Temperature dependence of transverse and shear mode properties for 0.71Pb(Mg1/3Nb2/3)O3–0.29PbTiO3 single crystal with the optimal orientation

Abstract

The temperature dependence of the coupling constants kμν and piezoelectric constants dμν, gμν of transverse and shear mode 0.71Pb(Mg1/3Nb2/3)O3–0.29PbTiO3 (PMN–29%PT) single crystals with optimal orientation from room temperature to 115 °C were reported. From 20 °C to approximately 80 °C, k31 increases slightly from 91.0% to 93.5%, while d31 increases from 1900.0 to 4500.0 pC N−1. When the temperature exceeds 80 °C, both k31 and d31 begin to drop. Similarly, the coupling factor k15 increases from 95% to 97%, while the piezoelectric constant d15 increases from 4769.4 to 14293.2 pC N−1when the temperature rises from room temperature to 93 °C. When the temperature goes beyond 93 °C, the shear-mode piezoelectric properties start to decay. We also study the temperature dependence of the elastic compliances and , both of which show strong dependence of the temperature. The service temperature for PMN–29%PT is determined to be lower than 80 °C for transverse vibration and lower than 93 °C for shear-mode samples. These would effectively guide the correlative device designs and practical applications.