Influence of Ba2+ Segregation on Microstructures and Electrical Properties of (Na,Bi)1-xBaxTiO3 Lead-free Piezoceramics Near MPB

Jingchang Zhao, Zhenlai Zhou


(Na0.5Bi0.5)1-xBaxTiO3 (x=0.06, 0.07 and 0.10) lead free piezoelectric ceramics were fabricated to study their phase transition, microstructure and electrical properties near morphotropic phase boundaries. The obtained ceramics have the coexistence of tetragonal and rhombohedral phases at morphotropic phase boundaries, which is closely related to Ba2+ segregation during sintering. Meanwhile, morphologies and electrical properties of (Na0.5Bi0.5)1-xBaxTiO3 ceramics evidently change with Ba2+ content. Samples with high tetragonal phase content exhibited large dielectric constant and low coercive field. An optimized ratio of rhombohedral and tetragonal phases at morphotropic phase boundaries is beneficial to improving the piezoelectric properties of (Na0.5Bi0.5)1-xBaxTiO3 ceramics. Based on the results, the effect of Ba2+ segregation on microstructure and electrical properties of (Na0.5Bi0.5)1-xBaxTiO3 ceramics was discussed.


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