Electric-field-induced and temperature-induced phase transitions in high-strain ferroelectricPb(Mg1/3Nb2/3)0.67Ti0.33O3 single crystal

Abstract

This work is to study electric (E)-field-induced and temperature-induced phase transitions in (001)-cutPb(Mg1/3Nb2/3)0.67Ti0.33O3 (PMNT33%) single crystal, which are critical concerns for piezoelectric applications. Dielectricproperties and domain structures (by polarizing microscope) are measured as functions of temperatureand E field. The hysteresis loop of the polarization versusE field at room temperature is also measured. Without anyE-field application, upon heating a first-order-type phase transition sequence rhombohedral (C) takes place near 350 and 430 K, respectively. Under a dcE-field application along [001] at room temperature, [001] tetragonal(T001) phase domains are induced by various phase transition sequences, i.e. , , , and , as the E-field strengthincreases. In addition, E-field-induced microcracking is observed in this work.