Abstract
The application of Ba1-xSrxTiO3-based composites in microwave field has become a popular research topic. Ba0.5Sr0.5TiO3-ZnAl2O4 (BST-ZA) composite ceramics were successfully fabricated by both conventional sintering and two-step sintering process. The microstructure and dielectric properties of Ba0.5Sr0.5TiO3-ZnAl2O4 composite ceramics prepared by two sintering methods were compared. The samples prepared by the two-step sintering method have lower ion diffusion degree, shorter holding time and lower energy consumption, and it is easier to obtain samples with higher density and uniform grain size distribution, compared with those fabricated by the conventional sintering method. The dielectric permittivity and Curie temperature of two-step sintered samples are lower than those obtained by conventional sintering, while the dielectric tunability is almost unchanged (two-step sintering: 17.7 %, conventional sintering: 18.6 %). These results indicate that two-step sintering method is an efficient and energy-saving method in preparing BST-ZA composites.
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