고에너지 볼밀링된 BaCO3와 TiO2 혼합분말의 고상반응에 의한 나노결정 BaTiO3 분말 합성
Synthesis of Nanocrystalline BaTiO3 Powder by the Combination of High Energy Ball Milling of BaCO3-TiO2 Mixture and Solid-State Reaction
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Nanocrystalline BaTiO3 powder could be synthesized by solid-state reaction using the mixture which was prepared by a high energy milling process in a bead mill for BaCO3 and nanocrystalline TiO2 powders mixture. Effect of the milling time on the powder characteristic of the synthesized BaTiO3 powder was investigated. Nanocrystalline BaTiO3 with a particle size of 50 nm was obtained at 800oC. High tetragonal BaTiO3 powder with a tetragonality(=c/a)of 1.009 and a specific surface area of 7.6 m2/g was acquired after heat-treatment at 950oC for 2 h. High energy ball milling was effective in decreasing the reaction temperature and increasing the tetragonality.
Abstract
Nanocrystalline BaTiO3 powder could be synthesized by solid-state reaction using the mixture which was prepared by a high energy milling process in a bead mill for BaCO3 and nanocrystalline TiO2 powders mixture. Effect of the milling time on the powder characteristic of the synthesized BaTiO3 powder was investigated. Nanocrystalline BaTiO3 with a particle size of 50 nm was obtained at 800oC. High tetragonal BaTiO3 powder with a tetragonality(=c/a)of 1.009 and a specific surface area of 7.6 m2/g was acquired after heat-treatment at 950oC for 2 h. High energy ball milling was effective in decreasing the reaction temperature and increasing the tetragonality.
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