标题：Remarkably Strong Piezoelectricity of Lead-Free (K_(0.45)Na_(0.55))_(0.98)Li_(0.02)(Nb_(0.77)Ta_(0.18)Sb_(0.05))O_3 Ceramic
作者：Yong Gao;Jialiang Zhang;Yalin Qing
作者机构：[Gao, Y] School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;[ Zhang, J] School of Physics, State K 更多
通讯作者地址：[Zhang, JL]Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
来源：Journal of the American Ceramic Society
摘要：Various lead-free (K_xNa_(1-x))_(0.98)Li_(0.02)(Nb_(0.82-y)Ta_(0.18)Sb_y)O_3 ceramics with x = 0.50, y = 0.00-0.07 or x = 0.40-0.60, y = 0.05 were prepared by the conventional solid-state reaction method. Systematic investigation on the microstructures, crystalline structures, and dielectric and piezoelectric properties was carried out. Remarkably strong piezoelectricity has been achieved in (K_(0.45)Na_(0.55))_(0.98)Li_(0.02)(Nb_(0.77)Ta_(0.18)Sb_(0.05))O_3 ceramic, which shows the excellent piezoelectric properties of d_(33) = 413 pC/N, d_(31) = -153 pC/N, k_p = 0.50, and k_(33) = 0.62. It is considered that the observed strong piezoelectricity should be ascribed to several combined decisive factors, such as the phase coexistence due to an orthorhombic-tetragonal polymorphic phase transition near room temperature, the high electronegativity of Sb~(5+) ions as compared with those of Nb~(5+) ions and Ta~(5+) ions, and the relatively ideal microstructure with high density, large average grain size and narrow grain-size distribution.