Effects of Bi³⁺ content and grain size on electrical properties of SrBi₂Ta₂O₉ ceramic

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• 作者：Hairui Liu^a ; Qiang Li^a ; ^{qiangli@mail.tsinghua.edu.cn} ; Jun Ma^b ; Xiangcheng Chu^c
• 关键词：SrBi2Ta2O9 ; Electrical properties ; Microstructure ; Grain size ; Ferroelectrics
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 June, 2012
• 卷：76
• 期：Complete
• 页码：21-24
• 文件大小：588 K

摘要

SrBi₂Ta₂O₉ ceramics with various excess Bi₂O₃ content were synthesized by conventional solid state method. The effects of excess Bi³⁺ content on structure and electrical properties were investigated. XRD analysis indicated that a typical bismuth layer polycrystalline structure was gained. Plate-like grains with different size were observed by SEM. With the occurrence of a liquid phase during sintering process, the excess Bi₂O₃ content greatly influenced densification and grain size of as-prepared ceramics, which determine microstructure and electrical properties of these samples to some extent. The results also found that the electrical properties were consistent with grain size. The sample with 5%excess Bi₂O₃ could exhibit a better hysteresis loop, with relative density and dielectric constant of about 96.8%and 149, respectively.