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中文摘要：
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。
英文摘要：
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.
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