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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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

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Title
Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na) NbO3 lead-free piezoceramics
Author
Jo, WookYao, Fang-ZhouPatterson, Eric AWang, KeRoedel, JuergenLi, Jing-Feng
Keywords
ZIRCONATE-TITANATE CERAMICS; UNIPOLAR FATIGUE; PIEZOELECTRIC PROPERTIES; ELECTRIC FATIGUE; TEMPERATURE; PZT; PERSPECTIVE; STABILITY; BEHAVIOR; PHASE
Issue Date
2014-06
Publisher
AMER INST PHYSICS
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/10162
DOI
10.1063/1.4884826
ISSN
0003-6951
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