DOI: 10.17188/1652546
title: Materials Data on CaAl4(SiO3)8 by Materials Project

description: Ca(Al(SiO3)2)4 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of one calcium molecule and one Al(SiO3)2 sheet oriented in the (0, 0, 1) direction. In the Al(SiO3)2 sheet, there are four inequivalent Al sites. In the first Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra and edges with three AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.87–1.96 Å. In the second Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra and edges with three AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.86–1.95 Å. In the third Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra and edges with three AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.86–1.96 Å. In the fourth Al site, Al is bonded to six O atoms to form AlO6 octahedra that share corners with four SiO4 tetrahedra and edges with three AlO6 octahedra. There are a spread of Al–O bond distances ranging from 1.87–1.96 Å. There are eight inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–57°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 52–56°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–56°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. In the fourth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–57°. There is one shorter (1.63 Å) and three longer (1.64 Å) Si–O bond length. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–57°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 52–56°. There are a spread of Si–O bond distances ranging from 1.63–1.65 Å. In the seventh Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 52–56°. There is two shorter (1.63 Å) and two longer (1.64 Å) Si–O bond length. In the eighth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two AlO6 octahedra and corners with three SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–57°. There is one shorter (1.63 Å) and three longer (1.64 Å) Si–O bond length. There are twenty-four inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the second O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the third O site, O is bonded in a trigonal planar geometry to two Al and one Si atom. In the fourth O site, O is bonded in a trigonal planar geometry to two Al and one Si atom. In the fifth O site, O is bonded in a trigonal planar geometry to two Al and one Si atom. In the sixth O site, O is bonded in a trigonal planar geometry to two Al and one Si atom. In the seventh O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the eighth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the ninth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the tenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the eleventh O site, O is bonded in a water-like geometry to two Al atoms. In the twelfth O site, O is bonded in a water-like geometry to two Al atoms. In the thirteenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the fourteenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the fifteenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the sixteenth O site, O is bonded in a bent 120 degrees geometry to two Si atoms. In the seventeenth O site, O is bonded in a water-like geometry to two Al atoms. In the eighteenth O site, O is bonded in a water-like geometry to two Al atoms. In the nineteenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the twentieth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the twenty-first O site, O is bonded in a trigonal planar geometry to two Al and one Si atom. In the twenty-second O site, O is bonded in a trigonal planar geometry to two Al and one Si atom. In the twenty-third O site, O is bonded in a trigonal planar geometry to two Al and one Si atom. In the twenty-fourth O site, O is bonded in a trigonal planar geometry to two Al and one Si atom.