Abstract
Polarization fatigue of bismuth ferrite-based ceramics was studied and opposite physical behaviors (polarization enhancement and degradation) during field-cycling process can be respectively observed by composition modification. Especially, partially recoverable behavior caused by unstable polarization attributed from defect dynamics can be evidently observed by designing discontinuous field-cycling. Different from well-known domain wall pinning effect and microstructure damage, a qualitative model including field assisted depinning and domain wall pinning was proposed to interpret the origin of the unusual characteristics in terms of defect dynamics during field-cycling process, which involves the migration of charged defects and polarization rotation under field-cycling.
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