DOI: 10.17188/1710378
title: Materials Data on GdTa3O9 by Materials Project

description: GdTa3O9 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Gd3+ sites. In the first Gd3+ site, Gd3+ is bonded to twelve O2- atoms to form distorted GdO12 cuboctahedra that share corners with two equivalent GdO12 cuboctahedra, faces with two equivalent GdO12 cuboctahedra, and faces with eight TaO6 octahedra. There are a spread of Gd–O bond distances ranging from 2.51–2.97 Å. In the second Gd3+ site, Gd3+ is bonded in a 12-coordinate geometry to ten O2- atoms. There are a spread of Gd–O bond distances ranging from 2.49–2.83 Å. There are six inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with six TaO6 octahedra and a faceface with one GdO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 3–16°. There are a spread of Ta–O bond distances ranging from 1.97–2.00 Å. In the second Ta5+ site, Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with six TaO6 octahedra and faces with three equivalent GdO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 3–17°. There are a spread of Ta–O bond distances ranging from 1.91–2.09 Å. In the third Ta5+ site, Ta5+ is bonded to six O2- atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 4–21°. There are a spread of Ta–O bond distances ranging from 1.92–2.08 Å. In the fourth Ta5+ site, Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with six TaO6 octahedra and faces with three equivalent GdO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 4–17°. There are a spread of Ta–O bond distances ranging from 1.92–2.06 Å. In the fifth Ta5+ site, Ta5+ is bonded to six O2- atoms to form TaO6 octahedra that share corners with six TaO6 octahedra and a faceface with one GdO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 3–17°. There are a spread of Ta–O bond distances ranging from 1.96–1.99 Å. In the sixth Ta5+ site, Ta5+ is bonded to six O2- atoms to form distorted corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 5–21°. There are a spread of Ta–O bond distances ranging from 1.90–2.11 Å. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Gd3+ and two Ta5+ atoms. In the second O2- site, O2- is bonded in a distorted linear geometry to one Gd3+ and two Ta5+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to three equivalent Gd3+ and two Ta5+ atoms. In the fourth O2- site, O2- is bonded in a distorted T-shaped geometry to one Gd3+ and two Ta5+ atoms. In the fifth O2- site, O2- is bonded in a distorted T-shaped geometry to one Gd3+ and two Ta5+ atoms. In the sixth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Gd3+ and two Ta5+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Gd3+ and two Ta5+ atoms. In the eighth O2- site, O2- is bonded in a distorted linear geometry to one Gd3+ and two Ta5+ atoms. In the ninth O2- site, O2- is bonded in a distorted linear geometry to one Gd3+ and two Ta5+ atoms. 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 linear geometry to two Ta5+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted linear geometry to one Gd3+ and two Ta5+ atoms. In the fourteenth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Gd3+ and two Ta5+ atoms. In the fifteenth O2- site, O2- is bonded in a distorted linear geometry to one Gd3+ and two Ta5+ atoms. In the sixteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Gd3+ and two Ta5+ atoms. In the seventeenth O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+ and two Ta5+ atoms. In the eighteenth O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+ and two Ta5+ atoms.