Single-phase marićite, NaFePO4, was synthesized from a mixture of monosodium phosphate and iron oxalate at 750 °C and atmospheric pressure. Thermal treatment of synthetic marićite in air led to its oxidative decomposition into Na3(PO4)3 NASICON and α-Fe2O3, which started at temperatures slightly below 225 °C. Intergrowth of the two reaction products is found to occur at the nanoscale without identified crystallographic relationship with the marićite precursor. Electrochemical activity of the reaction product is confirmed with the reversible insertion of one Na at 2.55 V versus Na+/Na0.
Oxidative decomposition products of synthetic NaFePO4 marićite: nano-textural and electrochemical characterization
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Fabrice Brunet, Camille Crouzet, Sorina Cretu, Rénald David, Matthieu Courty, Arnaud Demortière, Nadir Recham; Oxidative decomposition products of synthetic NaFePO4 marićite: nano-textural and electrochemical characterization. European Journal of Mineralogy doi: https://doi.org/10.1127/ejm/2019/0031-2885
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