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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on GdTa3O9 by Materials Project

GdTa3O9 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Gd3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Gd–O bond distances ranging from 2.38–2.55 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 two equivalent TaO7 pentagonal bipyramids, and edges with two equivalent TaO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 34°. There are a spread of Ta–O bond distances ranging from 1.98–2.01 Å. In the second Ta5+ site, Ta5+ is bonded to seven O2- atoms to form TaO7 pentagonal bipyramids that share a cornercorner with one TaO6 octahedra, corners with two equivalent TaO7 pentagonal bipyramids, an edgeedge with one TaO6 octahedra, and edges with two equivalent TaO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 39°. There are a spread of Ta–O bond distances ranging from 1.92–2.22 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Gd3+ and two equivalent Ta5+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+ and two equivalent Ta5+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Gd3+ and two Ta5+ atoms. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Gd3+ and two equivalent Ta5+ atoms. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Ta5+ atoms. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Ta5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdTa3O9 by Materials Project

GdTa3O9 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Gd3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Gd–O bond distances ranging from 2.39–2.74 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 two equivalent TaO7 pentagonal bipyramids, and edges with two equivalent TaO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 33°. There are a spread of Ta–O bond distances ranging from 1.98–2.01 Å. In the second Ta5+ site, Ta5+ is bonded to seven O2- atoms to form distorted TaO7 pentagonal bipyramids that share a cornercorner with one TaO6 octahedra, corners with two equivalent TaO7 pentagonal bipyramids, an edgeedge with one TaO6 octahedra, and edges with two equivalent TaO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 37°. There are a spread of Ta–O bond distances ranging from 1.95–2.24 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Ta5+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+ and two equivalent Ta5+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Gd3+ and two equivalent Ta5+ atoms. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Gd3+ and two equivalent Ta5+ atoms. In the fifth O2- site, O2- is bonded in a distorted linear geometry to one Gd3+ and two equivalent Ta5+ atoms. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Gd3+ and two Ta5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdTa3O9 by Materials Project

GdTa3O9 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Gd3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Gd–O bond distances ranging from 2.37–2.51 Å. There are two inequivalent Ta5+ sites. In the first Ta5+ site, Ta5+ is bonded to six O2- atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 30–49°. There are a spread of Ta–O bond distances ranging from 1.96–2.04 Å. In the second Ta5+ site, Ta5+ is bonded to six O2- atoms to form a mixture of corner and edge-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 32–49°. There are a spread of Ta–O bond distances ranging from 1.87–2.20 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Ta5+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+ and two Ta5+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Gd3+ and two equivalent Ta5+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+ and two equivalent Ta5+ atoms. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to two Ta5+ atoms. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one Gd3+ and two equivalent Ta5+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdTa3O9 by Materials Project

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.

36 MATERIALS SCIENCE↗