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Direct observations of the dopant environment in fluorites using EXAFS

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Abstract

Calcium fluoride (CaF2), like the important UO2 phase, is a defect system having the remarkable property that large concentrations of trivalent rare-earth dopants can be accommodated within its structure with no loss of structural integrity. Using extended X-ray absorption fine structure (EXAFS), we have observed the way in which the local structural environment of the impurity alters with the size of the rare-earth ion and can distinguish, by computer lattice simulation studies, between dimer and hexamer configurations for light and heavy dopants, respectively.

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Authors and Affiliations

  1. Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK

    C. R. A. Catlow & L. M. Moroney

  2. Department of Chemistry, University of Kent at Canterbury, Canterbury, Kent, CT2 7NH, UK

    A. V. Chadwick

  3. Science and Engineering Research Council, Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, UK

    G. N. Greaves

Authors
  1. C. R. A. Catlow
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  2. A. V. Chadwick
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  3. G. N. Greaves
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  4. L. M. Moroney
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Catlow, C., Chadwick, A., Greaves, G. et al. Direct observations of the dopant environment in fluorites using EXAFS. Nature 312, 601–604 (1984). https://doi.org/10.1038/312601a0

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