Abstract
Anion-excess fluorite-typeCa 0.68 Ln 0.32F 2.32series and Ca 2 LnF 7-related low-temperature superstructures were studied by EXAFS. This analysis, completed with a structure refinement of Ca 2LuF 7, shows the narrow analogy between clustering in ordered and disordered states. It confirms the change in short-range order when Ln 3+size increases, as previously evidenced by a neutron diffraction study.
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