Strain assisted electrocaloric effect in PbZr0.95Ti0.05O3 films on 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 substrate

Abstract

Solid state cooling technologies based on electrocaloric, magnetocaloric and mechanocaloric effects have received much attention during the past decade. To further improve the cooling efficiency and reduce the driving field, it is desirable to combine multiple effects in a single system. Here, we report on the caloric effects induced by both electric field and strain in PbZr0.95Ti0.05O3 films deposited on 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 substrate. The isothermal entropy change (ΔS) induced by the antiferroelectric-ferroelectric phase transition of PbZr0.95Ti0.05O3 films is calculated to be 6.78 J K−1 kg−1. Furthermore, the strain from 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 substrate can reduce the electric field where ΔS reaches the maximum by as much as 50 kV/cm. The electrocaloric efficiency is also increased from 0.366 to 0.378 by the strain effect. The electrocaloric effect in an antiferroelectric material assisted by strain may lead to more efficient solid state cooling technology.

Morphology Control of Mixed Metallic Organic Framework for High‐Performance Hybrid Supercapacitors

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A scaling law for distinct electrocaloric cooling performance in low-dimensional organic, relaxor and anti-ferroelectrics

“…The acquired quadratic increase of EC entropy and temperature change with E successfully reproduces the ∆ T changes with E 2 in dipole glasses 28 measured as early as in 1965 and the recently-proposed quadratic scaling law of ∆ T in PbZrO 3 AFE 29 . It is also worth noting that both the proportional increase and the saturating trend of either ∆ T or (−∆ S ) are frequently observed in pretty rich low-dimensional EC materials 30 – 34 .…”

“…( c ) Direct comparison of calculated (−∆S) curves vs E with two sets of indirect experimental data in PZT AFE thin film. The BaTiO 3 , P(VDF-TrFE-CFE), 0.65PMN-0.35PT, BZT, PLZT and PZT data is derived from refs 11 , 30 , 31 , 32 , 33 and 34 , respectively. …”

High‐Performance Li‐Ion and Na‐Ion Capacitors Based on a Spinel Li4Ti5O12 Anode and Carbonaceous Cathodes

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