科研之友
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摘要
In this study, we report the electrical performance and structure of Li and Mn codoped Aurivillius type solid solution ceramics with a composition (CaBi)(1-x)(LiMn)(x)Bi6NbTi5O24 (x=0-0.04) sintered under different temperatures. The results indicate that single phase structure with a lattice similar to that of the end member CaBi4Ti4O15 could be formed in a wide sintering temperature range for all the compositions investigated. All composite samples show piezoelectric constant values about 2-3 times of that of the designed constituent phase CaBi4Ti4O15 and Bi3TiNbO9. Interestingly, the samples sintered under a relatively low temperature around 960 degrees C showed the highest d(33) and best temperature stability of piezoelectricity. This was attributed to a suppressed Bi evaporation. The results indicated that formation of compound or solid solution system was an effective way in improving the piezoelectric performance. Although a relatively lower Curie temperature (T-c) compared to that of the single phase end member was obtained in the compound system, all the samples still showed a depolarization temperature higher than 500 degrees C, while the temperature stability below T-c seems to be an issue deserving further investigation.
- 出版日期2017-7-1
- 单位中国科学院声学研究所; 北京市理化分析测试中心; 北京航空航天大学
