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01746 am a22001813u 4500 |
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364508 |
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|a Luo, Zhenhua
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|a Granzow, Torsten
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|a Glaum, Julia
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|a Jo, Wook
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|a Rödel, Jürgen
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|a Hoffman, Mark
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|a Effect of ferroelectric long-range order on the unipolar and bipolar electric fatigue in Bi<sub>½</sub>Na<sub>½</sub>TiO<sub>3</sub> - based lead-free piezoceramics
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|c 2011-11.
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|z Get fulltext
|u https://eprints.soton.ac.uk/364508/1/Effect%2520of%2520ferroelectric%2520long-range%2520order%2520on%2520the%2520unipolar%2520and%2520bipolar%2520electric%2520fatigue%2520in%2520Bi12Na12TiO3%2520%25E2%2580%2593%2520based%2520lead-free%2520piezoceramics.pdf
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|a The fatigue behavior of the lead-free piezoelectric Bi<sub>½</sub>Na<sub>½</sub>TiO<sub>3</sub>-BaTiO<sub>3</sub>-K<sub>½</sub>Na<sub>½</sub>NbO<sub>3</sub> (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 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.
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