Large electrocaloric effect in lead-free Ba(ZrxTi1-x)O3 thick film ceramics
| Autor: | Bo Liang, Xiao-Dong Jian, Sheng-Guo Lu, Tao Tao, Dan-Dan Li, Yingbang Yao, Biao Lu |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Mechanical Engineering Metals and Alloys Ionic bonding 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Isothermal process Titanate Mechanics of Materials visual_art Electric field 0103 physical sciences Materials Chemistry visual_art.visual_art_medium Electrocaloric effect Ceramic Maxwell relations 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 742:165-171 |
| ISSN: | 0925-8388 |
| Popis: | Barium zirconate titanate (Ba(ZrxTi1-x)O3) thick film ceramics were prepared using a tape-casting method. Their structures, morphologies, and electric properties were characterized using XRD, SEM and impedance analysis approaches, respectively. The electrocaloric effects (ECE), i.e., isothermal entropy changes and adiabatic temperature changes, were calculated using a Maxwell relation. It was confirmed by XRD and SEM that the obtained thick film ceramics are pure and dense perovskite structures. The dielectric analyses indicate that the Ba(ZrxTi1-x)O3 thick film ceramics show characteristics of transition from normal to relaxor ferroelectrics with the increasing Zr4+ ionic content. The polarization – electric field (P-E) hysteresis loops reveal larger polarizations and the ceramics can withstand an electric field as high as 12 MV/m. The adiabatic temperature changes ΔT calculated via the Maxwell relation and the polarization as a function of temperature, which is extracted from the P-E hysteresis loops measured at 12 MV m−1 are from 3.7 to 0.28 K with the increasing Zr4+ ionic content. |
| Databáze: | OpenAIRE |
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