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

Yao, Fang-Zhou and Patterson, Eric A. and Wang, Ke and Jo, Wook and Rödel, Jürgen and Li, Jing-Feng (2014):
Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na)NbO3 lead-free piezoceramics.
In: Applied Physics Letters, pp. 242912(1-5), 104, (24), ISSN 0003-6951, [Online-Edition: http://dx.doi.org/10.1063/1.4884826],
[Article]

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.

Item Type: Article
Erschienen: 2014
Creators: Yao, Fang-Zhou and Patterson, Eric A. and Wang, Ke and Jo, Wook and Rödel, Jürgen and Li, Jing-Feng
Title: Enhanced bipolar fatigue resistance in CaZrO3-modified (K,Na)NbO3 lead-free piezoceramics
Language: English
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.

Journal or Publication Title: Applied Physics Letters
Volume: 104
Number: 24
Uncontrolled Keywords: Ceramics; Piezoelectric fields; Electrical resistivity; Domain walls; Electrodes
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 24 Jun 2014 08:55
Official URL: http://dx.doi.org/10.1063/1.4884826
Identification Number: doi:10.1063/1.4884826
Funders: This work was supported by National Nature Science Foundation of China (Grant Nos. 51332002, 51302144, 51221291, and 51211140345), Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20130002120031), , and Tsinghua University Initiative Scientific Research Program (Grant No. 20131089230). K. Wang acknowledges the Alexander von Humboldt foundation for a fellowship.
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