Anisotropic field induced phase transitions and negative electrocaloric effect in rhombohedral Mn doped Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 single crystals |
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Authors: | Yaming Zhou Qiang Li Fangping Zhuo Qingfeng Yan Yiling Zhang Xiangcheng Chu |
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Affiliation: | 1. Department of Chemistry, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China |
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Abstract: | The electrocaloric effect (ECE) of Mn doped Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT:Mn) single crystals with particular emphasis on the impact of crystallographic orientations and phase transitions were investigated systematically. Orientation-dependent phase transitions have been demonstrated by the dielectric and strain behaviors. Intriguingly, the negative ECE of –0.02?°C and –0.002?°C were obtained firstly in 001]-oriented PIN-PMN-PT:Mn crystals near the rhombohedral→tetragonal phase transformation and in 011]-oriented crystals near the rhombohedral→orthorhombic phase transformation, respectively. However, only the positive ECE was found in 111]-oriented crystals near the tetragonal→rhombohedral phase transition. Additionally, the maximum ECE temperature changes calculated in 001]-, 011]- and 111]-oriented crystals were 0.33?°C, 0.46?°C and 0.38?°C, respectively. Our results suggest that the negative ECE is attributed to electric field-induced phase transitions, whose critical field decreases with the increase of temperature. The phase transition-mediated coexistence of positive and negative effects in the relaxor-ferroelectric single crystals is beneficial to enhance the efficiency of the solid-state cooling devices. |
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Keywords: | Negative electrocaloric Anisotropic Ferroelectric Phase transition |
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