Abstract
In this study, we synthesized glass‐ceramics from glasses in the system SiO2–B2O3–Na2O–CaO–Al2O3–MoO3–Gd2O3 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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