DOI: 10.17188/1269595
title: Materials Data on CaSi2(NO)2 by Materials Project

description: CaSi2O2N2 crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are six inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ca–N bond length is 2.60 Å. There are a spread of Ca–O bond distances ranging from 2.33–2.64 Å. In the second Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ca–N bond length is 2.80 Å. There are a spread of Ca–O bond distances ranging from 2.31–2.97 Å. In the third Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ca–N bond length is 2.74 Å. There are a spread of Ca–O bond distances ranging from 2.37–2.82 Å. In the fourth Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ca–N bond length is 2.79 Å. There are a spread of Ca–O bond distances ranging from 2.36–2.71 Å. In the fifth Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ca–N bond length is 2.81 Å. There are a spread of Ca–O bond distances ranging from 2.32–3.06 Å. In the sixth Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ca–N bond length is 2.60 Å. There are a spread of Ca–O bond distances ranging from 2.34–2.71 Å. There are twelve inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is one shorter (1.74 Å) and two longer (1.75 Å) Si–N bond length. The Si–O bond length is 1.62 Å. In the second Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is one shorter (1.74 Å) and two longer (1.75 Å) Si–N bond length. The Si–O bond length is 1.63 Å. In the third Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.72–1.76 Å. The Si–O bond length is 1.64 Å. In the fourth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.75–1.77 Å. The Si–O bond length is 1.63 Å. In the fifth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.72–1.76 Å. The Si–O bond length is 1.63 Å. In the sixth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is one shorter (1.74 Å) and two longer (1.75 Å) Si–N bond length. The Si–O bond length is 1.63 Å. In the seventh Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is one shorter (1.74 Å) and two longer (1.75 Å) Si–N bond length. The Si–O bond length is 1.62 Å. In the eighth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.74–1.78 Å. The Si–O bond length is 1.63 Å. In the ninth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is one shorter (1.74 Å) and two longer (1.75 Å) Si–N bond length. The Si–O bond length is 1.63 Å. In the tenth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is two shorter (1.76 Å) and one longer (1.77 Å) Si–N bond length. The Si–O bond length is 1.63 Å. In the eleventh Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There is one shorter (1.73 Å) and two longer (1.76 Å) Si–N bond length. The Si–O bond length is 1.62 Å. In the twelfth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. There are a spread of Si–N bond distances ranging from 1.73–1.77 Å. The Si–O bond length is 1.62 Å. There are twelve inequivalent N3- sites. In the first N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the second N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the third N3- site, N3- is bonded in a distorted trigonal planar geometry to one Ca2+ and three Si4+ atoms. In the fourth N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the fifth N3- site, N3- is bonded in a distorted trigonal planar geometry to one Ca2+ and three Si4+ atoms. In the sixth N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the seventh N3- site, N3- is bonded in a 4-coordinate geometry to one Ca2+ and three Si4+ atoms. In the eighth N3- site, N3- is bonded in a 4-coordinate geometry to one Ca2+ and three Si4+ atoms. In the ninth N3- site, N3- is bonded in a distorted trigonal planar geometry to one Ca2+ and three Si4+ atoms. In the tenth N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the eleventh N3- site, N3- is bonded in a distorted trigonal planar geometry to one Ca2+ and three Si4+ atoms. In the twelfth N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to three Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to three Ca2+ and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one Si4+ atom. In the eleventh O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom. In the twelfth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one Si4+ atom.