Nanodomain Engineered (K, Na)NbO3 Lead-Free Piezoceramics: Enhanced Thermal and Cycling Reliabilities

Fang-Zhou Yao, Ke Wang, Li-Qian Cheng, Xiaodan Zhang, Wei Zhang, Fangyuan Zhu, Jing-Feng Li

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The growing environmental concerns have been pushing the development of viable green alternatives for lead-based piezoceramics to be one of the priorities in functional ceramic materials. A polymorphic phase transition has been utilized to enhance piezoelectric properties of lead-free (K, Na)NbO3- based materials, accepting the drawbacks of high temperature and cycling instabilities. Here, we present that CaZrO3-modified (K, Na)NbO3 piezoceramics not only possess excellent performance at ambient conditions benefiting from nanodomain engineering, but also exhibit superior stability against temperature fluctuation and electrical fatigue cycling. It was found that the piezoelectric coefficient d33 is temperature independent under 4 kV/mm, which can be attributed to enhanced thermal stability of electric field engineered domain configuration; whereas the electric field induced strain exhibits excellent fatigue resistance up to 107 sesquipolar cycles. These findings render the current material an unprecedented opportunity for actuator applications demanding improved thermal and cycling reliabilities.
Original languageEnglish
JournalJournal of the American Ceramic Society
Volume98
Issue number2
Pages (from-to)448–454
ISSN0002-7820
DOIs
Publication statusPublished - 2015

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