Structure and properties of (1−x)[(K$_{0.5}$Na$_{0.5}$)NbO$_3$�?�LiSbO$_3$]�?? xBiFe$_{0.8}$Co$_{0.2}$O$_3$ lead-free piezoelectric ceramics

Bulletin of materials science

XIA ZHAI¹  HUA WANG¹  XIAYAN ZHAO¹  LING YANG¹  JIWEN XU¹ 

[1] School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China$$School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, ChinaSchool of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China$$

关键词: Piezoelectric ceramics;    KNNâ€�?�LS;    BFC-doping;    properties.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Lead-free piezoelectric ceramics $(1−x)$[0.95(K$_{0.5}$Na$_{0.5}$)NbO$_3$�??0.05LiSbO$_3$]�??$x$BiFe$_{0.8}$Co$_{0.2}$O$_{3}$(KNN�?�LS�??$x$BFC) were prepared by a conventional sintering technique. The effect of BFC content on the structure, piezoelectricand electrical properties of KNN�?�LS ceramics was investigated. The results reveal that the BFC is effective in promoting the sinterability and the electrical properties of the ceramics sintering at low temperature of 1030$^{circ}$C. Theceramics show a single perovskite structure, in which the tetragonal phase decreases while the orthorhombic phase increases with the increase of $x$. The more the BFC content is, the smaller and homogeneous grains were formed.With the increase of $x$, the $d_{33}$ and the $k_p$ increase to a maximum value and then slightly decrease, but the $Q_m$ increases continuously. As BFC content increases, the Curie temperature $T_c$ and remnant polarization $P_r$ decrease, but the diffusivity of phase transition in KNN�?�LS ceramics will intensify and the coercive field $E_c$ fluctuate between 1.16 and 1.51 kV mm$^{�?1}$. The samples with $x =0.004$ exhibit optimum electrical properties at room temperature ($d_{33} = 268 pC$ N$^{�?1}$, $k_p =52$%, $epsilon_r = 1366$, $an delta =2.11$%, $T_c = 325^{circ}$C, $P_r = 20.4$ $mu$C cm$^{�?2}$, $E_c =1.16$ kV mm$^{�?1}$).

【 授权许可】

Unknown