Effects of Nb doping on the microstructure, ferroelectric and piezoelectric properties of 0.7BiFeO$_3$�??0.3BaTiO$_3$ lead-free ceramics

Bulletin of materials science

LINGLING LUO¹  XIAOLAN WU¹  QIAOJI ZHENG¹  XIAOCHUN WU¹  NA JIANG¹ 

[1] College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China$$College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, ChinaCollege of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, China$$

关键词: Lead-free ceramics;    BiFeO$_3$â€�?�BaTiO$_3$;    ferroelectric properties;    piezoelectric properties.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Donor-doped lead-free Bi$_{0.7}$Ba$_{0.3}$(Fe$_{0.7}$Ti$_{0.3}$)$_{1−x}$Nb$_{0.66x}$O$_{3}$ + 1 mol% MnO$_2$ ceramics were prepared by a conventional oxide-mixed method and the effects of Nb-doping on microstructure, piezoelectric and ferroelectricproperties of the ceramics were investigated. All the ceramics exhibit a pure perovskite structure with rhombohedral symmetry. The grain growth of the ceramics is inhibited after the addition of Nb doping. High electricinsulation ($R = 10^9�??10^{10}$ $Omega$·cm) and the poor piezoelectric performance and weak ferroelectricity are observed after the addition of Nb$_2$O$_5$ in the ceramics. Different from the donor effect of Pb-based perovskite ceramics, the introduction of Nb into 0.7BiFeO$_3$�??0.3BaTiO$_3$ degrades the piezoelectricity and ferroelectricity of the ceramics. The Bi$_{0.7}$Ba$_{0.3}$(Fe$_{0.7}$Ti$_{0.3}$)$_{1−x}$Nb$_{0.66}$xO$_3$ + 1 mol% MnO2 ceramic with $x = 0$ exhibits the optimum piezoelectric properties with $d_{33} = 133$ pN C$^{�?1}$ and $k_p = 0.29$ and high Curie temperature ($T_C = 603^{circ}$C).

【 授权许可】

Unknown