DOE OSTI2020
YTa3O9 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are two inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a 12-coordinate geometry to eleven O2- atoms. There are a spread of Y–O bond distances ranging from 2.38–2.82 Å. In the second Y3+ site, Y3+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of Y–O bond distances ranging from 2.40–2.97 Å. There are six 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 0–19°. There are a spread of Ta–O bond distances ranging from 1.91–2.07 Å. In the second Ta5+ site, Ta5+ is bonded to six O2- atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 1–15°. There are a spread of Ta–O bond distances ranging from 1.95–2.00 Å. In the third Ta5+ site, Ta5+ is bonded to six O2- atoms to form distorted corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 3–19°. There are a spread of Ta–O bond distances ranging from 1.90–2.13 Å. In the fourth Ta5+ site, Ta5+ is bonded to six O2- atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 1–15°. There are a spread of Ta–O bond distances ranging from 1.95–1.99 Å. In the fifth Ta5+ site, Ta5+ is bonded to six O2- atoms to form distorted corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 3–19°. There are a spread of Ta–O bond distances ranging from 1.89–2.12 Å. In the sixth Ta5+ site, Ta5+ is bonded to six O2- atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedra tilt angles range from 0–19°. There are a spread of Ta–O bond distances ranging from 1.91–2.07 Å. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to one Y3+ and two Ta5+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two Ta5+ atoms. In the third O2- site, O2- is bonded in a linear geometry to one Y3+ and two Ta5+ atoms. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Y3+ and two Ta5+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Y3+ and two Ta5+ atoms. In the sixth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Y3+ and two Ta5+ atoms. In the seventh O2- site, O2- is bonded in a distorted linear geometry to one Y3+ and two Ta5+ atoms. In the eighth O2- site, O2- is bonded in a distorted linear geometry to one Y3+ and two Ta5+ atoms. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to two Y3+ and two Ta5+ atoms. In the tenth O2- site, O2- is bonded in a 3-coordinate geometry to three Y3+ and 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 2-coordinate geometry to one Y3+ and two Ta5+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Y3+ and two Ta5+ atoms. In the fifteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Y3+ and two Ta5+ atoms. In the sixteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Y3+ and two Ta5+ atoms. In the seventeenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Y3+ and two Ta5+ atoms. In the eighteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Y3+ and two Ta5+ atoms.