Abstract
The fatigue behavior of the lead‐free piezoelectric Bi1/2Na1/2TiO3–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 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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