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Received January 18, 2005
Accepted June 30, 2005
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분무열분해 공정에 의해 합성된 바륨 티타네이트 분말의 결정화 및 형태 특성
Characteristics of Crystallinity and Morphology of Barium Titanate Particles Prepared by Spray Pyrolysis
1한국화학연구원 화학소재부, 305-343 대전시 유성구 장동 100 2연세대학교 화학공학과, 120-749 서울시 서대문구 신촌동 1347 3건국대학교 화학공학과, 143-701 서울시 광진구 화양동 1
1Advanced Materials Division, Korea Research Institute of Chemical Technology, 100, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea 2Department of Chemical Engineering, Yonsei University, 134, Shinchon-dong, Sodaemoon-gu, Seoul 120-749, Korea 3Department of Chemical Engineering, Konkuk University, 1, Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea
Korean Chemical Engineering Research, August 2005, 43(4), 517-524(8), NONE Epub 27 September 2005
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Abstract
유기 첨가물을 함유하는 분무용액으로부터 분무열분해 공정에 의해 바륨 티타네이트(BaTiO3) 분말을 합성하였다. 분무용액에 첨가되는 유기물의 종류 및 첨가량이 분무열분해 공정에 의해 합성된 BaTiO3 분말들의 결정구조 및 형태 특성에 미치는 영향을 조사하였다. 유기 첨가물로서 구연산, 에틸렌 글리콜 및 폴리에틸렌 글리콜을 첨가한 경우에 있어서는 유기 첨가물의 종류에 따라 하소 전후에 서로 다른 형태의 BaTiO3 분말들이 얻어졌다. 분무용액에 구연산을 첨가한 경우에 합성된 BaTiO3 분말들은 하소 후에 균일한 크기의 나노 분말들로 구성 되어진 나노 구조체를 가졌다. 분무용액에 첨가된 구연산의 양이 증가할수록 하소 후에 얻어진 분말들의 결정구조가 준안정상인 입방정상에서 정방 정상으로의 상변환성이 증가하였다. 고농도의 구연산을 함유한 분무용액으로부터 합성된 BaTiO3 분말들은 하소 후에 좋은 정방정계 결정구조, 균일하며 미세한 크기 및 고표면적을 가졌다. 분무열분해 공정에 의해 합성된 BaTiO3 분말들은 밀링 공정 후에 균일한 크기 및 형태를 가졌다.
Barium titanate (BaTiO3) particles were prepared by spray pyrolysis from spray solution containing organic additives. The effects of the type and amount of organic precursors on the crystal structure and morphology of the BaTiO3 particles were investigated. It was found that the morphology of BaTiO3 particles before and after calcination depended on the type of organic additives such as citric acid, ethylene glycol and polyethylene glycol. Among these organic additives, citric acid was the most effective to prepare BaTiO3 particles with nano-structured morphology consisting with uniform size nanometer particles after calcination. It was also found that the phase transformability of the metastable cubic phase to the tetragonal one during calcination could be improved by increasing the content of citric acid in the spray solution. As a result, BaTiO3 particles prepared from spray solution containing high concentration of citric acid had good tetragonality, uniform and fine size, and high BET surface area after calcination. BaTiO3 particles prepared by spray pyrolysis had nanometer size and uniform morphology after simple ball milling process.
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