Peculiar Temperature-Stable Piezoelectric Performance And Strong Self-Poling Effect In Tetragonal Phase Bi(Mg1/2ti1/2)O-3-Pbtio3 Single Crystals With High Usage Temperature

A peculiar temperature-stable piezoelectric performance and strong self-poling effect was observed in tetragonal phase ferroelectric single crystals 0.38Bi(Mg1/2Ti1/2)O-3-0.62PbTiO(3). The piezoelectric coefficient d(33) of the as-prepared sample with self-poling is 158 pC N-1, and it is as high as 75% of the value produced by an external electric field. The internal electric field E-i exists and the value is 4.34 kV cm(-1) at the applied electric field of 40 kV cm(-1). The defect dipoles pin on the ferroelectric domains and stabilize the piezoelectric properties and the piezoelectric coefficient d33 at room temperature is nearly unchanged until the annealing temperature up to 800 degrees C, which is much higher than the Curie temperature T-c similar to 520 degrees C.