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Pentapotassium praseodymium(III) dilithium decafluoride, K5PrLi2F10

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Author(s): Anna Gagor

Journal: Acta Crystallographica Section E
ISSN 1600-5368

Volume: 65;
Issue: 11;
Start page: i81;
Date: 2009;
Original page

ABSTRACT
The crystal structure of K5PrLi2F10 is isotypic with those of other K5RELi2F10 compounds (RE = Eu, Nd). The lanthanoid ions are isolated in K5PrLi2F10, with a mean separation between the Pr ions of 7.356 Å. It classifies this crystal as a so-called self-activated material containing lanthanoid ions within the matrix. Except for two K+ and two F− ions, all atoms are located on sites with m symmetry. In the structure, distorted PrF8 dodecahedra and two different LiF4 tetrahedra share F atoms, forming sheets parallel to (100). The isolated PrF8 dodecahedra exhibit a mean Pr—F distance of 2.406 Å. The K+ cations are located within and between these sheets, leading to highly irregular KFx polyhedra with coordination numbers of eight and nine for the alkali metal cations.

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