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中文摘要：
以传统固相法制备了（1-x）Li0.04Na0.52K0.44Nb0.86Ta0.10Sb0.04O3-xBaCu0.5W0.5O3[简称（1-x）LF4-xBCW]无铅压电陶瓷,研究了不同BCW掺杂量（x=0%,0.1%,0.2%,0.5%,1%,摩尔分数）对LF4陶瓷的显微结构和电性能的影响。结果表明：引入BCW后,材料仍为钙钛矿结构,当x≥1%时,样品由四方相向正交相转变,出现To-t,Tc则随BCW掺入量的增加向低温区移动。BCW掺杂量对LF4的电性能起到＂硬性＂掺杂作用,其压电常数d33,平面机电耦合系数kp,介电损耗tanδ和介电常数εr均随着BCW含量的增加而降低,而机械品质因素Qm整体提高。此外,BCW的掺入降低了陶瓷的烧结温度并提高了其密度。
英文摘要：
Lead-free（1-x） Li0.04Na0.52K0.44Nb0.86Ta0.10Sb0.04O3-xBaCu0.5W0.5O3 [（1-x）LF4-xBCW] piezoelectric ceramics have been fabricated by the traditional solid state reaction.The microstructure and electrical properties of LF4 ceramics with different BCW content（x = 0%,0.1%,0.25%,0.5%,1%,in mole） are investigated.The results show that KNN ceramics still have the perovskite structure after being doped with BCW.The structure of samples has changed from tetragonal to orthorhombic when x≥1%,To-t can be detected,and Tc shifts to lower temperature.The modification of BCW doping hardened this material with lower kp,tanδ,d33 and remarkably higher Qm than pure LF4 ceramics.Furthermore,the sintering temperature of LF4 ceramics decreases and the density increases evidently with the increase of BCW content.
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