Effect of HfO₂ content on the microstructure and piezoelectric properties of (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃ lead-free ceramics

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• 作者：Tao Chen ; Hongli Wang ; Ting Zhang ; Guangchang Wang ; Jifang Zhou ; Jianwei Zhang ; Yuhong Liu
• 关键词：Lead-free ceramics ; (Bi0.5Na0.5)0.94Ba0.06TiO3 ; HfO2 ; Piezoelectricity
• 刊名：Ceramics International
• 出版年：March, 2014
• 年：2014
• 卷：40
• 期：2
• 页码：2959-2963
• 全文大小：907 K

文摘

(Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃-xHfO₂ [BNBT-xHfO₂] lead-free ceramics were prepared using the conventional solid-state reaction method. Effects of HfO₂ content on their microstructures and electrical properties were systematically studied. A pure perovskite phase was observed in all the ceramics with x=0-0.07 wt%. Adding optimum HfO₂ content can induce dense microstructures and improve their piezoelectric properties, and a high depolarization temperature was also obtained. The ceramics with x=0.03 wt% possess optimum electrical properties (i.e., d₃₃~168 pC/N, k_p~32.1%, Q_m~130, 蔚_r~715, tan 未~0.026, and T_d~106 掳C, showing that HfO₂-modified BNBT ceramics are promising materials for piezoelectric applications.