Structural and dielectric properties of MgO doped 0.8PMN-0.2PT solid solution

Abstract

In the present work, perovskite PMN and 0.8 PMN-0.2 PT solid solution were prepared by columbite processing technique. The effect of minor addition of excess (1 wt.%) MgO on the microstructure and dielectric constant of the samples in 0.8PMN-0.2PT sintered at 900°C and 1000°C for 4 h in PbO-rich atmosphere was investigated. The addition has resulted higher dielectric constant with an increase in transition temperature. Also average grain size has increased. Due to the excess MgO addition, the nature of phase transition has also been changed from diffuse to near normal behaviour.