Materials Data on Sr4Ti5(Si2O11)2 by Materials Project
Sr4Ti5(Si2O11)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Sr–O bond distances ranging from 2.57–3.09 Å. In the second Sr2+ site, Sr2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Sr–O bond distances ranging from 2.50–3.02 Å. There are three inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent SiO4 tetrahedra and edges with two equivalent TiO6 octahedra. There are a spread of Ti–O bond distances ranging from 1.89–2.00 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six SiO4 tetrahedra. There is two shorter (1.94 Å) and four longer (2.04 Å) Ti–O bond length. In the third Ti4+ site, Ti4+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ti–O bond distances ranging from 1.85–1.96 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 three TiO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 18–50°. There are a spread of Si–O bond distances ranging from 1.63–1.65 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 a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedral tilt angles are 39°. There are a spread of Si–O bond distances ranging from 1.59–1.68 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Sr2+ and one Si4+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Sr2+, one Ti4+, and one Si4+ atom. In the third O2- site, O2- is bonded in a distorted linear geometry to two equivalent Sr2+ and two Si4+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two Sr2+, one Ti4+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to two Sr2+, one Ti4+, and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two Sr2+ and two equivalent Ti4+ atoms. In the seventh O2- site, O2- is bonded in a distorted L-shaped geometry to two Sr2+ and two equivalent Ti4+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to three Ti4+ atoms.