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利用水基化学包覆法在纳米钛酸钡粉体包覆氧化铝、二氧化硅和氧化锌等物质,并通过两段式烧结法制备了平均晶粒尺寸120 nm的超细晶钛酸钡基储能陶瓷.包覆层的存在抑制了晶粒生长和异常晶粒长大,同时将陶瓷的交流击穿场强大幅提高至150 kV·cm~(-1)以上,储能密度达到0.829 J·cm~(-3).电子能量损失谱显示,包覆掺杂的元素明显偏聚于陶瓷晶界,形成具有芯-壳结构的晶粒.而高温阻抗谱的测试和拟合结果则进一步解释了陶瓷性能改善的原因.虽然此超细晶陶瓷的储能密度并不十分突出,但其晶粒细小均匀、烧结温度低,因而可用于制备多层陶瓷电容器,从而大幅提高储能密度,这是常见的储能陶瓷无法实现的.
Water-based chemical coating method was used to coat alumina, silica and zinc oxide with nano-barium titanate powder. The ultrafine-crystalline barium titanate with average grain size of 120 nm The existence of coating restrains the grain growth and the abnormal grain growth, at the same time, the field strength of AC breakdown of ceramic is greatly increased above 150 kV · cm -1, the energy storage density reaches 0.829 J · cm -3 .The electron energy loss spectra showed that the cladding-doped elements were significantly segregated on the ceramic grain boundaries to form grains with a core-shell structure.The results of the test and fitting of the high temperature impedance spectra Further explains the reasons for the improvement of the ceramic performance.Although this ultrafine-grained ceramic energy storage density is not very prominent, but its fine grain uniform, low sintering temperature, which can be used for the preparation of multilayer ceramic capacitors, thereby significantly improving the energy storage density , Which is a common energy storage ceramic can not be achieved.