Effect of inactive volume on thermocouple measurements of electrocaloric temperature change in multilayer capacitors of 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3

On increasing the active/total volume ratio of 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 multilayer capacitors (MLCs), the electrocaloric temperature change measured using a thermocouple near the centre increases, until saturating to reveal the nominally adiabatic limit (|ΔT| ~ 2.7 K for rapid field changes of...

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Bibliographic Details
Published inJournal of physics. D, Applied physics Vol. 50; no. 42
Main Authors Usui, T, Hirose, S, Ando, A, Crossley, S, Nair, B, Moya, X, Mathur, N D
Format Journal Article
LanguageEnglish
Published IOP Publishing 22.09.2017
Subjects
electrocaloric effect
ferroelectric ceramic
multilayer capacitor
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Summary:On increasing the active/total volume ratio of 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 multilayer capacitors (MLCs), the electrocaloric temperature change measured using a thermocouple near the centre increases, until saturating to reveal the nominally adiabatic limit (|ΔT| ~ 2.7 K for rapid field changes of |ΔE|  =  28.8 V µm−1). For all MLCs that we studied, the practice of multiplying the measured temperature change by the total/active heat capacity ratio causes the adiabatic temperature change to be overestimated by a small numerical factor. These findings highlight the challenge associated with quantifying electrocaloric effects in MLCs of the type that are currently being used as working bodies in prototype cooling devices.
Bibliography:JPhysD-113752.R1
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aa87a5