MnO_2掺杂0.92[Bi_(0.5)(Na_(0.7)K_(0.25)Li_(0.05))_(0.5)]TiO_3-0.08Ba(Ti,Zr)O_3基无铅压电陶瓷

MnO_2-doped 0.92[Bi_(0.5)(Na_(0.7)K_(0.25)Li_(0.05))_(0.5) ]TiO_3-0.08Ba(Ti,Zr)O_3 Lead-free Piezoelectric Ceramics

采用二次合成法制备了新型0.92[Bi0.5(Na0.7K0.25Li0.05)0.5]TiO3-0.08Ba(Ti,Zr)O3+x(wt%)(质量分数)MnO2体系无铅压电陶瓷,研究了陶瓷的晶相结构、表面形貌、压电介电性能。研究结果表明,制备的陶瓷样品均具有单一钙钛矿结构。MnO2的含量为x=0.003时,得到介电损耗低的压电陶瓷:介质损耗tanδ为0.0361,压电常数d33为155pC/N,机电耦合系数kp为0.26,机械品质因素Qm为202;在1160℃,2h的烧结条件下,能够获得致密的无铅压电陶瓷体。

A new-type Lead-free piezoelectric ceramic 0. 92[Bi0.5（Na0.7K0.25Li0.05）0.5]TiO3-0.08Ba（Ti,Zr）O3 ＋ x （wt%） MnO2 was fabricated by a two-step sintering process. Crystalloid structure, surface images, piezoelectric and dielectric properties of the ceramics were studied. The results indicate that this system ceramics possess single perovskite structure . Lower loss tangent was obtained at x=0. 003. The main parameters for the composition of x=0. 003 are： tanδ= 0. 0361, d33：155pC/N, kp=0.21, Om ：202. The samples could be sintered densely at 1 160℃ for 2h in air.