BiFeO_3掺杂改性铌酸钾钠无铅压电陶瓷  

LEAD-FREE PIEZOELECTRIC CERAMICS K_(0.5)Na_(0.5)NbO_3 MODIFIED BY DOPING-BiFeO_3

作　　者：江向平[1] 余祖灯[1] 杨庆[1] 陈超[1] 涂娜[1] 李月明[1] 

机构地区：[1]景德镇陶瓷学院材料科学系,江西景德镇333001

出　　处：《硅酸盐学报》2010年第5期788-792,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50862005;50962007);教育部新世纪优秀人才支持计划(NCET–06–0576);江西省自然科学基金(2009GZC0063;2009GQC0065);江西省对外科技合作项目(赣财教[2008]212);江西省高等学校"先进陶瓷材料"科技创新团队资助项目

摘　　要：采用传统固相法制备了(1–x)(K0.5Na0.5)NbO3-xBiFeO3[(1–x)KNN-xBF]无铅压电陶瓷,研究了不同BF含量(x=0,0.175%,0.5%,1%,2%,3%,摩尔分数)样品的物相组成、显微结构及电性能。结果表明:当x≤3%时,得到了纯钙钛矿结构的(1–x)KNN-xBF陶瓷。与纯KNN相比,在0<x≤1%时,(1–x)KNN-xBF样品的密度(ρ)、压电常数(d33)、平面机电耦合系数(kp)和机械品质因子(Qm)都显著增大;当1%<x≤3%时,ρ,d33,kp和Qm又迅速降低;在x=1%时达到最大值。x=1%时,(1-x)KNN–xBF材料的综合性能最好,其中ρ=4.42g/cm3,d33=172pC/N,kp=0.45,介电损耗tanδ=0.021,相对介电常数εr=759和Qm=138;同时表现出较好的抗老化性能。Lead-free piezoelectric ceramics （1-x）（K0.5Na0.5）NbO3-xBiFeO3 [（1–x）KNN-xBF] were prepared by the traditional solid state reaction. The phase composition, microstructure and electrical properties for （1-x）KNN-xBF samples with different BF content （x = 0, 0.175%, 0.5%, 1%, 2%, 3%,in mole） were investigated. The results show that all the （1-x）KNN-xBF ceramics prepared when x≤3% possess the pure perovskite structure. Compared with the pure KNN, the density ρ, piezoelectric constant d33, planar electro-mechanical coupling coefficient kp and mechanical quality factor Qm of the （1-x）KNN-xBF ceramics increase evidently at 0x≤1%, and then decrease promptly at 1%x≤3%. Especially, the optimum electrical properties （ρ = 4.42 g/cm3, d33 = 172 pC/N, kp = 0.45, dielectric loss tan δ = 0.021, relative permittivity εr = 759 and Qm = 138） can be obtained with the composition of x = 1%, which also exhibits good aging characteristics.

关 键 词：铁酸铋 铌酸钾钠 无铅压电陶瓷 压电性能 老化性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]