Dielectric properties and microstructures of Ta-doped BaTiO₃–(Bi_0.5Na_0.5)TiO₃ ceramics for X9R applications

详细信息    查看全文

• 作者：Zhengbo Shen ; Xiaohui Wang ; Longtu Li
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：28
• 期：4
• 页码：3768-3773
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1573-482X
• 卷排序：28

文摘

Ta-doped 0.90BaTiO₃–0.10(Bi_0.5Na_0.5)TiO₃ ceramics were successfully prepared by conventional solid-state reaction method and studied to satisfy super-broad temperature stability. The effects of Ta₂O₅ doping on the dielectric properties and microstructures were thoroughly investigated. Ta plays an important role in the formation of core–shell structure because of chemical inhomogeneity, which gives rise to the weak temperature dependence of dielectric properties. The samples with the additon of 1.5 mol% Ta₂O₅ satisfy the X9R specification, exhibiting an optimum dielectric behavior of ε_r ~ 2100, tanδ ~ 1.6% at room temperature, which is a promising candidate material for X9R MLCC applications.