Nano-sized Ag–BaTiO3 composite powders with various amount of Ag prepared by spray pyrolysis |
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Authors: | You Na Ko Seung Ho Choi Yun Chan Kang |
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Affiliation: | Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Republic of Korea |
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Abstract: | The preparation of precursors of BaTiO3 nanopowders with various amounts of Ag by spray pyrolysis is reported. The precursor powders obtained with hollow and thin-wall particles are composed of uniformly dispersed Ba, Ti, and Ag components. After post-treatment and a simple milling process, the precursor powders, irrespective of the amount of Ag, are transformed into Ag–BaTiO3 composite nanoparticles. The mean particle size of the Ag (10 mol%)–BaTiO3 powders is 142 nm. BaTiO3 pellets containing Ag exhibit dense structures even at a low sintering temperature of 1000 °C. BaTiO3 pellets with 10 mol% Ag show the highest dielectric constant of 2950, as opposed to the pure BaTiO3 pellets (without Ag), whose dielectric constant is 1827. |
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