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Study of electrocaloric effect in lead-free 0.9K0.5Na0.5NbO3–0.1CaZrO3 solid solution ceramics

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Abstract

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.

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Acknowledgements

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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  1. Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India

    Sanjeev Kumar & Satyendra Singh

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  1. Sanjeev Kumar
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  2. Satyendra Singh
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Correspondence to Satyendra Singh.

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Kumar, S., Singh, S. Study of electrocaloric effect in lead-free 0.9K0.5Na0.5NbO3–0.1CaZrO3 solid solution ceramics. J Mater Sci: Mater Electron 30, 12924–12928 (2019). https://doi.org/10.1007/s10854-019-01654-w

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