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- Jo, Wook
- Sustainable Functional Ceramics Lab.
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Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na) NbO3 lead-free piezoceramics
- Author(s)
- Jo, Wook, Yao, Fang-Zhou, Patterson, Eric A, Wang, Ke, Roedel, Juergen, Li, Jing-Feng
- Issued Date
- 2014-06
- Citation
- APPLIED PHYSICS LETTERS, v.104, no.24, pp.1 - 5
- Abstract
- The bipolar fatigue behavior of (K,Na) NbO3 (KNN)-based lead-free piezoceramics was investigated. A comparative analysis demonstrated that CaZrO3-modified KNN ceramics exhibited highly enhanced bipolar fatigue resistance due to the reduced lattice distortion (c/a ratio) and coexistence of orthorhombic and tetragonal phases. The hypothesis was verified by systematical studies of cycle-dependent large and small signal parameters and micro-morphologies. It was identified that mechanical stress induced microstructure damage beneath the electrodes renders the KNN ceramics to be vulnerable to bipolar cycling; while the mild fatigue behavior for CaZrO3-modified ones mainly originates from a thermally reversible domain wall pinning.
- Publisher
- AMER INST PHYSICS
- ISSN
- 0003-6951
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