Grain size effect and microstructure influence on the energy storage properties of fine‐grained BaTiO3‐based ceramics |
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| Authors: | Baibo Liu Xiaohui Wang Ruoxi Zhang Longtu Li |
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| Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;2. School of Finance, Capital University of Economics and Business, Beijing, China |
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| Abstract: | The dependence of energy storage properties on grain size was investigated in BaTiO3‐based ferroelectric ceramics. Modified BaTiO3 ceramics with different grain size were fabricated by two‐step sintering method from BaTiO3 powders doped with Al2O3 and SiO2 by aqueous chemical coating. For samples doped with ZnO sintering aid in addition to Al2O3‐SiO2, the density and breakdown strength increased significantly. In general, samples with smaller grains have lower polarization but higher energy storage efficiency. Al2O3‐SiO2‐ZnO‐doped samples with average grain size of 118±2 nm have an energy density of 0.83±0.04 J/cm3. Obvious segregation of doping elements in second phase and grain boundary was observed by TEM‐EDS. Impedance spectroscopy further explains the relationship between microstructure and properties. Compared to common energy storage ceramics, the grain size of this low‐cost ceramics sintered at relatively low temperature is small, and the pilot scale production has been well completed. All these features make the utilization in multilayer devices and industrial mass production possible. In addition, the obtained rules are helpful in further development of energy storage ceramics. |
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| Keywords: | barium titanate coatings grain size |
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