Piezoelectric and Dielectric Properties of MnO 2 -Modified Bi(Mg 1/2 Ti 1/2 )O 3 –PbTiO 3

We reported that Bi(Mg1/2Ti1/2)O3–PbTiO3 (BMT-PT) systems had high piezoelectric, dielectric performances and high Curie temperature. The phase structure of the system was identified by X-ray diffraction analysis. The piezoelectric and dielectric properties were also investigated. The results showed that 0.6BMT–0.4PT (Mg/Ti = 0.5:0.5) with 1mol% MnO2 was the optimum composition which exhibited the highest curie temperature Tc = 511 °C and the stable temperature of dielectric loss reached to 500 °C. Further, the dielectric and piezoelectric properties of this composition were given as follows:kp = 22.5%;er= 734; room temperature d33 = 131.3 pC/N; tanδ = 1.96%.