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Hydrothermal Synthesis for Large Barium Titanate Powders at a Low Temperature: Effect of Titania Aging in an Alkaline Solution
Author(s) -
Lee Hyo Seok,
Lee Jai Joon,
Chang Tae Sun,
Kim Jeong Wook,
Koo Sang Man
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01828.x
Subject(s) - calcination , barium titanate , hydrothermal circulation , materials science , barium hydroxide , chemical engineering , titanate , hydrothermal synthesis , dispersity , hydroxide , mineralogy , hydrolysis , porosity , barium , inorganic chemistry , composite material , ceramic , metallurgy , chemistry , catalysis , polymer chemistry , organic chemistry , engineering
Monodisperse and spherical barium titanate (BaTiO 3 ) powders with diameters of 200–470 nm were directly prepared by a low‐temperature hydrothermal method at 90°C. Spherical titania (TiO 2 ) 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 BaTiO 3 without a morphological change. The aging step of the TiO 2 , where the surface of TiO 2 was highly densified through elimination of the pores, was indispensable to retain the sizes and shapes of TiO 2 in the resulting BaTiO 3 . This was due to the fact that the formation of BaTiO 3 proceeded by an in situ reaction mechanism. The resulting BaTiO 3 powders exhibited dense and nonporous structures even after calcination at 1000°C.