标题：Recent study progresses of (K,Na)NbO_3-based lead-free piezoelectric ceramics
作者：Zhang, J.L.;Zong, X.J.;Gao, Y.;Qing, Y.L.;Zhao, M.L.;Wang, C.L.
作者机构：[Zhang, J.L] School of Physics, Shandong University, Jinan 250100, China, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 更多
通讯作者地址：[Zhang, JL]Shandong Univ, Sch Phys, Jinan 250100, Peoples R China.
来源：Journal of optoelectronics and advanced materials
关键词：(K Na)NbO_3-based lead-free ceramics;Phase coexistence;Piezoelectric properties;Piezoelectric temperature stability
摘要：This paper outlines our recent study progresses on (K,Na)NbO _3-based lead-free piezoelectric ceramics. It has been found in (K_xNa_(1.x))NbO_3 ceramics that piezoelectric properties are almost irrelevant to the K/Na ratio within x=0.40 ～ 0.60 and orthorhombic phase possesses the much better piezoelectric temperature stability than tetragonal phase. Similar phenomena are also observed in some (K,Na,Li)(Nb,Ta)O_3 ceramics, of which (K_(0.55)Na _(0.45))_(0.965)L_(0.035)Nb_(0.80)Ta _(0.20)O_3ceramic shows particularly an outstanding piezoelectric performance with the piezoelectric properties of d_(33) =262 pC/N, k_p=0.53 and k_(33)=0.63 at room temperature and the weak temperature dependence of electromechanical coupling coefficients In the common usage temperature range. Furthermore, we have successfully obtained a remarkably high d_(33) value of 413 pC/N in (K_(0.45)Na _(0.55))Li_(0.22)(Nb_(0.77)Ta~(0.18)Li _(0.22)(Nb_(0.77)Ta_(0.18)Sb_(0.05))O _3ceramic through the conventional solid state reaction process.