High Strain in (K,Na)NbO3 -Based Lead-Free Piezoceramics

A high strain is important for practical applications of piezoelectric actuators. Here we reported a high strain in the (K,Na)­NbO3 -based ceramics by doping alkaline earths or transition metals. The ceramics possess a high strain (∼0.29%) as well as a large converse piezoelectric coefficient (d33*)...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2014-11, Vol.6 (22), p.20358-20364
Main Authors: Tao, Hong, Wu, Jiagang, Xiao, Dingquan, Zhu, Jianguo, Wang, Xiangjian, Lou, Xiaojie
Format: Article
Language:English
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Summary:A high strain is important for practical applications of piezoelectric actuators. Here we reported a high strain in the (K,Na)­NbO3 -based ceramics by doping alkaline earths or transition metals. The ceramics possess a high strain (∼0.29%) as well as a large converse piezoelectric coefficient (d33*) up to 688 pm/V, which almost matches that of PZT4 ceramics. The obtained d 33* is high for nontextured (K,Na)­NbO3-based ceramics. In addition, a higher d 33 value (340–407 pC/N) was also attained in the ceramics. Enhanced d 33 and d 33* values of this work should be attributed to the multiphase coexistence’s effect induced by alkaline earths or transition metals. We believe that our research can benefit the developments of (K,Na)­NbO3 ceramics and widen their applications range.
ISSN:1944-8244
1944-8252
DOI:10.1021/am505887y