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Abstract
Influence of thermal treatment below and above the ferroelectric transition temperature on the domain reversal properties of KTP crystals has been studied. Bidomain structure is formed in z-cut samples with negative and positive external surfaces upon annealing in air and KTP crystalline powder respectively. Time and temperature dependencies of the domain inversion layer thicknesses have been determines using piezoelectric measurements. The results are discussed in terms of spontaneous polarization inversion due to ionized defect gradients created by out- and indiffusion of potassium and oxygen ions.