Abstract
The electrocaloric effect cooling is a promising next-generation cooling technology due to its high energy efficiency. In this work, the phase diagrams of BiFeO3-PbTiO3 solid solution have been investigated via Landau-Devonshire theory. Here, in the vicinity of morphotropic phase boundary, a relatively low electric field of 5 MV/m induces a giant electrocaloric temperature change (ΔT = 23.56 K) in a 0.81BiFeO3-0.19PbTiO3 solid solution at 630 K. It is found that the range of temperature change of ECE is broader with the increase of BiFeO3 mole fraction. In addition, a broader ECE working temperature range can be obtained near the MPB region by applying hydrostatic pressure of 1 GPa. These results suggest that this system is a potential candidate for practical electrocaloric materials.
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