Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na)NbO3 lead-free piezoceramics | Zendy

FangZhou Yao | Zendy; Eric A. Patterson | Zendy; Ke Wang | Zendy; Wook Jo | Zendy; Jürgen Rödel | Zendy; JingFeng Li | Zendy

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Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na)NbO3 lead-free piezoceramics

Author(s) -

FangZhou Yao,

Eric A. Patterson,

Ke Wang,

Wook Jo,

Jürgen Rödel,

JingFeng Li

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4884826

Subject(s) - materials science , tetragonal crystal system , orthorhombic crystal system , microstructure , ceramic , composite material , lead (geology) , stress (linguistics) , electrode , crystal structure , crystallography , chemistry , linguistics , philosophy , geomorphology , geology

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.open8

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