Formation of CeSiO4 from cerium(III) silicate precursors

2019 
Even if the preparation of CeSiO4 has already been reported, the formation of pure cerium silicate from aqueous precursors appears as a challenge. An innovative way of synthesis has been identified in this study allowing the formation of CeSiO4 after hydrothermal treatment starting from Ce(III) silicate precursors. Among the experimental parameters examined, significant effects were found according to the nature of the precursor and reactive media considered, pH of the reactive media and temperature of the hydrothermal process. This study allows to determine optimized conditions for the hydrothermal synthesis of pure CeSiO4 (A Ce2Si2O7 or Ce4.67(SiO4)3O as starting precursors, nitric medium, pH = 7, 7 days at 150°C). In situ low oxidation rate of Ce(III) into Ce(IV) was a key parameter to consider in order to avoid the presence of CeO2 in the final mixtures
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