Abstract
A barium titanate crystal, which consists of a region with sparse a-c domain pattern and two regions with dense domain pattern, was specially prepared. During the in-plane bipolar electric field loading, this specimen showed double polarization versus electric field (P-E) loops. To understand the origin of the observed double P-E loops, polarization responses of these regions were measured separately. It was found that the region with sparse a-c domain pattern showed typical P-E loop; however, the regions with dense domain pattern were very stable, and hardly any remnant polarizations were observed. Further analysis demonstrated that the double P-E loops might be caused by incompatible domain switching in the specimen during electric field loading.
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