Abstract
A systematic investigation of both electrocaloric effect (ECE) and energy storage properties is presented in the Pb0.88La0.08(Zr0.60Ti0.40)O3 relaxor system. The ECE, studied from direct and indirect methods, revealed an electrocaloric temperature change (ΔT) around 1.6 K, under an applied electric field of 60 kV/cm at room temperature, with a corresponding electrocaloric strength (ΔT/ΔE) around 0.03 K cm/kV. The temperature dependence of ΔT displayed its maximum value (∼2.32 K) around the freezing temperature (Tf), which is known as a critical temperature for relaxor ferroelectrics, thus suggesting an important contribution of the polar nanoregions to the electrocaloric properties. This result, together with the observed recoverable energy density (Jr) value around 0.43 J/cm3 and a relatively high discharge energy efficiency, reveals the studied system as a promising material for application in multifunctional devices based on high ECE materials combined with excellent energy storage performance.
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