Materials Data on Ca5Si2HO9F by Materials Project
Ca5Si2HO9F crystallizes in the monoclinic P2_1 space group. The structure is three-dimensional. there are five inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to one H1+, six O2-, and one F1- atom. The Ca–H bond length is 2.55 Å. There are a spread of Ca–O bond distances ranging from 2.24–2.69 Å. The Ca–F bond length is 2.38 Å. In the second Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.23–2.78 Å. In the third Ca2+ site, Ca2+ is bonded in a 7-coordinate geometry to six O2- and one F1- atom. There are a spread of Ca–O bond distances ranging from 2.28–2.92 Å. The Ca–F bond length is 2.30 Å. In the fourth 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 2.10–2.72 Å. In the fifth Ca2+ site, Ca2+ is bonded in a 8-coordinate geometry to one H1+, six O2-, and one F1- atom. The Ca–H bond length is 2.32 Å. There are a spread of Ca–O bond distances ranging from 2.27–2.81 Å. The Ca–F bond length is 2.41 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are a spread of Si–O bond distances ranging from 1.66–1.81 Å. In the second Si4+ site, Si4+ is bonded in a trigonal bipyramidal geometry to one H1+ and four O2- atoms. The Si–H bond length is 1.54 Å. There are a spread of Si–O bond distances ranging from 1.67–1.84 Å. H1+ is bonded in a 1-coordinate geometry to two Ca2+ and one Si4+ atom. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to three Ca2+ and two Si4+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one O2- atom. The O–O bond length is 1.50 Å. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Ca2+ and two Si4+ atoms. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three Ca2+ and one O2- atom. The O–O bond length is 1.50 Å. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to four Ca2+ and one O2- atom. In the seventh O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Ca2+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 6-coordinate geometry to five Ca2+ and one O2- atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to four Ca2+ and one Si4+ atom. F1- is bonded in a distorted trigonal planar geometry to three Ca2+ atoms.