高压电常数(Ba_(0.85)Ca_(0.15))(Ti_(0.9)Zr_(0.1-x)Sn_x)O_3陶瓷结构与性能研究

Structure and Properties of (Ba_(0.85)Ca_(0.15))(Ti_(0.9)Zr_(0.1-x)Sn_x)O_3 Lead-free Ceramics with High Piezoelectric Constant

采用传统固相法制备了（Ba0.85Ca0.15）（Ti0.9Zr0.1-xSnx）O3 （CBTZS-x）无铅压电陶瓷, 研究了不同Sn含量（x=0~0.1）对CBTZS-x陶瓷相结构、介电以及压电性能的影响。实验结果表明： 所有样品均为纯钙钛矿结构; 随着Sn含量增加, 室温下样品逐渐由三方和四方相共存结构转变为四方相结构, 且三方-四方相转变温度TR-T和居里温度TC均逐渐减小, 当x=0.04时, TR-T更接近于室温, 此时表现出优异的压电性能; 样品的剩余极化强度Pr和矫顽场Ec随着x增加均呈现出减小的趋势, 而相对介电常数εr则逐渐增大。当x=0.04时, CBTZS-x材料的综合性能最佳： d33=665 pC/N, kp=55.6%, εr=4520, Pr=12.5 μC/cm2, Ec=1.6 kV/cm, 表明该陶瓷材料具有很好的应用前景。

Lead-free piezoelectric ceramics （Ba0.85Ca0.15）（Ti0.9Zr0.1-xSnx）O3（CBTZS-x） were prepared by the traditional solid state reaction. Phase structure, dielectric and piezoelectric properties for CBTZS-x samples with different Sn contents were investigated. It is found that all samples have a pure perovskite phase structure. With Sn content increase, the phase structure of CBTZS-x changes from coexistence of rhombohedral and tetragonal phase to tetragonal structure near room temperature. The phase change temperature of rhombohedral to tetragonal （TR-T） and Curie temperature （TC） shift towards lower temperature. When x=0.04, the TR-T is more close to room temperature, which shows excellent piezoelectric properties. The remnant polarization Pr and coercive field Ec are reduced, while dielectric constant εr is improved by the modification of Sn. The CBTZS-x ceramic with x=0.04 exhibits the optimal properties： d33=665 pC/N, kp=55.6%, εr=4520, Pr=12.5 μC/cm2 and Ec=1.6 kV/cm, which indicates that the CBTZS ceramic has a good application prospect.