Pb9AI2F24 fluoride: Phase transition and electrical characterization of the high-temperature form |
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| Authors: | Mohamed El Omari Jean-Maurice Réau Jean Ravez |
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| Institution: | 1. Department of Chemistry , Faculty of Science, Moulay Isma?l University , Meknes, Morocco;2. Institut de Chimie de la matiére Condensée de Bordeaux CNRS , Chateau Brivazac, Pessac, F-33600, France |
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| Abstract: | A phase transition at T r = 365±10K is shown for Pb9Al2F24 by high-temperature X-ray diffraction, microcalorimetric and electrical measurements. The AC conductivity data of Pb9Al2F24 are analyzed in the Z*, M* and ε* formalisms and the conductivity relaxation parameters are determined. The high-temperature form of Pb9Al2F24 is characterized by an activation energy (Δσ)h.t. close to that of the (x = 0.12) limiting composition of the Pb1-.xAlxF2 2+x solid solution with fluorite-type structure. |
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| Keywords: | Phase transition F? ionic conductors Fluorides |
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