(Ba_(0.85)Ca_(0.15))(Ti_(0.9)Zr_(0.1–x)Sn_(x))O_(3)无铅压电陶瓷的相结构与压电性能

Phase Structure and Piezoelectric Property of(Ba_(0.85)Ca_(0.15))(Ti_(0.9)Zr_(0.1–x)Sn_(x))O_(3) Lead-free Piezoceramics

钙锆共掺钛酸钡陶瓷(BCZT)具有优异的介电性能和压电性能,是一类具有发展潜力的无铅压电陶瓷,但其压电性能仍无法与铅基陶瓷媲美。为提高压电性能,本研究对陶瓷材料进行Sn元素掺杂改性((Ba_(0.85)Ca_(0.15))-(Ti_(0.9)Zr_(0.1–x)Sn_(x))O_(3),x=0.02~0.07))。晶体结构分析证实所有组分的陶瓷无杂相,处于正交相与四方相两相共存状态,并具有较大的c/a;显微结构分析发现所有陶瓷都很致密,且平均晶粒尺寸随着Sn含量的增加而增大。当x=0.04时,陶瓷最致密,且室温处于准同型相界附近,因此拥有最佳的电学性能:d_(33)=590p C·N^(–1),k_(p)=52.2%,tanδ=0.016,ε_(33)^(T)=5372,d_(33)^(*)=734pm·V^(–1),IR=57.8GΩ·cm。本研究表明:Sn掺杂的BCZT基无铅压电陶瓷具有优异的压电性能,有望在换能器、机电传感器和驱动器等方面得到应用。

Zr and Ca co-doped brium titanate(BCTZ) based ceramics have attracted much attention due to their excellent dielectric and piezoelectric properties, which are potential candidates for lead-free piezoelectric materials.However, the piezoelectric property of BCTZ-based ceramics are still lower than that of commercial lead-based ceramics. Therefore, Sn elements are doped in(Ba_(0.85)Ca_(0.15))(Ti_(0.9)Zr_(0.1–x)Sn_(x))O_(3)(x = 0.02-0.07) ceramics to improve their piezoelectric property in this work. First, all ceramics exhibit a pure perovskite structure without any secondary phase.Furthermore, orthorhombic and tetragonal phases coexist at room temperature for all counterparts. Second, all ceramics display a dense microstructure. And the grain size gradually increases with Sn content increasing. The crystal structure of x=0.04 ceramic locates in morphotropic phase boundary. Meanwhile, the x=0.04 ceramic exhibits the most dense microstructure. Hence, x=0.04 ceramic has the best piezoelectric property with d_(33)=590p C·N^(-1),k_(p)=52.2%,tanδ=0.016,ε_(33)^(T)=5372,d_(33)^(*)=734pm·V^(-1),and IR=57.8GΩ·cm. This work demonstrates that the Sn-doped BCZT based lead-free piezoelectric ceramics could be applied in transducers, electromechanical sensors and actuators.