期刊
CERAMICS INTERNATIONAL
卷 46, 期 2, 页码 1343-1351出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.09.097
关键词
Phase-transition; Electrostrain; Energy storage; Electrocaloric effect
资金
- National Natural Science Foundation of China [51402196]
- Guangxi Natural Science Foundation [2016GXNSFCB380006, 2017GXNSFFA198015]
- National College Students' Innovative Entrepreneurial Training Plan Program [201810593073]
- Innovation Project of Guangxi Graduate Education [YCSW2019049]
((Bi0.5Na0.5TiO3)(0.88)-(BaTiO3)(0.12))((1-x))-(LiNbO3)(x) = 0.0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, and 0.07; abbreviated as LiNbO3-doped BNT-BT) ceramics possessing many excellent performances (large electrostrain, negative electrocaloric effect and energy storage density with high efficiency) was fabricated by the conventional solid-state reaction method. A large electrostrain (maximum similar to 0.34% at 100 kV/cm and room temperature) with high thermal stability over a broad temperature range (similar to 80 K) is obtained at x = 0.03. A large energy storage density (maximum W energy similar to 0.665 J/cm(3) at 100 kV/cm and room temperature) with a high efficiency (eta similar to 49.3%) is achieved at x = 0.06. Moreover, a large negative electrocaloric (EC) effect (maximum Delta T similar to 1.71 K with Delta S 0.22 J/(K kg) at 70 kV/cm)) is also obtained at x = 0.04. Phase transition (from ferroelectric to antiferroelectric and then to relaxor) induced by increasing the doping amount of LiNbO3 plays a very key role on the optimization of these performances. These findings and breakthroughs make the LiNbO3-doped BNT-BT ceramics very promising candidates as multifunctional materials.
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