(Ba_(1-x)Ca_x)(Ti_(0.94)Zr_(0.056)Sn_(0.004))O_3无铅压电陶瓷电学性能和Curie温度的协同调控

Optimization of Electrical Properties and Curie Temperature of(Ba_(1-x)Ca_x)(Ti_(0.94)Zr_(0.056)Sn_(0.004))O_3 Lead-free Piezoelectric Ceramics

在A位和B位同时分别加入Ca^(2+)、Zr^(4+)和Sn^(4+),采用传统的固相烧结法在1 480℃烧结4 h制备了(Ba_(1-x)Ca_x(Ti_(0.94)Zr_(0.056)Sn_(0.004))O_3(BC_xTZS)压电陶瓷。研究了Ca^(2+)含量x对BC_xTZS陶瓷微观形貌、相结构和电学性能的影响。结果表明:少量Ca^(2+)有利于晶粒长大,x=0.05的样品具有最大的晶粒尺寸12.88μm,Ca^(2+)、Zr^(4+)和Sn^(4+)全部固溶到BaTiO_3晶格中形成单一固溶体。当0.00≤x≤0.03时,BC_xTZS陶瓷的室温相结构为正交相(O)-四方相(T)两相共存;x=0.05时,O-菱方相(R)-T三相共存;x=0.07时,O相消失,R-T两相共存。所有样品具有较高的Curie温度(T_C>104℃)和良好的电学性能(d_(33)=325 pC/N、k_p=34%、Q_m=151),实现了电学性能和Curie温度的协同调控。

Abstract： In this paper, Ca^2＋, Zr^4＋ and Sn^4＋ were simultaneously doped at A-sites and B-sites, respectively.（Ba（1-x）Cax）（Ti（0.94）Zr（0.056）Sn（0.004））O3 （BCxTZS） lead-free piezoelectric ceramics were fabricated by conventional solid-state sintering at 1 480℃ for 4 h. The effect of Ca^2＋ content （x） on the microstructure, phase structure and electrical properties were investigated. The results show that a small amount of Ca^2＋ is conducive to the grain growth, in which a greater grain size of 12.88μm is attained as x=0.05. Ca^2＋, Sn^4＋ and Zr4＋ ions completely diffuse into the BaTiO3 lattice to form a single solid solution. The phase structure is orthorhombic （O） -tetragonal （7） coexisted structure as 0.00≤x≤0.03, O-rhombohedral（R） -T multiphase coexisted structure as x-=0.05, and R-T coexisted structure as x=0.07, respectively. All the samples possess a high Curie temperature （i.e., Tc〉104℃）, along with the better piezoelectric properties （i.e., d33=325 pC/N, kp=34%, Qm=l 51） as x=0.05, improving the electrical properties and the Curie temperature.