DOI: 10.17188/1301573
title: Materials Data on Ba6Ta9Ti7O42 by Materials Project

description: Ba6Ti7Ta9O42 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Ba–O bond distances ranging from 2.77–3.21 Å. In the second Ba2+ site, Ba2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ba–O bond distances ranging from 2.83–2.86 Å. In the third Ba2+ site, Ba2+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Ba–O bond distances ranging from 2.75–3.23 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Ba–O bond distances ranging from 2.79–3.22 Å. There are five inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share a cornercorner with one TiO6 octahedra, corners with four TaO6 octahedra, and edges with two equivalent TiO6 octahedra. The corner-sharing octahedra tilt angles range from 18–41°. There are a spread of Ti–O bond distances ranging from 1.90–2.13 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form distorted TiO6 octahedra that share corners with two equivalent TaO6 octahedra, corners with three TiO6 octahedra, and edges with two equivalent TaO6 octahedra. The corner-sharing octahedra tilt angles range from 18–44°. There are a spread of Ti–O bond distances ranging from 1.82–2.17 Å. In the third Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with three TaO6 octahedra, and edges with two equivalent TaO6 octahedra. The corner-sharing octahedra tilt angles range from 20–44°. There are a spread of Ti–O bond distances ranging from 1.87–2.09 Å. In the fourth Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two TiO6 octahedra, corners with three TaO6 octahedra, and edges with two TaO6 octahedra. The corner-sharing octahedra tilt angles range from 19–44°. There are a spread of Ti–O bond distances ranging from 1.86–2.09 Å. In the fifth Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two TiO6 octahedra, corners with three TaO6 octahedra, an edgeedge with one TiO6 octahedra, and an edgeedge with one TaO6 octahedra. The corner-sharing octahedra tilt angles range from 19–44°. There are a spread of Ti–O bond distances ranging from 1.90–2.13 Å. There are five inequivalent Ta+4.89+ sites. In the first Ta+4.89+ site, Ta+4.89+ is bonded to six O2- atoms to form TaO6 octahedra that share a cornercorner with one TiO6 octahedra, corners with four TaO6 octahedra, and edges with two equivalent TiO6 octahedra. The corner-sharing octahedra tilt angles range from 20–42°. There are a spread of Ta–O bond distances ranging from 1.93–2.09 Å. In the second Ta+4.89+ site, Ta+4.89+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with two equivalent TaO6 octahedra and corners with four TiO6 octahedra. The corner-sharing octahedra tilt angles range from 37–43°. There are a spread of Ta–O bond distances ranging from 1.97–2.04 Å. In the third Ta+4.89+ site, Ta+4.89+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with three TiO6 octahedra and corners with three TaO6 octahedra. The corner-sharing octahedra tilt angles range from 36–42°. There are a spread of Ta–O bond distances ranging from 1.96–2.04 Å. In the fourth Ta+4.89+ site, Ta+4.89+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with two TiO6 octahedra, corners with three TaO6 octahedra, and edges with two TiO6 octahedra. The corner-sharing octahedra tilt angles range from 19–43°. There are a spread of Ta–O bond distances ranging from 1.94–2.09 Å. In the fifth Ta+4.89+ site, Ta+4.89+ is bonded to six O2- atoms to form TaO6 octahedra that share a cornercorner with one TiO6 octahedra, corners with four TaO6 octahedra, and edges with two TiO6 octahedra. The corner-sharing octahedra tilt angles range from 19–42°. There are a spread of Ta–O bond distances ranging from 1.92–2.09 Å. There are twenty-four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+ and three Ti4+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, one Ti4+, and two equivalent Ta+4.89+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ba2+ and two Ti4+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, one Ti4+, and one Ta+4.89+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Ba2+, one Ti4+, and one Ta+4.89+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ba2+, one Ti4+, and one Ta+4.89+ atom. In the seventh O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, two equivalent Ti4+, and one Ta+4.89+ atom. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, one Ti4+, and two equivalent Ta+4.89+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, one Ti4+, and one Ta+4.89+ atom. In the tenth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+ and two Ta+4.89+ atoms. In the eleventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Ba2+, one Ti4+, and one Ta+4.89+ atom. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+ and two Ta+4.89+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ba2+, one Ti4+, and one Ta+4.89+ atom. In the fourteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Ba2+ and two Ta+4.89+ atoms. In the fifteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ba2+, one Ti4+, and one Ta+4.89+ atom. In the sixteenth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+ and two Ta+4.89+ atoms. In the seventeenth O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, two Ti4+, and one Ta+4.89+ atom. In the eighteenth O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, one Ti4+, and two Ta+4.89+ atoms. In the nineteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Ba2+, one Ti4+, and one Ta+4.89+ atom. In the twentieth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ba2+, one Ti4+, and one Ta+4.89+ atom. In the twenty-first O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+ and two Ta+4.89+ atoms. In the twenty-second O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, two Ti4+, and one Ta+4.89+ atom. In the twenty-third O2- site, O2- is bonded in a 4-coordinate geometry to one Ba2+, two Ti4+, and one Ta+4.89+ atom. In the twenty-fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two Ba2+, one Ti4+, and one Ta+4.89+ atom.