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Large barocaloric effect and pressure‐mediated electrocaloric effect in Pb 0.99 Nb 0.02 (Zr 0.95 Ti 0.05 ) 0.08 O 3 ceramics
Author(s) -
Patel Satyanarayan,
Chauhan Aditya,
Vaish Rahul,
Lynch Christopher S.
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15011
Subject(s) - electrocaloric effect , materials science , electric field , ferroelectricity , adiabatic process , heat capacity , condensed matter physics , crystallite , thermodynamics , analytical chemistry (journal) , metallurgy , optoelectronics , chemistry , dielectric , physics , chromatography , quantum mechanics
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 Pb 0.99 Nb 0.02 (Zr 0.95 Ti 0.05 ) 0.08 O 3 ( 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 MP a, Δ T EC could be improved from 1 K to 4.5 K. Similarly, a peak unbiased Δ T BC 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.