Materials Data on KTm2F7 by Materials Project
KTm2F7 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 2.65–2.92 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 2.64–2.72 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 2.65–2.71 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 2.66–2.93 Å. There are five inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded in a body-centered cubic geometry to eight F1- atoms. There are a spread of Tm–F bond distances ranging from 2.17–2.40 Å. In the second Tm3+ site, Tm3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Tm–F bond distances ranging from 2.18–2.39 Å. In the third Tm3+ site, Tm3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Tm–F bond distances ranging from 2.18–2.35 Å. In the fourth Tm3+ site, Tm3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Tm–F bond distances ranging from 2.18–2.42 Å. In the fifth Tm3+ site, Tm3+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Tm–F bond distances ranging from 2.15–2.39 Å. There are nineteen inequivalent F1- sites. In the first F1- site, F1- is bonded to one K1+ and three Tm3+ atoms to form a mixture of corner and edge-sharing FKTm3 tetrahedra. In the second F1- site, F1- is bonded to two K1+ and two Tm3+ atoms to form distorted FK2Tm2 tetrahedra that share corners with ten FK2Tm2 tetrahedra and edges with four FKTm3 tetrahedra. In the third F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Tm3+ atoms. In the fourth F1- site, F1- is bonded to two K1+ and two equivalent Tm3+ atoms to form distorted FK2Tm2 tetrahedra that share corners with seven FKTm3 tetrahedra and edges with four FK2Tm2 tetrahedra. In the fifth F1- site, F1- is bonded to two K1+ and two equivalent Tm3+ atoms to form distorted FK2Tm2 tetrahedra that share corners with seven FKTm3 tetrahedra and edges with six FK2Tm2 tetrahedra. In the sixth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Tm3+ atoms. In the seventh F1- site, F1- is bonded to two K1+ and two equivalent Tm3+ atoms to form distorted FK2Tm2 tetrahedra that share corners with seven FKTm3 tetrahedra and edges with four FK2Tm2 tetrahedra. In the eighth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Tm3+ atoms. In the ninth F1- site, F1- is bonded to one K1+ and three Tm3+ atoms to form a mixture of distorted corner and edge-sharing FKTm3 tetrahedra. In the tenth F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Tm3+ atoms. In the eleventh F1- site, F1- is bonded in a distorted bent 150 degrees geometry to one K1+ and two equivalent Tm3+ atoms. In the twelfth F1- site, F1- is bonded in a 4-coordinate geometry to one K1+ and three Tm3+ atoms. In the thirteenth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Tm3+ atoms. In the fourteenth F1- site, F1- is bonded in a 2-coordinate geometry to one K1+ and two Tm3+ atoms. In the fifteenth F1- site, F1- is bonded to one K1+ and three Tm3+ atoms to form FKTm3 tetrahedra that share corners with six FK2Tm2 tetrahedra and edges with three FKTm3 tetrahedra. In the sixteenth F1- site, F1- is bonded to two K1+ and two equivalent Tm3+ atoms to form a mixture of distorted corner and edge-sharing FK2Tm2 tetrahedra. In the seventeenth F1- site, F1- is bonded in a 4-coordinate geometry to one K1+ and three Tm3+ atoms. In the eighteenth F1- site, F1- is bonded to two K1+ and two Tm3+ atoms to form distorted FK2Tm2 tetrahedra that share corners with ten FKTm3 tetrahedra and edges with four FK2Tm2 tetrahedra. In the nineteenth F1- site, F1- is bonded to one K1+ and three Tm3+ atoms to form a mixture of distorted corner and edge-sharing FKTm3 tetrahedra.