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Title: Formation of BaTiO3 from Barium Oxalate and TiO2
Authors: Bera, J
Sarkar, D
Keywords: BaTio3 synthesis
Crystal morphology
Oxalate-oxide reaction
Reaction kinetics
Issue Date: 2003
Publisher: Kluwer
Citation: Journal of Electroceramics, Vol 11, Iss 3, P 131-137
Abstract: Barium titanate powder has been prepared via a semi-oxalate method that uses barium oxalate and TiO2 precursors, instead of titanyl oxalate. Barium oxalate was precipitated from nitrate solution onto the surface of TiO2 powders. Crystallization of BaTiO3 from the precursors was investigated by TGA, DTA and XRD analysis. It is evident that an intermediate barium oxycarbonate along with BaCO3, forms between 450–500°C and that decomposes to BaCO3 again at high temperature. Decomposition of BaCO3 occurs at much lower temperature, from 600°C onwards, due to the presence of TiO2. The precursor completely transforms into BaTiO3 at 900°C. Nanometer size BaTiO3 crystallites are produced during this synthesis due to the lower calcination temperature. The crystalline morphology of BaTiO3 is controlled mainly by the morphology of BaCO3, which formed in the intermediate stage.
Description: Copyright for this article belongs to Kluwer(now Springer) DOI:10.1023/B:JECR.0000026366.17280.0d
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