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In this work, the influence of temperature on phase structure, dielectric property and domain structure of (K,Na)(Nb,Ta)O 3  (KNNT) crystal from 20 to 200 °C was studied. The irreversible domain wall motion of single crystal is strongest at phase transition temperature by Rayleigh analysis of dielectric properties. The domain structure in the heating and cooling process of single crystal was observed by means of piezoelectricity microscope. The domain structure changed obviously with temperature and the domain structure change is particularly prominent at the phase transition temperature.

Temperature dependence of dielectric properties and domain structure of (K,Na)(Nb,Ta)O 3 single crystal