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Large Strain Response in <001> Textured 0.79 BNT –0.20 BKT –0.01 NKN Lead‐Free Piezoelectric Ceramics
Author(s) -
Ye Chenggen,
Hao Jigong,
Shen Bo,
Zhai Jiwei
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05353.x
Subject(s) - materials science , microstructure , ceramic , piezoelectricity , texture (cosmology) , composite material , ferroelectricity , grain size , mineralogy , chemistry , optoelectronics , image (mathematics) , artificial intelligence , computer science , dielectric
Templated grain growth ( TGG ) method was applied to fabricate textured lead‐free piezoelectric ceramics 0.79 Bi 0.5 Na 0.5 TiO 3 –0.20 Bi 0.5 K 0.5 TiO 3 –0.01 Na 0.5 K 0.5 NbO 3 (0.79 BNT –0.20 BKT –0.01 NKN ) using plate‐like Bi 4 Ti 3 O 12 ( BiT ) grains, to improve its performances. Relationships between degree of orientation, microstructure, and piezoelectric properties of the textured ceramics were studied. Results showed that dense, c ‐axis (00 l ) textured 0.79 BNT –0.20 BKT –0.01 NKN ceramics, with brick wall cross‐sectional microstructures and strip‐like grains aligned parallel to the tape casting direction, were obtained using this method. The highest degree of orientation (Lotgering factor f = 94%) was achieved in samples with template content of 20 wt%. However, these samples did not exhibit enhanced strain response due to the composition deviation induced by the interdiffusion of BiT into the matrix composition. Instead, maximum strain value of 0.45% was observed in the textured sample with 5 wt% template, which was 50% higher than that of random ceramics and comparable with some PZT ‐based anti‐ferroelectric ceramics, suggesting the textured ceramics could be a very promising lead‐free piezoelectric material for application in electromechanical devices.