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Characteristics of Crystallinity and Morphology of Barium Titanate Particles Prepared by Spray Pyrolysis  

Lee, Kyo Kwang (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Jung, Kyeong Youl (Advanced Materials Division, Korea Research Institute of Chemical Technology)
Kim, Jung Hyun (Department of Chemical Engineering, Yonsei University)
Koo, Hye Young (Department of Chemical Engineering, Konkuk University)
Ju, Seo Hee (Department of Chemical Engineering, Konkuk University)
Kang, Yun Chan (Department of Chemical Engineering, Konkuk University)
Publication Information
Korean Chemical Engineering Research / v.43, no.4, 2005 , pp. 517-524 More about this Journal
Abstract
Barium titanate ($BaTiO_3$) 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 $BaTiO_3$ particles were investigated. It was found that the morphology of $BaTiO_3$ 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 $BaTiO_3$ 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, $BaTiO_3$ 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. $BaTiO_3$ particles prepared by spray pyrolysis had nanometer size and uniform morphology after simple ball milling process.
Keywords
Nanoparticle; Barium Titanate; Spray Pyrolysis; Tetragonality;
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