120 degrees geometry to two Sn4+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the fifteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms. In the sixteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms. In the seventeenth O2- site, O2- is bonded in a bent 120 degrees geometry to two Sn4+ atoms. In the eighteenth O2- site, O2- is bonded in a bent 120 degrees geometry to two Sn4+ atoms. In the nineteenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the twentieth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms. In the twenty-first O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms. In the twenty-second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the twenty-third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Sn4+ atoms. In the twenty-fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Sn4+ atoms.