DOI: 10.17188/1752726
title: Materials Data on Ca5(SiO3)6 by Materials Project

description: Ca5(SiO3)6 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are five inequivalent Ca sites. In the first Ca site, Ca is bonded to seven O atoms to form distorted CaO7 pentagonal bipyramids that share corners with five SiO4 tetrahedra, edges with two equivalent CaO7 pentagonal bipyramids, and an edgeedge with one SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.31–2.66 Å. In the second Ca site, Ca is bonded to seven O atoms to form distorted CaO7 pentagonal bipyramids that share corners with five SiO4 tetrahedra, edges with two equivalent CaO7 pentagonal bipyramids, and an edgeedge with one SiO4 tetrahedra. There are a spread of Ca–O bond distances ranging from 2.31–2.68 Å. In the third Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.34–2.62 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 2.38–2.65 Å. In the fifth 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 2.38–2.67 Å. There are six inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one CaO7 pentagonal bipyramid and corners with two SiO4 tetrahedra. 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 a cornercorner with one CaO7 pentagonal bipyramid and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.68 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent CaO7 pentagonal bipyramids and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. In the fourth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent CaO7 pentagonal bipyramids and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. In the fifth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent CaO7 pentagonal bipyramids, corners with two SiO4 tetrahedra, and an edgeedge with one CaO7 pentagonal bipyramid. There are a spread of Si–O bond distances ranging from 1.60–1.68 Å. In the sixth Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent CaO7 pentagonal bipyramids, corners with two SiO4 tetrahedra, and an edgeedge with one CaO7 pentagonal bipyramid. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. There are eighteen inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to two Ca and one Si atom. In the second O site, O is bonded in a 3-coordinate geometry to two Ca and one Si atom. In the third O site, O is bonded in a 4-coordinate geometry to three Ca and one Si atom. In the fourth O site, O is bonded in a 4-coordinate geometry to three Ca and one Si atom. 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 4-coordinate geometry to three Ca and one Si atom. In the seventh O site, O is bonded in a 4-coordinate geometry to three Ca and one Si atom. In the eighth O site, O is bonded in a 4-coordinate geometry to three Ca and one Si atom. In the ninth O site, O is bonded in a distorted linear geometry to one Ca and one Si atom. In the tenth O site, O is bonded in a distorted linear geometry to one Ca and one Si atom. In the eleventh O site, O is bonded in a 2-coordinate geometry to one Ca and two Si atoms. In the twelfth O site, O is bonded in a distorted bent 120 degrees geometry to two Si atoms. In the thirteenth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fourteenth O site, O is bonded in a 2-coordinate geometry to one Ca and two Si atoms. In the fifteenth O site, O is bonded in a 3-coordinate geometry to one Ca and two Si atoms. In the sixteenth O site, O is bonded in a 3-coordinate geometry to one Ca and two Si atoms. In the seventeenth O site, O is bonded to three Ca and one Si atom to form distorted edge-sharing OCa3Si tetrahedra. In the eighteenth O site, O is bonded to three Ca and one Si atom to form distorted edge-sharing OCa3Si tetrahedra.