Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na) NbO3 lead-free piezoceramics
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- Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na) NbO3 lead-free piezoceramics
- Jo, Wook; Yao, Fang-Zhou; Patterson, Eric A; Wang, Ke; Roedel, Juergen; Li, Jing-Feng
- ZIRCONATE-TITANATE CERAMICS; UNIPOLAR FATIGUE; PIEZOELECTRIC PROPERTIES; ELECTRIC FATIGUE; TEMPERATURE; PZT; PERSPECTIVE; STABILITY; BEHAVIOR; PHASE
- Issue Date
- AMER INST PHYSICS
- APPLIED PHYSICS LETTERS, v.104, no.24, pp.1 - 5
- 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.
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