Effects of Bi₄Ti₃O₁₂ addition on the microstructure and dielectric properties of modified BaTiO₃ under a reducing atmosphere

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• 作者：T.A. Jain ; C.C. Chen ; K.Z. Fung
• 关键词：Grain growth ; Electron microscopy ; Dielectric properties ; BaTiO₃
• 刊名：Journal of the European Ceramic Society
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：29
• 期：12
• 页码：2595-2601
• 全文大小：958 K

文摘

The effects of Bi₄Ti₃O₁₂ addition on the microstructure and dielectric properties of Mn-modified BaTiO₃ were investigated to develop low temperature fired BaTiO₃-based ceramics with stable temperature characteristics. The sintering temperature of Mn-doped BaTiO₃ could be reduced to 1200 °C by adding more than 1 mol % Bi₄Ti₃O₁₂. TEM results show an apparent core–shell structure with 2 mol % Bi₄Ti₃O₁₂ addition. However, it was destroyed when the Bi₄Ti₃O₁₂ content increased from 2 to 4 mol % . The permittivity decreased and the Curie temperature shifted to higher temperature when the Bi₄Ti₃O₁₂ content increased from 0 to 3 mol % . The temperature characteristic of capacitance was very close to the EIA X8R specification when 2 mol % Bi₄Ti₃O₁₂ was added due to the presence of the core–shell grain structure and raised Curie temperature. With adequate Bi₄Ti₃O₁₂ addition, the BaTiO₃-based system shows great potential for applications in EIA X8R-type multilayer ceramic capacitors.