Abstract
This study reports the processing and characterization of Pb0.96Sm0.025[Mg1/3Nb2/3]0.70Ti0.30O3 (Sm-PMN-PT) polycrystalline ceramics for solid-state refrigeration technologies. The composition illustrated maximum polarization of nearly 40 μC/cm2 at 293 K for an applied electric field of 17.5 kV/cm and piezoelectric coefficients d33 ∼ 146 pm/V under application of 10 kV/cm. It also showed a pyroelectric coefficient −4610 µC/m2/K1 in the temperature range 340 – 370 K. In contrast to parent PMN-PT, the composition showed above room-temperature ferroelectric transition offering an appealing change in polarisation and better suitability from a device viewpoint. Due to this, the present study explored Sm-PMN-PT for an electrocaloric effect (ECE) using Maxwell relations. Our calculations suggest a maximum ECE entropy (|∆S|) and temperature (|∆T|) changes of 0.55 J/Kg.K and 0.7 K for a broad temperature range of 20 K (390–410 K), respectively.
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