Influences of protective atmosphere on the characterization and properties of NaSr2Nb5O15 lead-free piezoelectric ceramics by sol�?�gel method

Bulletin of materials science

Jin-Qiu Zhao¹  Tian-Hang Zhang¹  Yan-Gai Liu¹  Ming-Hao Fang¹  Zhao-Hui Huang¹ 

[1] School of Materials Sciences and Technology, China University of Geosciences (Beijing), Beijing 100083, China$$School of Materials Sciences and Technology, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Materials Sciences and Technology, China University of Geosciences (Beijing), Beijing 100083, China$$

关键词: Solâ€�?�gel processes;    protective atmosphere;    dielectrics;    ferroelectrics;    piezoelectrics.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

NaSr₂Nb₅O₁₅ lead-free piezoelectric ceramics were prepared by the solâ€�?�gel method; they were sintered at different temperatures with or without protective atmosphere. The influences of sintering temperature and protective atmosphere on the characterization and properties of the ceramics were investigated. All the ceramics showed the pure tungsten bronze structure and an intermediate relaxor-like behaviour between normal and ideal relaxor ferroelectrics according to the modified Curieâ€�?�Weiss law. The sintering temperature affected significantly the properties of ceramics, with the sintering temperature increased both with and without protective atmosphere, the ðœ�?_r, ð‘�??₃₃, 𝐾_p and ð‘�?_r of these ceramics initially increased and decreased finally, whereas the variation of ð‘�??_m and 𝐸_c showed the opposite tendency. Furthermore, the protective atmosphere also significantly affected the properties of these ceramics, ðœ�?_r, ð‘�??₃₃, 𝐾_p and ð‘�?_r of such ceramics sintered with protective atmosphere were superior to those of the ceramics sintered without protective atmosphere, while the tan ð›�?, ð‘�??_m and 𝐸_c gave the contrary results.

【 授权许可】

Unknown