Abstract
Gd:CeO2 ceramic samples with a density of up to 96% of the theoretical value have been obtained by rapid 24 GHz microwave sintering with heating rates of up to 300 °C/min and zero hold time. It has been found that a higher absorbed microwave power density lowers the densification onset temperature by up to 150 °C. The grain size in the final materials decreased with an increase in the heating rate at a lower power density (a few W/cm3) but increased at a higher power density (∼ 40 W/cm3). The ionic conductivity of the sintered materials depended on the microwave heating rate; samples sintered at 30 – 100 °C/min had an ionic conductivity of approximately 0.5 S/m at a temperature of 560 °C.
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