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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 

Low-temperature Synthesis of Highly Crystalline BaxSr1-xTiO3 Nanoparticles in Aqueous Medium
Yong Joo Kim, Sher Bahadur Rawal, Sang Do Sung, Wan In Lee*
Barium strontium titanate, Nanoparticles, Tetrametylammonium hydroxide, Sol-gel, Low-temperature synthesis
We report the synthesis of SrTiO3, BaTiO3 and BaxSr1-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.
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