DOI: 10.17188/1263296
title: Materials Data on Ca9PrF20 by Materials Project

description: Ca9PrF20 is Fluorite-derived structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are nine inequivalent Ca sites. In the first Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.37–2.41 Å. In the second Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.37–2.41 Å. In the third Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.37–2.42 Å. In the fourth Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.40–2.43 Å. In the fifth Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.38–2.44 Å. In the sixth Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.38–2.45 Å. In the seventh Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.37–2.41 Å. In the eighth Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.37–2.42 Å. In the ninth Ca site, Ca is bonded in a body-centered cubic geometry to eight F atoms. There are a spread of Ca–F bond distances ranging from 2.37–2.43 Å. Pr is bonded in a body-centered cubic geometry to eight F atoms. There are seven shorter (2.48 Å) and one longer (2.49 Å) Pr–F bond lengths. There are twenty inequivalent F sites. In the first F site, F is bonded to three Ca and one Pr atom to form FCa3Pr tetrahedra that share corners with sixteen FCa3Pr tetrahedra and edges with six FCa4 tetrahedra. In the second F site, F is bonded to three Ca and one Pr atom to form FCa3Pr tetrahedra that share corners with sixteen FCa4 tetrahedra and edges with six FCa3Pr tetrahedra. In the third F site, F is bonded to four Ca atoms to form FCa4 tetrahedra that share corners with sixteen FCa4 tetrahedra and edges with six FCa3Pr tetrahedra. In the fourth F site, F is bonded to four Ca atoms to form FCa4 tetrahedra that share corners with sixteen FCa4 tetrahedra and edges with six FCa3Pr tetrahedra. In the fifth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the sixth F site, F is bonded to three Ca and one Pr atom to form a mixture of corner and edge-sharing FCa3Pr tetrahedra. In the seventh F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the eighth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the ninth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the tenth F site, F is bonded to four Ca atoms to form FCa4 tetrahedra that share corners with sixteen FCa4 tetrahedra and edges with six FCa3Pr tetrahedra. In the eleventh F site, F is bonded to three Ca and one Pr atom to form a mixture of corner and edge-sharing FCa3Pr tetrahedra. In the twelfth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the thirteenth F site, F is bonded to three Ca and one Pr atom to form FCa3Pr tetrahedra that share corners with sixteen FCa4 tetrahedra and edges with six FCa3Pr tetrahedra. In the fourteenth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the fifteenth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the sixteenth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the seventeenth F site, F is bonded to four Ca atoms to form a mixture of corner and edge-sharing FCa4 tetrahedra. In the eighteenth F site, F is bonded to three Ca and one Pr atom to form a mixture of corner and edge-sharing FCa3Pr tetrahedra. In the nineteenth F site, F is bonded to three Ca and one Pr atom to form a mixture of corner and edge-sharing FCa3Pr tetrahedra. In the twentieth F site, F is bonded to three Ca and one Pr atom to form a mixture of corner and edge-sharing FCa3Pr tetrahedra.