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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on K3YF6 by Materials Project

K3YF6 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 7-coordinate geometry to seven F1- atoms. There are a spread of K–F bond distances ranging from 2.67–3.17 Å. In the second K1+ site, K1+ is bonded to six F1- atoms to form KF6 octahedra that share corners with six equivalent YF6 octahedra. The corner-sharing octahedra tilt angles range from 32–41°. There are a spread of K–F bond distances ranging from 2.61–2.70 Å. Y3+ is bonded to six F1- atoms to form YF6 octahedra that share corners with six equivalent KF6 octahedra. The corner-sharing octahedra tilt angles range from 32–41°. There are a spread of Y–F bond distances ranging from 2.19–2.21 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a 4-coordinate geometry to three K1+ and one Y3+ atom. In the second F1- site, F1- is bonded in a 4-coordinate geometry to three K1+ and one Y3+ atom. In the third F1- site, F1- is bonded in a 5-coordinate geometry to four K1+ and one Y3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2YF5 by Materials Project

K2YF5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.68–2.92 Å. Y3+ is bonded to seven F1- atoms to form distorted edge-sharing YF7 pentagonal bipyramids. There are a spread of Y–F bond distances ranging from 2.21–2.31 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a 4-coordinate geometry to two equivalent K1+ and two equivalent Y3+ atoms. In the second F1- site, F1- is bonded in a 1-coordinate geometry to four equivalent K1+ and one Y3+ atom. In the third F1- site, F1- is bonded in a 5-coordinate geometry to four equivalent K1+ and one Y3+ atom. In the fourth F1- site, F1- is bonded in a 5-coordinate geometry to four equivalent K1+ and one Y3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KYF4 by Materials Project

