High-frequency dielectric properties of BSTO ceramic prepared with hydrothermal synthesized SrTiO_3 and BaTiO_3 powders

作     者：Yonghui Xing Hui Liang Xiaolei Li Liuqi Si 

作者机构：Key LaboratoryforAdvanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 China Shandong Sinocera Functional Material Co. Ltd.. Shandong Dongying 257091 China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2009年第7卷第5期

页      面：414-418页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：support from the Shan-dong Sinocera Functional Material Co.  Ltd 

主　　题：Hydrothermal method SrTiO3 BaTiO3 Dielectric properties 

摘      要：BSTO dielectric ceramic was prepared from SrTi03 and BaTi03 powders synthesized by hydrothermal method, as well as from ***.4TiO3 powder synthesized by conventional solid-state reaction. The former can be sintered at a relatively low temperature of 1120 ℃. Characterization by SEM showed that the grain shapes of both ceramics are cubical, though the grain size of the former is much smaller. Dielectric constants measured at 20℃ were shown to vary with frequency in the range from I kHz to 2 MHz and dc bias field, and further that the dielectric loss of the former to be less than 2 × 10^- 3 in the frequency range of 20 kHz to 1 MHz, much smaller than that of the latter sample. For the former, temperature dependence of dielectric constant is much flatter and there exists an extended phase transition diffusion covering a wide temperature range of Curie temperature To. The smaller grain size of the former depresses the dc bias electrical field dependence of dielectric constant. The tunability is 7% under a bias field of 0.6 kV/mm dc.