Temperature dependence of piezoelectric properties of the binary Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ single crystals prepared by continuous feeding Bridgeman method

Abstract We have confirmed that the temperature dependence of the dielectric constant and piezoelectric charge constant of length-extensional mode d 31 of AC poled (ACP) Pb(Mg 1/3 Nb 2/3 )O 3 -0.3PbTiO 3 single crystals (SC) is 15 °C higher than that of DC poled (DCP) SC. The ACP SC, grown by the continuous feeding Bridgman process exhibited a d 31 of −2500 pC N −1 at 88 °C and maintained over −700 pC N −1 up to 105 °C. In comparison, the DCP SC showed a d 31 of −1500 pC N −1 at 88 °C and only maintained −700 pC N −1 up to 90 °C. In addition, low frequency constant N 31 of 560 Hz·m at 25 °C and 390 Hz·m at 88 °C of the ACP SC showed 25% and 37% lower than those of DCP SC. The ACP SC outperforms DCP SC not only in piezoelectric properties at room temperature but also heat resistance and this information is important for future ultrasound devices design.