Memory effect in [001] poled 0.92Pb(Zn1/3Nb2/3)O3–0.08PbTiO3 single crystals

Mingrong Shen; Wenwu Cao
May 2005
Applied Physics Letters;5/9/2005, Vol. 86 Issue 19, p192909
Academic Journal
We have conducted dielectric and pyroelectric measurements in [001] poled rhombohedral phase 0.92Pb(Zn1/3Nb2/3)O3–0.08PbTiO3 single crystals from room temperature to 250 °C. An interesting poling history dependence has been revealed from the experimental results. Compared with room-temperature poled samples, crystals poled via the field-cooling method have a much lower rhombohedral-to-tetragonal phase transition temperature and have enhanced spontaneous polarization while heating up to the tetragonal phase. Such phenomena may be explained by the memory effect of dipolar defect alignment in the sample poled by the field-cooling method.


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