Effect of inactive volume on thermocouple measurements of electrocaloric temperature change in multilayer capacitors of 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3
Journal of Physics D - Applied Physics
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Moya Raposo, X., & Mathur, N. (2017). Effect of inactive volume on thermocouple measurements of electrocaloric temperature change in multilayer capacitors of 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3. Journal of Physics D - Applied Physics, 50 (424002)https://doi.org/10.1088/1361-6463/aa87a5
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.
electrocaloric effect, ferroelectric ceramic, multilayer capacitor
XM is grateful for the support from the UK EPSRC grant EP/M003752/1 and the Royal Society. BN is grateful for the support from Gates Cambridge and the Winton Programme for the Physics of Sustainability.
Royal Society (uf120210)
External DOI: https://doi.org/10.1088/1361-6463/aa87a5
This record's URL: https://www.repository.cam.ac.uk/handle/1810/267930
Attribution 3.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International
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