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High-temperature monoclinic α-SrHfF6, and isostructural α-SrZrF6: associating Hf2F12 bipolyhedra and SrF8 snub
Jean Paul Laval1, Richard Mayet1
1Institut de recherche sur les céramiques, IRCER-UMR-CNRS 7315, Université de Limoges, Faculté des Sciences, 12 rue Atlantis, 87068 Limoges, France.
Abstract:
The structure of the high-temperature monoclinic variety α-SrHfF6 (strontium hafnium hexafluoride) [and of isostructural α-SrZrF6 (strontium zirconium hexafluoride)] associates Hf2F12 bipolyhedra and SrF8 snub disphenoids, forming zigzag twisted [SrF6]n layers. The distribution of the Hf and Sr polyhedra forms a three-dimensional framework which can be related to the family of anion-excess ReO3-related superstructures. α-SrHfF6 corresponds to a new ABX6 type and is compared to the other main families already described. A partial amorphization of this structure is observed in samples quenched from the melt.
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