Abstract
ABSTRACT Systemic transmission electron microscopy investigations have been performed on bismuth layer structure ferroelectrics (BLSFs). Ferroelectric domains concluding 90° domain and 180° domain, and antiphase boundary were observed in dark field images and the characters for the 90° domain walls are summarized. We found that the fatigue behaviors of BLSFs show an obvious correlation with the morphology of the 90° domain wall. A microcosmic fatigue mechanism of BLSFs is put forward based on our study: the 180° domains are considered to nucleate at the 90° domain wall, which can be inhibited by charged oxygen defects in switching. The morphology of 90° domain wall is suggested to be a criterion for fatigue behavior in ferroelectrics.
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