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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

Author(s)
Luo, ZhenhuaGranzow, TorstenGlaum, JuliaJo, WookRoedel, JuergenHoffman, Mark
Issued Date
2011-11
DOI
10.1111/j.1551-2916.2011.04605.x
URI
https://scholarworks.unist.ac.kr/handle/201301/7546
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=80054974993
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.94, no.11, pp.3927 - 3933
Abstract
The fatigue behavior of the lead-free piezoelectric Bi1/2Na1/2 TiO3-BaTiO3-K0.5Na0.5NbO3 (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 micro-cracks, while in mainly non-ferroelectric systems with high KNN-content fatigue can be rationalized by the repeated field-induced 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.
Publisher
WILEY-BLACKWELL
ISSN
0002-7820

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