KYF4 crystallizes in the trigonal P3_1 space group. The structure is three-dimensional. there are six inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to eight F1- atoms to form distorted KF8 hexagonal bipyramids that share a cornercorner with one YF7 pentagonal bipyramid, edges with two KF8 hexagonal bipyramids, and edges with six YF7 pentagonal bipyramids. There are a spread of K–F bond distances ranging from 2.57–3.07 Å. In the second K1+ site, K1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.63–3.06 Å. In the third K1+ site, K1+ is bonded to eight F1- atoms to form distorted KF8 hexagonal bipyramids that share a cornercorner with one YF7 pentagonal bipyramid, edges with two KF8 hexagonal bipyramids, and edges with six YF7 pentagonal bipyramids. There are a spread of K–F bond distances ranging from 2.63–3.06 Å. In the fourth K1+ site, K1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.60–3.01 Å. In the fifth K1+ site, K1+ is bonded to eight F1- atoms to form distorted KF8 hexagonal bipyramids that share a cornercorner with one YF7 pentagonal bipyramid, edges with two KF8 hexagonal bipyramids, and edges with six YF7 pentagonal bipyramids. There are a spread of K–F bond distances ranging from 2.64–3.08 Å. In the sixth K1+ site, K1+ is bonded in a distorted body-centered cubic geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.62–2.93 Å. There are six inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share a cornercorner with one KF8 hexagonal bipyramid, corners with three equivalent YF7 pentagonal bipyramids, edges with three KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.18–2.32 Å. In the second Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share corners with five YF7 pentagonal bipyramids, edges with three KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.23–2.29 Å. In the third Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share a cornercorner with one KF8 hexagonal bipyramid, corners with three equivalent YF7 pentagonal bipyramids, edges with three KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.18–2.31 Å. In the fourth Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share corners with five YF7 pentagonal bipyramids, edges with three KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.23–2.30 Å. In the fifth Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share a cornercorner with one KF8 hexagonal bipyramid, corners with three equivalent YF7 pentagonal bipyramids, edges with three KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.18–2.31 Å. In the sixth Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share corners with five YF7 pentagonal bipyramids, edges with three KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.23–2.30 Å. There are twenty-four inequivalent F1- sites. In the first F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the second F1- site, F1- is bonded in a 2-coordinate geometry to two K1+ and two Y3+ atoms. In the third F1- site, F1- is bonded in a 3-coordinate geometry to one K1+ and two equivalent Y3+ atoms. In the fourth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Y3+ atoms. In the fifth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the sixth F1- site, F1- is bonded in a 2-coordinate geometry to two K1+ and two Y3+ atoms. In the seventh F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Y3+ atoms. In the eighth F1- site, F1- is bonded in a 3-coordinate geometry to one K1+ and two equivalent Y3+ atoms. In the ninth F1- site, F1- is bonded in a 2-coordinate geometry to two K1+ and two Y3+ atoms. In the tenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the eleventh F1- site, F1- is bonded in a 3-coordinate geometry to one K1+ and two equivalent Y3+ atoms. In the twelfth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Y3+ atoms. In the thirteenth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of edge and corner-sharing FK3Y tetrahedra. In the fourteenth F1- site, F1- is bonded to two K1+ and two Y3+ atoms to form a mixture of distorted edge and corner-sharing FK2Y2 tetrahedra. In the fifteenth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form distorted FK3Y tetrahedra that share corners with seven FK3Y tetrahedra and edges with two FK2Y2 tetrahedra. In the sixteenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the seventeenth F1- site, F1- is bonded to two K1+ and two Y3+ atoms to form a mixture of distorted edge and corner-sharing FK2Y2 tetrahedra. In the eighteenth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form distorted FK3Y tetrahedra that share corners with seven FK3Y tetrahedra and edges with two FK2Y2 tetrahedra. In the nineteenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the twentieth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form distorted FK3Y tetrahedra that share corners with seven FK3Y tetrahedra and edges with two FK2Y2 tetrahedra. In the twenty-first F1- site, F1- is bonded to three K1+ and one Y3+ atom to form distorted FK3Y tetrahedra that share corners with eight FK2Y2 tetrahedra and an edgeedge with one FK3Y tetrahedra. In the twenty-second F1- site, F1- is bonded to two K1+ and two Y3+ atoms to form a mixture of distorted edge and corner-sharing FK2Y2 tetrahedra. In the twenty-third F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the twenty-fourth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of distorted edge and corner-sharing FK3Y tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KY3F10 by Materials Project

KY3F10 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. K1+ is bonded to sixteen F1- atoms to form distorted edge-sharing KF16 tetrahedra. There are four shorter (2.81 Å) and twelve longer (3.25 Å) K–F bond lengths. Y3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are four shorter (2.23 Å) and four longer (2.39 Å) Y–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded to one K1+ and three equivalent Y3+ atoms to form a mixture of distorted edge and corner-sharing FKY3 tetrahedra. In the second F1- site, F1- is bonded in a bent 150 degrees geometry to two equivalent K1+ and two equivalent Y3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KY3F10 by Materials Project

KY3F10 crystallizes in the trigonal R3m space group. The structure is three-dimensional. K1+ is bonded in a 7-coordinate geometry to seven F1- atoms. There are one shorter (2.75 Å) and six longer (3.00 Å) K–F bond lengths. Y3+ is bonded to seven F1- atoms to form distorted corner-sharing YF7 pentagonal bipyramids. There are a spread of Y–F bond distances ranging from 2.17–2.67 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two equivalent Y3+ atoms. In the second F1- site, F1- is bonded in a trigonal pyramidal geometry to one K1+ and three equivalent Y3+ atoms. In the third F1- site, F1- is bonded in a linear geometry to two equivalent Y3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KYF4 by Materials Project

