Large barocaloric effect and pressure mediated electrocaloric effect in Pb0.99Nb0.02(Zr0.95Ti0.05)0.08O3 ceramics

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, ∆TEC could be improved from 1 K to 4.5 K. Similarly, a peak unbiased ∆TBC 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 potential of multicaloric cooling capacity of bulk ferroelectric materials. This article is protected by copyright. All rights reserved.

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