Peculiar temperature-stable piezoelectric performance and strong self-poling effect in tetragonal phase Bi(Mg1/2Ti1/2)O3–PbTiO3 single crystals with high usage temperature

Abstract

A peculiar temperature-stable piezoelectric performance and strong self-poling effect was observed in tetragonal phase ferroelectric single crystals 0.38Bi(Mg_1/2Ti_1/2)O₃–0.62PbTiO₃. The piezoelectric coefficient d₃₃ 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 °C, which is much higher than the Curie temperature T_c ∼ 520 °C.