Microstructure and electrical properties of Mn/Y codoped Ba_0.67Sr_0.33TiO₃ ceramics

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• 作者：Dongxu Yan^a ; ^b ; Zunping Xu^a ; Xiaolong Chen^a ; Dingquan Xiao^a ; Ping Yu^a ; Jianguo Zhu^a ; ^{nic0400@scu.edu.cn} ; ^{joyner68@sina.com}
• 关键词：C. Dielectric properties ; BST ; Ceramics ; Ion substitution ; Codoping
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：May, 2012
• 卷：38
• 期：4
• 页码：2785-2791
• 文件大小：1428 K

摘要

Pure and Mn/Y codoped Ba_0.67Sr_0.33TiO₃ (BST) ceramics were fabricated via the citrate-nitrate combustion technique, and the microstructure and electrical properties of BST ceramics were mainly investigated. The Mn/Y codoping concentration has a strong influence on the microstructure and electrical properties of BST ceramics. All BST ceramics possess a pure polycrystalline structure. The density, dielectric loss, leakage current, and ferroelectric properties are improved by codoping 0.5 mol%Mn and 1.0 mol%Y to BST. The relative density of 0.5 mol%Mn/1.0 mol%Y-codoped BST (BST0510) ceramics reaches 97.5%of the theoretical value. BST0510 ceramics have the lowest dielectric loss (tan未 < 0.0073 at 1 kHz) among all BST ceramics. BST0510 ceramics also demonstrate a low leakage current density (1.23 脳 10^鈭? A/cm²) at an applied field of 10 kV/cm, and excellent ferroelectric properties with a remanent polarization of 2P_r = 15.327 渭C/cm² and a coercive field of 2E_c = 3.456 kV/cm. Therefore, the Mn and Y with optimum content help improve the electrical properties of BST materials.