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    Effect of Ferroelectric Long-Range Order on the Unipolar and Bipolar Electric Fatigue in Bi1/2Na1/2TiO3-Based Lead-Free Piezoceramics

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    Authors
    Luo, Zhenhua
    Granzow, T.
    Glaum, J.
    Jo, W.
    Rodel, J.
    Hoffman, M.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Luo, Z. and Granzow, T. and Glaum, J. and Jo, W. and Rodel, J. and Hoffman, M. 2011. Effect of Ferroelectric Long-Range Order on the Unipolar and Bipolar Electric Fatigue in Bi1/2Na1/2TiO3-Based Lead-Free Piezoceramics. Journal of the American Ceramic Society. 94 (11): pp. 3927-3933.
    Source Title
    Journal of the American Ceramic Society
    ISSN
    0002-7820
    URI
    http://hdl.handle.net/20.500.11937/17373
    Collection
    • Curtin Research Publications
    Abstract

    The fatigue behavior of the lead-free piezoelectric Bi1/2Na1/2 TiO3–BaTiO3K0.5Na0.5NbO3 (BNT-BT-KNN) under bipolar and unipolar electrical loading is investigated. Special attention is paid to the effect of a decreasing ferroelectric order which was affected by an increase in KNN-content. It is found that,in mainly ferroelectric systems with low KNN-content, bipolar cycling leads to domain wall pinning and formation of microcracks, while in mainly non-ferroelectric systems with high KNN-content fatigue can be rationalized by the repeated fieldinduced phase transition occurring during each field cycle. Under unipolar load, fatigue in low-KNN systems is dominated by domain wall pinning and the formation of a space charge field. Only the latter effect is present in non-ferroelectric high-KNN systems, which fatigue to a smaller degree.

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