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More and more researchers start to pay attention to the electrocaloric temperature change (∆T) in polar materials, which is caused by an applied electric field. In this paper, Ba-doped PbHfO3 (PBH) films were prepared by sol-gel method. Their components, microstructures, dielectric polarization and electrocaloric effects (ECEs) were investigated. With the addition of Ba2+, PBH films went from antiferroelectric (AFE) to ferroelectric (FE). At the same time, their dielectric peaks shifted toward lower temperature. The maximum ∆T obtained in Pb0.8Ba0.2HfO3 FE film is 41.1 K, which is an order of magnitude larger than PbHfO3 film (∆T ~ −4 K at 50 ℃) and Pb0.9Ba0.1HfO3 film (∆T < 4 K at 120 ℃). In order to explain this phenomenon, the Landau-Devonshire theory was adopted. Our analysis shows that the rapid variation of energy barrier height near the phase transition temperature is beneficial to obtain large polarization change and high △T, which is needed in solid-state cooling devices.
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