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The domain wall contribution to the electrocaloric effect (ECE) in the BaTiO3 (BTO) nanoparticle at room temperature is investigated using a phase-field model combined with thermodynamics analysis. The results show that the domain structure which relates to the size has a significant effect on the ECE in the BTO nanoparticle. When the size of the BTO nanoparticle decreases, the domain structure undergoes...
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