We report a heat dynamics analysis of the electrocaloric effect (ECE) incommercial multilayer capacitors based on BaTiO3 dielectric, a promisingcandidate for applications as a solid state cooling device. Direct measurementsof the time evolution of the sample's temperature changes under differentapplied voltages allow us to decouple the contributions from Joule heating andfrom the ECE. Heat balance equations were used to model the thermal couplingbetween different parts of the system. Fingerprints of Joule heating and theECE could be resolved at different time scales. We argue that Joule heating andthe thermal coupling of the device to the environment must be carefully takenin to account in future developments of refrigeration technologies employingthe ECE.
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