Composition Dependence of Electrocaloric Effect in (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 Single Crystals |
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| Authors: | QIU Jian-Hua WANG Xiu-Qin YUAN Ning-Yi DING Jian-Ning |
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| Affiliation: | 1. Center for Low-Dimensional Materials, Micro-Nano Devices and System, Changzhou University, Changzhou 213164, China;2. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;3. Jiangsu Key Laboratory for Photovolatic Engineering Science, Changzhou University, Changzhou 213164, China;4. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, China |
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| Abstract: | Composition dependence of electrocaloric effect is investigated in (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 single crystals by using an eighth-order Landau—Devonshire theory. The applied electric field along [001] direction reduces the ferroelectric-ferroelectric phase transition temperatures, but increases the Curie temperatures. The electrocaloric coefficients of tetragonal phase are much larger than that of rhombohedral and monoclinic phase. A negative electrocaloric effect is observed near the MC-T phase transition in 0.69 Pb(Mg1/3Nb2/3)O3-0.31 PbTiO3 single crystal. The application of a strong enough electric field results in a high adiabatic temperature change over a broad range of temperature. Therefore, it would be useful to construct a solid state cooling cycle over a broad temperature range for practical applications. |
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| Keywords: | ferroelectrics electrocaloric effect adiabatic temperature change |
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