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Anomalous “Fatigue” Effect in High-Temperature Ferroelectric Crystal LaBGeO5

In this report we present the first data on the switching processes in LaBGeO5 crystals in the temperature region up to transition point (Tc=533°C). At room temperature the crystal has an extremely high coercive field even at ultra low frequencies (Ec ∼ 150 kV/cm, f = 0.1 Hz) and a large switching time (near 0.3 s in step field mode). It is shown that the “normal” hysteresis loops can be observed at f = 50 Hz above 250°C up to Tc without typical for high-temperature ferroelectrics conductivity distortion. In the Merz-type rectangular pulse field mode some “nonclassical” features of switching processes were revealed above 400°C. That is the sharp dependence of the switching parameters on the prehistory of the samples. The sequence of forms of switching currents was found to be in the close connection with kind of preparation of the initial domain structure. It is shown that the mechanism of polarization reversal processes are different for multi- and single-domain initial state.