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Origin of the Large Negative Electrocaloric Effect in Antiferroelectric PbZrO3
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.Comment: Article (17 pages) and supplemental material (12 pages) present in
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