Abstract
Ba0.65Sr0.35TiO3 (BST) ceramics were synthesized by sol–gel route. The diffusion phase transition (DPT) characteristic was found in the temperature range from 150 to − 35 °C. The value of the DPT parameter γ values are 1.53 and 1.75, respectively at applied dc field of 0 and 16.7 kV/cm. It is implied that the phase transition of BST ceramics become more diffuse under the applied electric field. Temperature dependent polarization–electric field hysteresis loops were studied. It was found that the energy storage properties and electrocaloric effect near room temperature were the function of electric fields. The maximum value of recoverable energy density was 0.2812 J/cm3 with energy storage efficiency (η) of 78.67% obtained at room temperature under an electric field of 75 kV/cm. The largest η can achieve 98% under low electric field of 50 kV/cm. A large electrocaloric temperature change (ΔT max = 0.49 K) near room temperature was obtained by indirect method. Taken together, the ceramics have a promising candidate for energy-storage applications and cooling systems in the room temperature.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 11574057 and 51604087), the Guangdong Provincial Natural Science Foundation of China (Grant No. 2016A030313718), and the Science and Technology Program of Guangdong Province of China (Grant Nos. 2016A010104018, and 2017A0104022).
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Ge, PZ., Tang, XG., Liu, QX. et al. Energy storage properties and electrocaloric effect of Ba0.65Sr0.35TiO3 ceramics near room temperature. J Mater Sci: Mater Electron 29, 1075–1081 (2018). https://doi.org/10.1007/s10854-017-8008-x
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DOI: https://doi.org/10.1007/s10854-017-8008-x