Materials Data on Ca4Si3O11 by Materials Project
Ca4Si3O11 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Ca sites. In the first Ca site, Ca is bonded to six O atoms to form distorted CaO6 octahedra that share corners with three SiO4 tetrahedra and edges with four CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.30–2.49 Å. In the second Ca site, Ca is bonded to six O atoms to form distorted CaO6 octahedra that share corners with five SiO4 tetrahedra and edges with four CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.30–2.53 Å. In the third Ca site, Ca is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.92 Å. In the fourth Ca site, Ca is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ca–O bond distances ranging from 2.37–2.87 Å. There are three inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with four CaO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 27–66°. There are a spread of Si–O bond distances ranging from 1.62–1.68 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two CaO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 49–64°. There are a spread of Si–O bond distances ranging from 1.62–1.67 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two CaO6 octahedra and corners with two SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 51–66°. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. There are eleven inequivalent O sites. In the first O site, O is bonded in a 3-coordinate geometry to one Ca and 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 distorted rectangular see-saw-like geometry to three Ca and one Si atom. In the fourth O site, O is bonded in a trigonal non-coplanar geometry to three Ca atoms. In the fifth O site, O is bonded in a 4-coordinate geometry to three Ca and one Si atom. In the sixth O site, O is bonded in a trigonal non-coplanar geometry to three Ca atoms. In the seventh O site, O is bonded to three Ca and one Si atom to form distorted corner-sharing OCa3Si tetrahedra. In the eighth O site, O is bonded to three Ca and one Si atom to form distorted corner-sharing OCa3Si tetrahedra. In the ninth O site, O is bonded in a 1-coordinate geometry to three Ca and one Si atom. In the tenth O site, O is bonded in a 1-coordinate geometry to three Ca and one Si atom. In the eleventh O site, O is bonded in a 3-coordinate geometry to one Ca and two Si atoms.