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Etude cristallochimique et physico-chimique de matériaux phosphatés et fluorophosphatés à base de cadmium

Abstract : This work is devoted to the crystallographic study and the electrochemical and optical properties of cadmium phosphates and fluorophosphates. The investigation of the NaF - CdO - NaPO3 system revealed a new fluorophosphate of formula Na2CdPO4F and the polymorphism of the phosphate NaCdPO4. The crystal structures of these two phases were solved using XRD powder diffraction data, from materials obtained by a ceramic route. The characterization of the fluorophosphate Na2CdPO4F was also carried out by infrared spectroscopy, Raman scattering and Nuclear Magnetic Resonance. The electrochemical study, carried out on solid solutions of the Na2(Cd/Mn)PO4F type, revealed that the simultaneous presence of two divalent cations was beneficial for the improvement of the sodation/desodation rates. The luminescence properties of the red emitters NaCdPO4: Eu3+ and Na2CdPO4F: Eu3+ are closely correlated with the structural properties. Some formulations of NaCdPO4: Eu3+ type are of interest for application as red components in light emitting devices. The study of the LiF - CdO - NaPO3 system revealed the existence of an original fluorophosphate of formula Li4Na41Cd30P30O117F20. Its crystal structure, determined on monocrystal, is characterized by the presence of a novel entity PO3F2, where the phosphorus admits a five-fold coordination.
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Mohamed Aboussatar. Etude cristallochimique et physico-chimique de matériaux phosphatés et fluorophosphatés à base de cadmium. Matériaux. Université Blaise Pascal - Clermont-Ferrand II; Université de Sfax (Tunisie), 2016. Français. ⟨NNT : 2016CLF22785⟩. ⟨tel-01815971⟩

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