Materials Data on RbCeF4 by Materials Project
RbCeF4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Rb1+ is bonded in a 7-coordinate geometry to seven F1- atoms. There are a spread of Rb–F bond distances ranging from 2.75–2.90 Å. Ce3+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of Ce–F bond distances ranging from 2.33–2.55 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded to two equivalent Rb1+ and two equivalent Ce3+ atoms to form distorted FRb2Ce2 tetrahedra that share corners with ten FRb2Ce2 tetrahedra and an edgeedge with one FRbCe3 tetrahedra. In the second F1- site, F1- is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ce3+ atoms. In the third F1- site, F1- is bonded to one Rb1+ and three equivalent Ce3+ atoms to form FRbCe3 tetrahedra that share corners with eight FRb2Ce2 tetrahedra and edges with three FRbCe3 tetrahedra. In the fourth F1- site, F1- is bonded in a 5-coordinate geometry to four equivalent Rb1+ and one Ce3+ atom.