DOI: 10.17188/1291042
title: Materials Data on Th4Ta18O53 by Materials Project

description: Th4Ta18O53 crystallizes in the trigonal P3 space group. The structure is three-dimensional. there are four inequivalent Th4+ sites. In the first Th4+ site, Th4+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Th–O bond distances ranging from 2.26–2.67 Å. In the second Th4+ site, Th4+ is bonded to six O2- atoms to form distorted edge-sharing ThO6 octahedra. There are three shorter (2.29 Å) and three longer (2.34 Å) Th–O bond lengths. In the third Th4+ site, Th4+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.24 Å) and three longer (2.47 Å) Th–O bond lengths. In the fourth Th4+ site, Th4+ is bonded to six O2- atoms to form distorted edge-sharing ThO6 octahedra. There are three shorter (2.29 Å) and three longer (2.34 Å) Th–O bond lengths. There are six inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded to five O2- atoms to form distorted corner-sharing TaO5 trigonal bipyramids. There are a spread of Ta–O bond distances ranging from 1.84–2.01 Å. In the second Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.95–2.09 Å. In the third Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.90–2.11 Å. In the fourth Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.94–2.08 Å. In the fifth Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.90–2.10 Å. In the sixth Ta5+ site, Ta5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ta–O bond distances ranging from 1.85–2.13 Å. There are twenty-five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ta5+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ta5+ atoms. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ta5+ atoms. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two Ta5+ atoms. In the fifth O2- site, O2- is bonded in a linear geometry to two Ta5+ atoms. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two Th4+ and one Ta5+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Th4+ and one Ta5+ atom. In the eighth O2- site, O2- is bonded in a trigonal planar geometry to two Th4+ and one Ta5+ atom. In the ninth O2- site, O2- is bonded in a trigonal non-coplanar geometry to two Th4+ and one Ta5+ atom. In the tenth O2- site, O2- is bonded in a linear geometry to two Ta5+ atoms. In the eleventh O2- site, O2- is bonded in a linear geometry to two Ta5+ atoms. In the twelfth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ta5+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ta5+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ta5+ atoms. In the fifteenth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the sixteenth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the seventeenth O2- site, O2- is bonded in a 3-coordinate geometry to one Th4+ and three equivalent Ta5+ atoms. In the eighteenth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the nineteenth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the twentieth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the twenty-first O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the twenty-second O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the twenty-third O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the twenty-fourth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms. In the twenty-fifth O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Ta5+ atoms.