期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 94, 期 10, 页码 3286-3290出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1551-2916.2011.04543.x
关键词
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资金
- National Science fund for distinguished young scholars [50625204]
- Science Fund for Creative Research Groups [50921061]
- Ministry of Sciences and Technology of China [2009CB623301]
- outstanding tutors for doctoral dissertations of S&T project in Beijing [YB20081000302]
- Samsung Electro-Mechanics Co., Ltd.
High and large capacitance base-metal-electrode multilayer ceramic capacitors (BME MLCCs) for future application require much thinner dielectric layers (<1 mu m) than ever before, which means that grain size uniformity of BME MLCC powder should be effectively controlled. In this paper, high-performance nanosized BME MLCC powder was developed by a novel and convenient aqueous chemical coating method. Various kinds of dispersants were used to disperse BaTiO(3) particles in aqueous solutions. Poly(acrylic acid-comaleic acid) was found to be the best for dispersing. BaTiO(3) particles were well coated by adding the doping elements into the uniform BaTiO(3) slurry in the form of inorganic solutions and organic solutions under an appropriate pH value. Thermogravimetric analysis, transmission electron microscopy, and energy-dispersive spectroscopy were utilized in the study of calcining, microstructures, and element analysis. The dielectric constants of the ceramics at room temperature could reach 2100, with low dielectric loss <1.0% and high insulation resistivity similar to 10(12) Omega.cm. The average grain size is as low as about 130 nm.
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