Materials Data on K3Nb7O19 by Materials Project
K3Nb7O19 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are six inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.84–3.21 Å. In the second K1+ site, K1+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of K–O bond distances ranging from 2.66–2.77 Å. In the third K1+ site, K1+ is bonded in a distorted square co-planar geometry to four O2- atoms. There are a spread of K–O bond distances ranging from 2.67–2.83 Å. In the fourth K1+ site, K1+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of K–O bond distances ranging from 2.68–2.78 Å. In the fifth K1+ site, K1+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of K–O bond distances ranging from 2.67–2.82 Å. In the sixth K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.82–3.23 Å. There are fourteen inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 1–9°. There are a spread of Nb–O bond distances ranging from 1.88–2.22 Å. In the second Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 9–11°. There are a spread of Nb–O bond distances ranging from 1.89–2.20 Å. In the third Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 6–30°. There are a spread of Nb–O bond distances ranging from 1.84–2.36 Å. In the fourth Nb5+ site, Nb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.84–2.36 Å. In the fifth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 0–13°. There are a spread of Nb–O bond distances ranging from 1.92–2.13 Å. In the sixth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 0–11°. There are a spread of Nb–O bond distances ranging from 1.92–2.12 Å. In the seventh Nb5+ site, Nb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.85–2.31 Å. In the eighth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 10–11°. There are a spread of Nb–O bond distances ranging from 1.85–2.27 Å. In the ninth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 5–11°. There are a spread of Nb–O bond distances ranging from 1.86–2.33 Å. In the tenth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 7–30°. There are a spread of Nb–O bond distances ranging from 1.86–2.33 Å. In the eleventh Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 1–9°. There are a spread of Nb–O bond distances ranging from 1.89–2.20 Å. In the twelfth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 10–11°. There are a spread of Nb–O bond distances ranging from 1.86–2.27 Å. In the thirteenth Nb5+ site, Nb5+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Nb–O bond distances ranging from 1.85–2.31 Å. In the fourteenth Nb5+ site, Nb5+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing NbO6 octahedra. The corner-sharing octahedra tilt angles range from 6–10°. There are a spread of Nb–O bond distances ranging from 1.89–2.19 Å. There are thirty-nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to four Nb5+ atoms. In the third O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the fourth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the fifth O2- site, O2- is bonded to two K1+ and two Nb5+ atoms to form a mixture of distorted edge and corner-sharing OK2Nb2 tetrahedra. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two K1+ and two Nb5+ atoms. In the seventh O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the eighth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the ninth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the tenth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the eleventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+ and two Nb5+ atoms. In the twelfth O2- site, O2- is bonded in a 4-coordinate geometry to two K1+ and two Nb5+ atoms. In the thirteenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the fifteenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the sixteenth O2- site, O2- is bonded to two K1+ and two equivalent Nb5+ atoms to form a mixture of distorted edge and corner-sharing OK2Nb2 tetrahedra. In the seventeenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one K1+ and two Nb5+ atoms. In the eighteenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the nineteenth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the twentieth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the twenty-first O2- site, O2- is bonded in a 4-coordinate geometry to two K1+ and two Nb5+ atoms. In the twenty-second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to four Nb5+ atoms. In the twenty-third O2- site, O2- is bonded in a 4-coordinate geometry to two K1+ and two Nb5+ atoms. In the twenty-fourth O2- site, O2- is bonded in a 3-coordinate geometry to three Nb5+ atoms. In the twenty-fifth O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the twenty-sixth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the twenty-seventh O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms. In the twenty-eighth O2- site, O2- is bonded in a 4-coordinate geometry to one K1+ and three Nb5+ atoms. In the twenty-ninth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the thirtieth O2- site, O2- is bonded to two K1+ and two Nb5+ atoms to form distorted corner-sharing OK2Nb2 tetrahedra. In the thirty-first O2- site, O2- is bonded to two K1+ and two equivalent Nb5+ atoms to form a mixture of distorted edge and corner-sharing OK2Nb2 tetrahedra. In the thirty-second O2- site, O2- is bonded in a linear geometry to two Nb5+ atoms. In the thirty-third O2- site, O2- is bonded in a 4-coordinate geometry to one K1+ and three Nb5+ atoms. In the thirty-fourth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the thirty-fifth O2- site, O2- is bonded in a distorted linear geometry to one K1+ and two Nb5+ atoms. In the thirty-sixth O2- site, O2- is bonded in a 2-coordinate geometry to two K1+ and two Nb5+ atoms. In the thirty-seventh O2- site, O2- is bonded in a 4-coordinate geometry to two K1+ and two Nb5+ atoms. In the thirty-eighth O2- site, O2- is bonded in a 3-coordinate geometry to three Nb5+ atoms. In the thirty-ninth O2- site, O2- is bonded in a linear geometry to two equivalent Nb5+ atoms.