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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 1
BKCSDE 32(1)
January 20, 2011

Title	Low-temperature Synthesis of Highly Crystalline Ba_xSr_1-xTiO₃ Nanoparticles in Aqueous Medium
Author	Yong Joo Kim, Sher Bahadur Rawal, Sang Do Sung, Wan In Lee*
Keywords	Barium strontium titanate, Nanoparticles, Tetrametylammonium hydroxide, Sol-gel, Low-temperature synthesis
Abstract	We report the synthesis of SrTiO₃, BaTiO₃ and Ba_xSr_1-xTiO₃ (BST) nanoparticles (NPs) in various compositions (x = 0.25, 0.5 and 0.75) by an inorganic sol-gel method under a basic condition. Highly crystalline nanoparticles were formed at the reaction temperature of 25 - 100 ^oC from a stabilized titanium alkoxide in tetramethylammonium hydroxide (TMAH) and barium or strontium acetate in aqueous solution. Morphology and particle structure of the synthesized BST NPs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The BST nanoparticles in various compositions were monodispersed without mutual aggregation, and their average sizes were in the range of 70 - 80 nm. Furthermore, they showed highly crystallized perovskite phase over the whole composition range from SrTiO₃ to BaTiO₃. We also proposed a mechanism for the low-temperature formation of BST NPs.
Page	141 - 144
Full Text	PDF

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