We have studied the electrocaloric response of the archetypal antiferroelectric PbZrO3 as a function of voltage and temperature in the vicinity of its antiferroelectric-paraelectric phase transition. Large electrocaloric effects of opposite signs, ranging from an electro-cooling of -3.5 K to an electro-heating of +5.5 K, were directly measured with an infrared camera. We show by calorimetric and electromechanical measurements that the large negative electrocaloric effect comes from an endothermic antiferroelectric-ferroelectric switching, in contrast to dipole destabilization of the antiparallel lattice, previously proposed as an explanation for the negative electrocaloric effect of antiferroelectrics.
@article{arxiv.2009.02184,
title = {Origin of the Large Negative Electrocaloric Effect in Antiferroelectric PbZrO3},
author = {Pablo Vales-Castro and Romain Faye and Miquel Vellvehi and Youri Nouchokgwe and Xavier Perpinà and J. M. Caicedo and Xavier Jordà and Krystian Roleder and Dariusz Kajewski and Amador Perez-Tomas and Emmanuel Defay and Gustau Catalan},
journal= {arXiv preprint arXiv:2009.02184},
year = {2021}
}
Comments
Article (17 pages) and supplemental material (12 pages) present in .pdf file