Large barocaloric effect and pressure‐mediated electrocaloric effect in Pb0.99Nb0.02(Zr0.95Ti0.05)0.08O3 ceramics |
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| Authors: | Satyanarayan Patel Aditya Chauhan Rahul Vaish Christopher S Lynch |
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| Affiliation: | 1. School of Engineering, Indian Institute of Technology Mandi, Mandi, India;2. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK;3. Department of Mechanical and Aerospace Engineering, University of California, Los Angeles (UCLA), Los Angeles, California |
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| Abstract: | Ferroelectric materials are being actively explored for next‐generation solid‐state cooling technology. Even though bulk materials possess an advantage in terms of overall heat extraction capacity, their performance is limited due to low adiabatic temperature change. In this regard, the present article explores enhanced cooling capacity of bulk polycrystalline Pb0.99Nb0.02(Zr0.95Ti0.05)0.08O3 (PNZT) through external‐field mediation and coupled caloric effects. Barocaloric (BC) and electrocaloric (EC) effects were indirectly estimated using polarization versus electric field (P‐E) loops (under varying pressure and temperature). It was observed that under applied pressure of 325 MPa, ΔTEC could be improved from 1 K to 4.5 K. Similarly, a peak unbiased ΔTBC of 1.5 K could be enhanced to 5.3 K under an electric field of 5 MV·m?1. These figures correspond to an improvement of ~400% over the unbiased values. The results are indicative of the multicaloric cooling capacity of bulk ferroelectric materials. |
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| Keywords: | barocaloric coupled caloric electrocaloric solid‐state refrigeration |
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