Hydrothermal synthesis for large barium titanate powders at a low temperature: Effect of titania aging in an alkaline solution

Hyo Seok Lee, Jai Joon Lee, Tae Sun Chang, Jeong Wook Kim, Sang Man Koo

Research output: Contribution to journalArticle

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Abstract

Monodisperse and spherical barium titanate (BaTiO3) powders with diameters of 200-470 nm were directly prepared by a low-temperature hydrothermal method at 90°C. Spherical titania (TiO2) powders, ranging in size from 150 to 420 nm, were initially prepared by a controlled hydrolysis and condensation reaction, aged in a highly alkaline solution for 12 h, and then hydrothermally reacted with barium hydroxide to be converted to BaTiO3 without a morphological change. The aging step of the TiO 2, where the surface of TiO2 was highly densified through elimination of the pores, was indispensable to retain the sizes and shapes of TiO2 in the resulting BaTiO3. This was due to the fact that the formation of BaTiO3 proceeded by an in situ reaction mechanism. The resulting BaTiO3 powders exhibited dense and nonporous structures even after calcination at 1000°C.

Original languageEnglish
Pages (from-to)2995-2997
Number of pages3
JournalJournal of the American Ceramic Society
Volume90
Issue number9
DOIs
StatePublished - 2007 Sep 1

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