Materials Data on CaMn8O16 by Materials Project
CaMn8O16 crystallizes in the monoclinic Pc space group. The structure is three-dimensional. Ca2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ca–O bond distances ranging from 2.39–2.69 Å. There are eight inequivalent Mn+3.75+ sites. In the first Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 49–52°. There are a spread of Mn–O bond distances ranging from 1.89–2.08 Å. In the second Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 50–51°. There are a spread of Mn–O bond distances ranging from 1.91–2.00 Å. In the third Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 50–51°. There are a spread of Mn–O bond distances ranging from 1.90–1.99 Å. In the fourth Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 49–52°. There are a spread of Mn–O bond distances ranging from 1.90–2.00 Å. In the fifth Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 50–52°. There are a spread of Mn–O bond distances ranging from 1.90–1.97 Å. In the sixth Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 50–52°. There are a spread of Mn–O bond distances ranging from 1.90–2.12 Å. In the seventh Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 51–52°. There are a spread of Mn–O bond distances ranging from 1.92–1.96 Å. In the eighth Mn+3.75+ site, Mn+3.75+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedra tilt angles range from 50–52°. There are a spread of Mn–O bond distances ranging from 1.91–1.97 Å. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+ and three Mn+3.75+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to three Mn+3.75+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn+3.75+ atoms. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to three Mn+3.75+ atoms. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn+3.75+ atoms. In the sixth O2- site, O2- is bonded in a trigonal planar geometry to three Mn+3.75+ atoms. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn+3.75+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Mn+3.75+ atoms. In the ninth O2- site, O2- is bonded to one Ca2+ and three Mn+3.75+ atoms to form a mixture of distorted corner and edge-sharing OCaMn3 trigonal pyramids. In the tenth O2- site, O2- is bonded to one Ca2+ and three Mn+3.75+ atoms to form a mixture of distorted corner and edge-sharing OCaMn3 trigonal pyramids. In the eleventh O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Mn+3.75+ atoms. In the twelfth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Mn+3.75+ atoms. In the thirteenth O2- site, O2- is bonded in a 3-coordinate geometry to three Mn+3.75+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Mn+3.75+ atoms. In the fifteenth O2- site, O2- is bonded to one Ca2+ and three Mn+3.75+ atoms to form a mixture of distorted corner and edge-sharing OCaMn3 trigonal pyramids. In the sixteenth O2- site, O2- is bonded to one Ca2+ and three Mn+3.75+ atoms to form a mixture of distorted corner and edge-sharing OCaMn3 trigonal pyramids.