Study on the Intrinsic Correlation between Sintering Method, Ion Diffusion, and Dielectric Properties of Ba 0.5 Sr 0.5 TiO 3 ‐ZnAl 2 O 4 Composite Ceramics

Ba 0.5 Sr 0.5 TiO 3 ‐ZnAl 2 O 4 composite ceramics of different components are prepared by solid‐phase sintering and microwave sintering, respectively. The ion diffusion phenomenon between the two phases under different sintering methods and the effect of sintering method on the microstructure and dielectric properties of composite ceramics are studied. The results show that during solid‐phase sintering, the generation of liquid phase can effectively enhance the ion diffusion between the two phases. Compared with solid‐phase sintering, microwave sintering effectively reduces the sintering temperature of composite ceramics, and the refinement of grains enhances the ion diffusion between the two phases, resulting in an increase in the Ba/Sr ratio, and the Curie temperature moves to high temperature and increases the tunability. Under microwave sintering conditions, when the ZnAl 2 O 4 content is 50 wt%, the tunability of the composite ceramics reaches 40.03%, and it has a good Q ‐value.