用瑞利法研究掺la BiFeO3 - PbTiO3陶瓷的本征/外源压电贡献

2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2007-05-27 DOI:10.1109/ISAF.2007.4393278

T. Comyn, A. Bell

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引用次数: 5

摘要

BiFeO3 -PbTiO3 (BFPT)基材料由于极高的Tc(632℃)和自发应变>18%而受到高温压电材料的关注;这种高应变使得这些材料极难极。用小浓度的La掺杂可以制备d33 > 100 pm V-1的材料，同时保持Tc > 450℃。这里展示的是这些材料的瑞利分析结果，表明压电效应的外在贡献非常低，提供瑞利系数(alpha)在4.2和6.3倍10-18 m2V-2之间，大大低于在PZT中观察到的结果。与PZT和BiFeO3 -PbTiO3观测值的巨大偏差表明BFPT中存在相当大的畴壁锁定，这对该体系的压电活性有不利影响。

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Study of intrinsic / extrinsic piezoelectric contributions in La-doped BiFeO3 - PbTiO3 ceramics using the Rayleigh method

BiFeO₃ -PbTiO₃ (BFPT) based materials have received interest as high temperature piezoelectrics due to an extremely high Tc of 632degC, and a spontaneous strain >18%; this high strain makes these materials extremely difficult to pole. Doping with small concentrations of La allows materials to be prepared with a d₃₃ > 100 pm V^-1 whilst maintaining a T_c > 450degC. Presented here are results from a Rayleigh analysis of these materials which shows that the extrinsic contribution to the piezoelectric effect is extremely low, providing Rayleigh coefficients (alpha_d) between 4.2 and 6.3 times 10^-18 m²V^-2, considerably lower than that observed in PZT. The huge deviation from observations in PZT and BiFeO₃ -PbTiO₃ outline considerable domain wall locking in BFPT, which has a detrimental effect on the piezoelectric activity in this system.

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2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics

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