Abstract
采用传统固相烧结法制备了0.7BiFeO3-0.3BaTiO3-xBi2O3(0≤x≤0.05)无铅压电陶瓷, 研究了Bi补偿量x和冷却方式对其相结构、微观形貌和综合电学性能的影响。结果表明：所有样品均为菱方相(R)和伪立方相(PC)两相共存, 0≤x≤0.01样品为纯的钙钛矿结构, 且x=0.01样品的两相比例CR/CPC接近1; x>0.01样品中出现富Bi杂相Bi25FeO40。与冷却方式相比, 优化Bi补偿量更有利于提升BFBT-xBi2O3陶瓷的压电性能。随着x增大, d33先增大后减小, 在x=0.01时获得最优值。由于较小的晶粒、较合适的CR/CPC以及较大的残余应变, 水冷BFBT-0.01Bi2O3陶瓷获得了最优的压电性能(d33水冷=141 pC/N、kp=27%)和高TC=507℃。研究结果表明, BFBT基陶瓷有希望成为兼具高压电性能和高TC的无铅压电材料体系之一。
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