Phase diagram and electrical properties of Pb(Yb1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 ternary ceramics

The ternary ferroelectric ceramics Pb(Yb1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 (PYN–PMN–PT), in the vicinity of morphotropic phase boundary (MPB) region, have been prepared by a two-step synthetic process. The ternary phase diagram at room temperature has been established based on the XRD data analysis, which exhibits a curved MPB region. The dielectric, ferroelectric and piezoelectric properties have been characterized, indicating the electrical properties can be adjusted regularly by choosing compositions. The Curie temperature TC of ternary system varied from 165 to 370 °C. With the increase of PMN content, the piezoelectric coefficients d33 increase from 373 to 505 pC/N, and the coercive field Ec decrease from 18 to 6 kV/cm. The results show that the PYN–PMN–PT ternary system can be a potential material for high temperature applications.