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Acta Cryst. (2009). E65, i82 [ doi:10.1107/S1600536809044055 ]
Abstract: The title compound, K5EuLi2F10, belongs to so-called self-activated materials containing lanthanoid ions within the matrix. A common feature of these systems is a large separation between the closest lanthanoid ions, which is one of the crucial factors governing the self-quenching of luminescence. The crystal structure of K5EuLi2F10 is isotypic with other K5RELi2F10 compounds (RE = Nd, Pr). As expected from the lanthanoid contraction, the unit-cell volume for crystal with Eu3+ ions is the smallest of the three structures. Accordingly, the corresponding interatomic RE-RE distances are shorter. In the structure, distorted EuF8 dodecahedra and two different LiF4 tetrahedra, all with m symmetry, are present, forming sheets parallel to (100). The isolated EuF8 dodecahedra exhibit a mean Eu-F distance of 2.356 Å. The K+ cations are located within and between the sheets, leading to highly irregular KFx polyhedra (x = 8-9) around the alkali metal cations.
Online 28 October 2009
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