Temperature dependence of full matrix material constants of [001]_c poled 0.71Pb(Mg_1/3Nb_2/3)O₃-0.29PbTiO₃ single crystal

Up to date, there are no self-consistent full matrix data in the literature on the temperature dependence of material constants for [001]_c poled (1-x)Pb(Mg_1/3Nb_2/3)O₃-xPbTiO₃ (PMN-xPT) single crystals because it is very challenging to measure such data for low Q-value ferroelectric materials. We report here a combined characterization method to resolve this issue using two samples. The temperature dependence of full set material constants of [001]_c poled PMN-0.29PT single crystal was measured from 20 °C to 60 °C. The thickness shear mode sample was used for measuring the material constants having low sensitivity to the resonance spectroscopy method. Another thickness extensional mode sample was used for the determination of the remaining constants. Such temperature dependence of full matrix data would make accurate simulation designs and performance predictions of single crystal devices a reality, which is critically important because sample temperature will increase during the operation. This method may also be used to characterize other anisotropic piezoelectric materials with low Q-values.