Abstract
The domain structures of (001) plates of (1–x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) single crystals were observed at room temperature after 240°C thermal treatment at various cooling rates. The starting composition of the PMN-PT single crystals was x=0.32; the dielectric constant of the single crystals exhibited a maximum at 153°C. Contact resonance piezoresponse force microscopy (CR-PFM) was utilized for domain imaging, because microdomain images could be obtained without domain structure degeneration. The average size of domains strongly depended on the cooling rate. The obtained domain images were approximately fingerprint patterned on a micron scale, but were fragmented by circular domains on a submicron scale. These finer circular domain structures were probably microdomains that existed in the relaxor phase and were subsequently quenched during the relaxor-to-ferroelectric phase transition.
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