Materials Data on RbLi2Be2F7 by Materials Project
RbLi2Be2F7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Rb1+ is bonded in a 8-coordinate geometry to ten F1- atoms. There are a spread of Rb–F bond distances ranging from 2.96–3.48 Å. There are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded to four F1- atoms to form LiF4 tetrahedra that share corners with two equivalent LiF4 tetrahedra and corners with four equivalent BeF4 tetrahedra. There are a spread of Li–F bond distances ranging from 1.87–1.91 Å. In the second Li1+ site, Li1+ is bonded to four F1- atoms to form LiF4 tetrahedra that share corners with two equivalent LiF4 tetrahedra and corners with four equivalent BeF4 tetrahedra. There are a spread of Li–F bond distances ranging from 1.87–1.91 Å. There are two inequivalent Be2+ sites. In the first Be2+ site, Be2+ is bonded to four F1- atoms to form BeF4 tetrahedra that share a cornercorner with one BeF4 tetrahedra and corners with four equivalent LiF4 tetrahedra. There are a spread of Be–F bond distances ranging from 1.54–1.61 Å. In the second Be2+ site, Be2+ is bonded to four F1- atoms to form BeF4 tetrahedra that share a cornercorner with one BeF4 tetrahedra and corners with four equivalent LiF4 tetrahedra. There are a spread of Be–F bond distances ranging from 1.54–1.61 Å. There are seven inequivalent F1- sites. In the first F1- site, F1- is bonded in a trigonal planar geometry to two equivalent Li1+ and one Be2+ atom. In the second F1- site, F1- is bonded in a trigonal planar geometry to one Rb1+, two equivalent Li1+, and one Be2+ atom. In the third F1- site, F1- is bonded in a distorted bent 120 degrees geometry to two equivalent Rb1+, one Li1+, and one Be2+ atom. In the fourth F1- site, F1- is bonded in a distorted bent 120 degrees geometry to two equivalent Rb1+, one Li1+, and one Be2+ atom. In the fifth F1- site, F1- is bonded in a distorted bent 120 degrees geometry to two equivalent Rb1+, one Li1+, and one Be2+ atom. In the sixth F1- site, F1- is bonded in a distorted bent 120 degrees geometry to one Rb1+ and two Be2+ atoms. In the seventh F1- site, F1- is bonded in a distorted bent 120 degrees geometry to two equivalent Rb1+, one Li1+, and one Be2+ atom.