KYF4 crystallizes in the trigonal P3_2 space group. The structure is three-dimensional. there are six inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.63–3.05 Å. In the second K1+ site, K1+ is bonded to eight F1- atoms to form distorted KF8 hexagonal bipyramids that share a cornercorner with one YF7 pentagonal bipyramid, edges with three KF8 hexagonal bipyramids, and edges with six YF7 pentagonal bipyramids. There are a spread of K–F bond distances ranging from 2.57–3.08 Å. In the third K1+ site, K1+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.60–3.15 Å. In the fourth K1+ site, K1+ is bonded to eight F1- atoms to form distorted KF8 hexagonal bipyramids that share a cornercorner with one YF7 pentagonal bipyramid, edges with three KF8 hexagonal bipyramids, and edges with six YF7 pentagonal bipyramids. There are a spread of K–F bond distances ranging from 2.62–3.05 Å. In the fifth K1+ site, K1+ is bonded to eight F1- atoms to form distorted KF8 hexagonal bipyramids that share a cornercorner with one YF7 pentagonal bipyramid, edges with three KF8 hexagonal bipyramids, and edges with six YF7 pentagonal bipyramids. There are a spread of K–F bond distances ranging from 2.62–2.93 Å. In the sixth K1+ site, K1+ is bonded to eight F1- atoms to form distorted KF8 hexagonal bipyramids that share a cornercorner with one YF7 pentagonal bipyramid, edges with three KF8 hexagonal bipyramids, and edges with six YF7 pentagonal bipyramids. There are a spread of K–F bond distances ranging from 2.64–3.11 Å. There are six inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share a cornercorner with one KF8 hexagonal bipyramid, corners with three equivalent YF7 pentagonal bipyramids, edges with four KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.18–2.32 Å. In the second Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share corners with five YF7 pentagonal bipyramids, edges with four KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.22–2.30 Å. In the third Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share a cornercorner with one KF8 hexagonal bipyramid, corners with three equivalent YF7 pentagonal bipyramids, edges with five KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.18–2.31 Å. In the fourth Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share corners with five YF7 pentagonal bipyramids, edges with three KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.23–2.30 Å. In the fifth Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share a cornercorner with one KF8 hexagonal bipyramid, corners with three equivalent YF7 pentagonal bipyramids, edges with four KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.18–2.32 Å. In the sixth Y3+ site, Y3+ is bonded to seven F1- atoms to form YF7 pentagonal bipyramids that share a cornercorner with one KF8 hexagonal bipyramid, corners with five YF7 pentagonal bipyramids, edges with four KF8 hexagonal bipyramids, and an edgeedge with one YF7 pentagonal bipyramid. There are a spread of Y–F bond distances ranging from 2.23–2.30 Å. There are twenty-four inequivalent F1- sites. In the first F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the second F1- site, F1- is bonded in a 2-coordinate geometry to two K1+ and two Y3+ atoms. In the third F1- site, F1- is bonded in a 3-coordinate geometry to one K1+ and two equivalent Y3+ atoms. In the fourth F1- site, F1- is bonded in a distorted linear geometry to one K1+ and two Y3+ atoms. In the fifth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the sixth F1- site, F1- is bonded in a 2-coordinate geometry to two K1+ and two Y3+ atoms. In the seventh F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Y3+ atoms. In the eighth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two equivalent Y3+ atoms. In the ninth F1- site, F1- is bonded in a 2-coordinate geometry to two K1+ and two Y3+ atoms. In the tenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the eleventh F1- site, F1- is bonded in a 3-coordinate geometry to one K1+ and two equivalent Y3+ atoms. In the twelfth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Y3+ atoms. In the thirteenth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of edge and corner-sharing FK3Y tetrahedra. In the fourteenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the fifteenth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of distorted edge and corner-sharing FK3Y tetrahedra. In the sixteenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the seventeenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the eighteenth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of distorted edge and corner-sharing FK3Y tetrahedra. In the nineteenth F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the twentieth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of distorted edge and corner-sharing FK3Y tetrahedra. In the twenty-first F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of edge and corner-sharing FK3Y tetrahedra. In the twenty-second F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the twenty-third F1- site, F1- is bonded in a 4-coordinate geometry to two K1+ and two Y3+ atoms. In the twenty-fourth F1- site, F1- is bonded to three K1+ and one Y3+ atom to form a mixture of distorted edge and corner-sharing FK3Y tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3YF6 by Materials Project

Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on KY2F7 by Materials Project

KY2F7 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are four inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 10-coordinate geometry to ten F1- atoms. There are a spread of K–F bond distances ranging from 2.68–2.95 Å. In the second K1+ site, K1+ is bonded in a 5-coordinate geometry to five F1- atoms. There are a spread of K–F bond distances ranging from 2.69–2.77 Å. In the third K1+ site, K1+ is bonded in a 5-coordinate geometry to five F1- atoms. There are a spread of K–F bond distances ranging from 2.70–2.76 Å. In the fourth K1+ site, K1+ is bonded in a 10-coordinate geometry to ten F1- atoms. There are a spread of K–F bond distances ranging from 2.69–2.96 Å. There are five inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a body-centered cubic geometry to eight F1- atoms. There are a spread of Y–F bond distances ranging from 2.23–2.46 Å. In the second Y3+ site, Y3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Y–F bond distances ranging from 2.22–2.43 Å. In the third Y3+ site, Y3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Y–F bond distances ranging from 2.22–2.40 Å. In the fourth Y3+ site, Y3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Y–F bond distances ranging from 2.23–2.46 Å. In the fifth Y3+ site, Y3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Y–F bond distances ranging from 2.21–2.43 Å. There are nineteen inequivalent F1- sites. In the first F1- site, F1- is bonded to one K1+ and three Y3+ atoms to form a mixture of corner and edge-sharing FKY3 tetrahedra. In the second F1- site, F1- is bonded to two K1+ and two Y3+ atoms to form distorted FK2Y2 tetrahedra that share corners with ten FK2Y2 tetrahedra and edges with four FKY3 tetrahedra. In the third F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Y3+ atoms. In the fourth F1- site, F1- is bonded to two K1+ and two equivalent Y3+ atoms to form distorted FK2Y2 tetrahedra that share corners with seven FKY3 tetrahedra and edges with four FK2Y2 tetrahedra. In the fifth F1- site, F1- is bonded to two K1+ and two equivalent Y3+ atoms to form distorted FK2Y2 tetrahedra that share corners with seven FKY3 tetrahedra and edges with six FK2Y2 tetrahedra. In the sixth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Y3+ atoms. In the seventh F1- site, F1- is bonded to two K1+ and two equivalent Y3+ atoms to form distorted FK2Y2 tetrahedra that share corners with seven FKY3 tetrahedra and edges with four FK2Y2 tetrahedra. In the eighth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Y3+ atoms. In the ninth F1- site, F1- is bonded to one K1+ and three Y3+ atoms to form a mixture of distorted corner and edge-sharing FKY3 tetrahedra. In the tenth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Y3+ atoms. In the eleventh F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Y3+ atoms. In the twelfth F1- site, F1- is bonded in a 4-coordinate geometry to one K1+ and three Y3+ atoms. In the thirteenth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Y3+ atoms. In the fourteenth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Y3+ atoms. In the fifteenth F1- site, F1- is bonded to one K1+ and three Y3+ atoms to form FKY3 tetrahedra that share corners with six FK2Y2 tetrahedra and edges with three FKY3 tetrahedra. In the sixteenth F1- site, F1- is bonded to two K1+ and two equivalent Y3+ atoms to form a mixture of distorted corner and edge-sharing FK2Y2 tetrahedra. In the seventeenth F1- site, F1- is bonded in a 4-coordinate geometry to one K1+ and three Y3+ atoms. In the eighteenth F1- site, F1- is bonded to two K1+ and two Y3+ atoms to form distorted FK2Y2 tetrahedra that share corners with ten FKY3 tetrahedra and edges with four FK2Y2 tetrahedra. In the nineteenth F1- site, F1- is bonded to one K1+ and three Y3+ atoms to form a mixture of distorted corner and edge-sharing FKY3 tetrahedra.

36 MATERIALS SCIENCE↗