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Tunable Temperature Range of Stress-Enhanced Electrocaloric Effects in Composition Gradient Bilayers
X. Sun1, H. Huang2, X. Ma2, Y. Wen1, Z.-M. Dang3
1 Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China
2 Department of Physics, University of Science and Technology Beijing, Beijing 100083, China
3 Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
received January 3, 2018, received in revised form Febuary 21, 2018, accepted March 12, 2018
Vol. 9, No. 2, Pages 201-208 DOI: 10.4416/JCST2018-00002
Abstract
We investigated a tunable temperature range of stress-enhanced electrocaloric effects in composition gradient bilayers by using the phenomenological Landau-Devonshire thermodynamic theory. A tunable temperature range of entropy change was obtained from 265 ∼ 270 K for the specific composition of BaSrTiO3 bilayers. Theoretical analysis shows that the external stress can tune the temperature range of electrocaloric effects from 220 K to 286 K, and the stress can tune the maximum temperature change 13 K per GPa. The thickness ratio of composition gradient films also can vary the adiabatic temperature change under constant stress. The present study therefore contributes to the understanding of stress effects of electrocaloric cooling and provides guidance for experiments to design high-efficiency cooling devices.
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Keywords
Keywords: Electrocaloric effect, ferroelectric gradient bilayers, thermodynamic calculation, tunable temperature range.
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