DOI: 10.17188/1268804
title: Materials Data on Ba3AlF9 by Materials Project

description: Ba3AlF9 crystallizes in the orthorhombic Pnc2 space group. The structure is three-dimensional. there are seven inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten F1- atoms. There are a spread of Ba–F bond distances ranging from 2.59–3.25 Å. In the second Ba2+ site, Ba2+ is bonded in a 12-coordinate geometry to twelve F1- atoms. There are a spread of Ba–F bond distances ranging from 2.71–3.15 Å. In the third Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight F1- atoms. There are a spread of Ba–F bond distances ranging from 2.62–2.89 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten F1- atoms. There are a spread of Ba–F bond distances ranging from 2.62–3.12 Å. In the fifth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Ba–F bond distances ranging from 2.65–3.09 Å. In the sixth Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Ba–F bond distances ranging from 2.64–3.16 Å. In the seventh Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Ba–F bond distances ranging from 2.69–3.03 Å. There are three inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Al–F bond distances ranging from 1.81–1.87 Å. In the second Al3+ site, Al3+ is bonded in an octahedral geometry to six F1- atoms. There is two shorter (1.83 Å) and four longer (1.84 Å) Al–F bond length. In the third Al3+ site, Al3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Al–F bond distances ranging from 1.81–1.86 Å. There are nineteen inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the second F1- site, F1- is bonded in a distorted rectangular see-saw-like geometry to four Ba2+ atoms. In the third F1- site, F1- is bonded to four Ba2+ atoms to form a mixture of distorted corner and edge-sharing FBa4 tetrahedra. In the fourth F1- site, F1- is bonded in a single-bond geometry to three Ba2+ and one Al3+ atom. In the fifth F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the sixth F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the seventh F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the eighth F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the ninth F1- site, F1- is bonded in a distorted single-bond geometry to two Ba2+ and one Al3+ atom. In the tenth F1- site, F1- is bonded to four Ba2+ atoms to form a mixture of distorted corner and edge-sharing FBa4 tetrahedra. In the eleventh F1- site, F1- is bonded to four Ba2+ atoms to form a mixture of distorted corner and edge-sharing FBa4 tetrahedra. In the twelfth F1- site, F1- is bonded to four Ba2+ atoms to form a mixture of distorted corner and edge-sharing FBa4 tetrahedra. In the thirteenth F1- site, F1- is bonded in a distorted single-bond geometry to two Ba2+ and one Al3+ atom. In the fourteenth F1- site, F1- is bonded in a 3-coordinate geometry to three Ba2+ atoms. In the fifteenth F1- site, F1- is bonded in a single-bond geometry to two Ba2+ and one Al3+ atom. In the sixteenth F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the seventeenth F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the eighteenth F1- site, F1- is bonded in a distorted single-bond geometry to three Ba2+ and one Al3+ atom. In the nineteenth F1- site, F1- is bonded to four Ba2+ atoms to form a mixture of distorted corner and edge-sharing FBa4 tetrahedra.