The Structure and Dielectric Tunable Properties of Fine-Grained Ba0.6Sr0.4TiO3 Ceramics Prepared by Spark Plasma Sintering |
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| Authors: | Hao Xue Zhaoxian Xiong Heping Zhou |
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| Affiliation: | Department of Materials Science and Engineering, Xiamen University, Xiamen 361005, China; Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Barium strontium titanate is a promising material for microwave-phased array applications. 1,2 In this study, highly dense and fine-grained Ba0.6Sr0.4TiO3 ceramics were prepared using the spark plasma sintering (SPS) technique. The structure and dielectric tunable properties of the samples were investigated. The "distorted nano-region" emerged in the interior of the grains of SPS samples, and resulted in the deterioration of the dielectric tunable properties of Ba x Sr1? x TiO3. This phenomenon indirectly testified to the assumption of the "polar nano-region" mechanism. After the SPS samples were annealed, the "distorted nano-region" disappeared and better dielectric tunable properties were obtained. The dielectric constant was decreased to 1048, and the K value (Commutation Quality Factor) reached 7089. |
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