Materials Data on La7Ta3(W2O15)2 by Materials Project
La7Ta3W4O30 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.40–2.94 Å. In the second La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.44–3.01 Å. In the third La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.42–2.90 Å. In the fourth La3+ site, La3+ is bonded to twelve O2- atoms to form LaO12 cuboctahedra that share faces with four TaO6 octahedra and faces with four WO6 octahedra. There are a spread of La–O bond distances ranging from 2.56–2.76 Å. There are two inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with two equivalent TaO6 octahedra, corners with four WO6 octahedra, and faces with two equivalent LaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 35–36°. There are two shorter (2.00 Å) and four longer (2.03 Å) Ta–O bond lengths. In the second Ta5+ site, Ta5+ is bonded to six O2- atoms to form distorted TaO6 octahedra that share a cornercorner with one TaO6 octahedra, corners with two WO6 octahedra, and a faceface with one LaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 30–36°. There are a spread of Ta–O bond distances ranging from 1.88–2.29 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded to six O2- atoms to form distorted WO6 octahedra that share a cornercorner with one WO6 octahedra, corners with two TaO6 octahedra, and a faceface with one LaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 29–35°. There are a spread of W–O bond distances ranging from 1.85–2.19 Å. In the second W6+ site, W6+ is bonded to six O2- atoms to form distorted WO6 octahedra that share a cornercorner with one WO6 octahedra, corners with two TaO6 octahedra, and a faceface with one LaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 29–35°. There are a spread of W–O bond distances ranging from 1.85–2.18 Å. There are fifteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two La3+, one Ta5+, and one W6+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two La3+ and two W6+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two La3+, one Ta5+, and one W6+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two La3+ and one Ta5+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two La3+ and one W6+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two La3+ and one W6+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to two La3+ and one Ta5+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to two La3+ and one W6+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two La3+ and one W6+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one Ta5+ atom. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one W6+ atom. In the twelfth O2- site, O2- is bonded in a 1-coordinate geometry to three La3+ and one W6+ atom. In the thirteenth O2- site, O2- is bonded in a 4-coordinate geometry to two La3+, one Ta5+, and one W6+ atom. In the fourteenth O2- site, O2- is bonded in a 4-coordinate geometry to two La3+ and two Ta5+ atoms. In the fifteenth O2- site, O2- is bonded in a 4-coordinate geometry to two La3+, one Ta5+, and one W6+ atom.