Electrocaloric behavior and piezoelectric effect in relaxor NaNbO3-based ceramics |
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Authors: | Hong Tao Junlin Yang Xiang Lv Xihong Hao Jiagang Wu |
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Affiliation: | 1. Department of Materials Science, Sichuan University, Chengdu, China;2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, China |
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Abstract: | We firstly reported the electrocaloric properties in relaxor (1?x?y)NaNbO3–yBaTiO3–xCaZrO3 ceramics, and high electrocaloric effect (?T ~0.451 K and∣?T/?E∣~0.282 Km/MV) can be realized in the ceramics (x = 0.04 and y = 0.10) under low temperature and low electric field. Relaxor behavior of NaNbO3 ceramics can be found by doping both BaTiO3 and CaZrO3. In addition, optimized piezoelectric effects (d33 ~235 pC/N and d33* ~230 pm/V) can be observed in the ceramics (x = 0.04 and y = 0.10) due to the involved morphotropic phase boundary (MPB). Excellent piezoelectric effect (ie, d33~330 pm/V at 41°C, and d33*~332 pm/V at 60°C) can be found because of the characteristics of MPB. Good temperature reliability of piezoelectric effect can be shown because of both MPB and relaxor behavior. We believe that the ceramics with high electrocaloric effect and good piezoelectric effect can be considered as one of the most promising lead-free materials for piezoelectric devices. |
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Keywords: | electrocaloric effect MPB NaNbO3 piezoelectric effect |
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