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Based on a phenomenological model, the electrocaloric effects accompanied with the ferroelectric to paraelectric phase transition in relaxor ferroelectric 0.9PbMg1/3Nb2/3O3–0.1PbTiO3 thin film were investigated. The model reproduces the essential features of the experimentally observed behavior and also gives a description of the electric field dependence of the electrocaloric effect. The simulated...