Abstract
Ferroelectric domain patterns which appear under three different quenching conditions have been studied by means of an etching technique. When a b -plate sample is quenched from above T C , a three-dimensional pattern which varies dramatically along the thickness direction is often observed. When single-domain samples are quenched from temperatures between about T C -30°C and T C , the polarization reversal occurs locally and two-dimensional domain patterns are formed. The polarization reversal is caused by the depolarization field which appears during quenching even when the electrodes are short-circuited. When a single-domain sample is heated and quenched in the middle of the C-to-IC transition, the nucleated IC phase regions are converted to ferroelectric domains. These domains and those produced by the polarization reversal in the commesurate phase regions are superposed to one another and make up complicated domain patterns.
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