Microstructure of Powellite-Rich Glass-Ceramics: A Model System for High Level Waste Immobilization

Abstract : In this study, we synthesized glass-ceramics from glasses in the system SiO2B2O3Na2OCaOAl2O3MoO3Gd2O3 by various heat treatments. Glass-ceramics contain only one crystalline phase in the bulk: powellite (CaMoO4). The influence of molybdenum and rare earth contents on powellite crystallization was studied using SEM and XRD. Heat treatments were optimized to lead to a wide range in size and concentration of powellite. Moreover, the molybdenum content left in residual glasses, calculated using XRD quantitation, showed that the residual glasses have a similar composition for a given Gd2O3 content after heat treatments. This work had led to the synthesis of two phase glass-ceramics with constant borosilicate glass matrices and powellite crystals with controlled sizes and concentrations.
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Submitted on : Tuesday, October 16, 2012 - 5:24:41 PM
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Tatiana Taurines, Bruno Boizot. Microstructure of Powellite-Rich Glass-Ceramics: A Model System for High Level Waste Immobilization. Journal of the American Ceramic Society, Wiley, 2012, 95 (3), pp.1105. ⟨10.1111/j.1551-2916.2011.05015.x⟩. ⟨hal-00739049⟩

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