Abstract
In this study, the effects of CaTiO3 addition on the sintering characteristics and microwave dielectric properties of BiSbO4 were investigated. Pure BiSbO4 achieved a sintered density of 8.46g/cm3 at 1100°C. The value of sintered density decreased with increasing CaTiO3, and sintering at a temperature higher than 1100°C led to a large weight loss (>2wt%) caused by the volatile nature of the compound. Samples either sintered above 1100°C or with a CaTiO3 content exceeding 3wt% showed poor densification. SEM micrographs revealed microstructures with bimodal grain size distribution. The size of the smaller grains ranged from 0.5 to 1.2μm and that of the larger grains between 3 and 7μm. The microwave dielectric properties of the (1−x) BiSbO4−x CaTiO3 ceramics are dependent both on the x value and on the sintering temperature. The 99.0wt% BiSbO4–1.0wt% CaTiO3 ceramic sintered at 1100°C reported overall microwave dielectric properties that can be summarized as εr≈21.8, Q×f≈61,150GHz, and τf≈−40.1ppm/°C, all superior to those of the BiSbO4 ceramics sintered with other additives.
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