DOI: 10.17188/1748717
title: Materials Data on Ca4Ce2TiSi4(BO6)4 by Materials Project

description: Ca4Ce2TiSi4(BO6)4 is Esseneite-derived structured and crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first 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 2.34–2.72 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 2.33–2.85 Å. Ce4+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ce–O bond distances ranging from 2.18–2.72 Å. Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with four equivalent SiO4 tetrahedra. There are a spread of Ti–O bond distances ranging from 1.93–1.99 Å. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share a cornercorner with one BO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.42–1.53 Å. In the second B3+ site, B3+ is bonded to four O2- atoms to form BO4 tetrahedra that share a cornercorner with one BO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.40–1.56 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two BO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.68 Å. In the second Si4+ site, Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent TiO6 octahedra and corners with two BO4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. There are thirteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ce4+ and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Ca2+, one B3+, and one Si4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Ce4+, and one Si4+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ca2+, one Ce4+, one B3+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ca2+, one Ce4+, and one Ti4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to three Ca2+ and one B3+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ca2+, one Ce4+, and one B3+ atom. In the eighth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ca2+, one Ce4+, one B3+, and one Si4+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to two Ca2+, one B3+, and one Si4+ atom. In the tenth O2- site, O2- is bonded in a 3-coordinate geometry to one Ca2+, one Ti4+, and one Si4+ atom. In the eleventh O2- site, O2- is bonded in a 3-coordinate geometry to one Ce4+, one Ti4+, and one Si4+ atom. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and two equivalent B3+ atoms. In the thirteenth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ca2+ and two equivalent B3+ atoms.