Materials Data on BaSrSi4(NO)4 by Materials Project
BaSrSi4(NO)4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ba–N bond length is 3.15 Å. There are a spread of Ba–O bond distances ranging from 2.55–3.26 Å. In the second Ba2+ site, Ba2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Ba–N bond length is 2.96 Å. There are a spread of Ba–O bond distances ranging from 2.56–2.94 Å. There are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 7-coordinate geometry to one N3- and six O2- atoms. The Sr–N bond length is 2.98 Å. There are a spread of Sr–O bond distances ranging from 2.45–2.85 Å. In the second Sr2+ site, Sr2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Sr–O bond distances ranging from 2.42–2.65 Å. There are eight 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 (1.75 Å) and two longer (1.77 Å) Si–N bond length. The Si–O bond length is 1.61 Å. In the second 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 1.65 Å. In the third 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 (1.77 Å) Si–N bond length. The Si–O bond length is 1.65 Å. In the fourth Si4+ site, Si4+ is bonded to three N3- and one O2- atom to form corner-sharing SiN3O tetrahedra. All Si–N bond lengths are 1.77 Å. The Si–O bond length is 1.61 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 1.75–1.77 Å. The Si–O bond length is 1.61 Å. In the sixth 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 1.65 Å. In the seventh 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 1.75–1.78 Å. The Si–O bond length is 1.61 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 1.74–1.77 Å. The Si–O bond length is 1.65 Å. There are eight 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 Sr2+ 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 trigonal planar geometry to one Ba2+ and three Si4+ atoms. In the sixth N3- site, N3- is bonded in a distorted trigonal planar geometry to one Ba2+ and three Si4+ atoms. In the seventh N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. In the eighth N3- site, N3- is bonded in a trigonal planar geometry to three Si4+ atoms. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Ba2+, two Sr2+, and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Ba2+, one Sr2+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to one Ba2+, one Sr2+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+, two Sr2+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two Ba2+, one Sr2+, and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to one Ba2+, one Sr2+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to one Ba2+, one Sr2+, and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to two Ba2+, two Sr2+, and one Si4+ atom.