Due to their rapid, selective, and volumetric heating, microwaves have been widely used in\nthe past to enhance solid-state reactions as well as the synthesis of ceramic pigments. The aim of this\nwork is to present a case study involving the preparation of blue CoAl2O4 pigment using different\nmicrowave applicators and generator frequencies, showing the advantages which can derive from\na properly designed microwave reactor for the solid-state synthesis of such pigment. The results\nshow that, when using a properly designed microwave applicator, the specific energy consumption\ncan be significantly lowered compared to conventional heating techniques. Consistently with the\ndata on the dielectric properties of precursors found in literature, the microwave processing of cobalt\noxide and aluminum hydroxide mixtures resulted more favorable at 2.45 GHz than at 5.8 GHz\nmicrowave frequency.
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