Effect of microstructure on dielectric and fatigue strengths of BaTiO₃

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• 作者：Shih-Chun Lu ; Yin-Hua Chen ; Wei-Hsing Tuan ; Jay Shieh ; Chin-Yi Chen
• 关键词：Dielectric properties ; Fatigue ; Barium titanate ; Microstructure
• 刊名：Journal of the European Ceramic Society
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：30
• 期：12
• 页码：2569-2576
• 全文大小：2237 K

文摘

In the present study, bulk barium titanate ceramic specimens with bimodal microstructures are prepared and their dielectric and fatigue strengths under an alternating electric field are investigated. It is found that both the dielectric and fatigue strengths decrease with increasing amount of coarse grains. The scatter of the fatigue strength is characterized with the Weibull statistics. The extent of scatter of the fatigue strength data correlates strongly with the size distribution of the coarse grains. Such correlation is resulted from the presence of intrinsic defects within the microstructure. Direct microstructure evidences are provided.