Effects of Sn on the microstructure and dielectric properties in BaTiO₃-based ceramics

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• 作者：Jing Wang^a ; ^b ; ^{jslhust@gmail.com} ; Shenglin Jiang^a ; Dan Jiang^b ; Tingwei Wang^b ; Hao Yao^b
• 关键词：Barium titanate ; Ceramic matrix composites ; Chemical inhomogeneity ; Dielectric materials
• 刊名：Ceramics International
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：39
• 期：4
• 页码：3657-3662
• 全文大小：936 K

文摘

Ba_0.985Bi_0.01TiO₃-BaTi_1?xSn_xO₃ powders were synthesized by a two-step soft chemical method. Ceramics with core-shell structure could be easily obtained by using these uniformly distributed powders. The ceramics not only satisfied the requirement of EIA-X8R specification, but also were near to that of EIA-X9R specification. Microstructural evaluation conducted by X-ray diffraction and scanning electron microscopy confirmed the hierarchical structure of the ceramic grains. The shape of the ¦Å-T curves near the dielectric peak became broad when x increased from 0.001 to 0.02. The permittivity of Ba_0.985Bi_0.01TiO₃-BaTi_0.98Sn_0.02O₃ ceramic was ¡«23,000, ¦¤C/C_20 ¡ãC was ?15 % , 14.4 % and ?15 % at ?55 ¡ãC, 120 ¡ãC and 170 ¡ãC, respectively, and the dielectric loss was 0.5. The results showed that the content of Sn had a strong impact on the diffusion and the dielectric properties of the ceramics.