Dielectric, piezoelectric and pyroelectric properties of PMN–PT (68:32) system

Solid solution of 32 mol% of Lead Titanate in PMN–PT system has been prepared by columbite precursor method. Room temperature X-ray diffraction study reveals the formation of perovskite phase with tetragonal structure. Dielectric measurements have been carried out at different frequencies (0.1 kHz–1 MHz) as a function of temperature (RT to 235 °C). The phase transition was found to be of diffused type. The polarization studies show ferroelectric nature of the material with a high value of remnant polarization (Pr) ∼21 μC/cm2 and spontaneous polarization (Ps) ∼29 μC/cm2. Strain versus electric field (S–E) behavior shows piezoelectric nature of the material with high value of maximum strain 0.14% at 60 kV/cm. Pyroelectric coefficient at room temperature has been found to be 3×10−2 μC/cm2 K.