Study of electrocaloric effect in lead-free 0.9K0.5Na0.5NbO3–0.1CaZrO3 solid solution ceramics
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Ferroelectric (FE) materials with large electrocaloric effect (ECE) in a broad operational temperature span are very attractive for solid-state cooling device applications. We have experimentally investigated the ECE in eco-friendly 0.9K0.5Na0.5NbO3–0.1CaZrO3 ferroelectric solid solution ceramics synthesized through a solid-state synthesis route. The polarization measurements as a function of applied electric fields were carried-out in a large temperature range and the ECE was calculated by an indirect thermodynamic approach. The maximum value of ECE (ΔT) was found to be 0.27 K at 402 K under the electric field of 40 kV/cm and the corresponding EC responsivity (∆T/∆E) was found to be 0.675 × 10−7 K mV−1. The results of ECE response show that this material has the great potentials for its utility in next generation solid state refrigeration technologies.
S. Singh gratefully acknowledges the financial support received from DST (PURSE-II) and SERB (EEQ/2016/000256), Govt. of India. S. Kumar acknowledges the award of the junior research fellowship from CSIR, Govt. of India. Authors appreciate their fruitful discussions with the group member Mr. Raju Kumar.
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