Abstract
Electrical response and energy storage behaviour of PZN-PT, PMN-PT, PZN–PMN-PT (PZN-PbZnl/3Nb2/3O3, PMN-PbMg1/3Nb2/3O3 and PT-PbTiO3) solid solutions were investigated. SEM micrographs of the sample showed grains of unequal sizes distributed throughout the sample. The average grain size observed was about 0.77 μm for PZN-PT, 0.93 for PMN-PT and 1.82 for PZN–PMN-PT solid solutions. All the solid solutions exhibited good dielectric relaxation behaviour up to 500 °C in the frequency range of 1–2 MHz. The solid solutions showed improved ferroelectric properties (Pr ~ 17.4 μC cm−2, Ec ~ 3.65 kV cm−1, Pm ~ 20.1 μC cm−2 for PZN-PT) and crossover from nonergodic to ergodic relaxor phase with respect to temperature. The optimum piezoelectric coefficients, the piezoelectric voltage coefficients of the solid solutions were also studied. P–E loop analysis confirmed high energy storage density (W) of 0.25 J cm−3 at 50 kV cm−1 for PZN–PMN-PT which substantiates its wide use in capacitor applications.
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