Microstructure, dielectric and piezoelectric properties of lead-free Bi0.5Na0.5TiO3−Bi0.5K0.5TiO3−BiMnO3 ceramics

Bulletin of materials science

Xu Shan²  Jun Cheng²  Changrong Zhou²  Huabin Yang²  Weizhou Li¹  Qin Zhou² 

[1] School of Materials Science and Engineering, Guangxi University, Nanning, Guangxi 530004, People’s Republic of China$$School of Materials Science and Engineering, Guangxi University, Nanning, Guangxi 530004, People’s Republic of ChinaSchool of Materials Science and Engineering, Guangxi University, Nanning, Guangxi 530004, People’s Republic of China$$;School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi 541004, People’s Republic of China$$School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi 541004, People’s Republic of ChinaSchool of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi 541004, People’s Republic of China$$

关键词: Piezoelectricity;    perovskites;    electroceramic;    electrical properties.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

To improve the piezoelectric properties of Bi_0.5Na_0.5TiO₃-based ceramics, a new perovskite-type leadfree piezoelectric (1 â€�?? ð‘�? â€�?? ð‘�?)Bi_0.5Na_0.5TiO₃−ð�?�¥Bi_0.5K_0.5TiO₃−ð�?�¦BiMnO₃ system has been fabricated by a conventional solidâ€�?�state reaction method and their microstructure, dielectric and piezoelectric properties have been investigated. The results of X-ray diffraction (XRD) analysis reveal that the addition of small amounts of BiMnO₃ did not cause a remarkable change in crystal structure, but resulted in an evident evolution inmicrostructure. An obvious secondary phase was observed in samples with high Bi_0.5K_0.5TiO₃ content. It is found from dielectric constant curves that low-temperature hump disappeared with increasing y and it appeared again with increasing x. The piezoelectric properties significantly increase with increasing Bi_0.5K_0.5TiO₃ and BiMnO₃ content. The piezoelectric constant and electromechanical coupling factor attain maximum values of ð‘�??₃₃ = 182 pC/N at ð‘�? = 0.21(ð‘�? = 0.01) and ð‘�?_p = 0.333 at ð‘�? = 0.18 (ð‘�? = 0.01), respectively.

【 授权许可】

Unknown