Composition and orientation dependence of dielectric and piezoelectric properties in poled Pb(Mg1/3Nb2/3)O3-PbTiO3 crystals

Temperature and orientation dependence of dielectric constant and discharging current was investigated in the poled single crystals of (1-x)Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) with x varying from 0.24 to 0.38, furthermore, composition and orientation dependence of the room temperature piezoelectric constant d(33) was also summarized. Temperature, frequency, orientation, and composition dependence of the dielectric constant in the poled crystals shows that domain configurations and phase transitions in the poled crystals strongly depend on both composition and orientation. Compared to the monodomain crystals, the poled polydomain crystals, especially near the morphotropic phase boundary, presented large piezoelectric and dielectric susceptibilities. High piezoelectric response of these < 001 > poled crystals with x between 0.28 and 0.30 in a broad temperature scope makes them the most promising candidate for potential practical applications. (c) 2006 American Institute of Physics.