Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/938
Title: Synthesis of strontium bismuth niobate (SrBi2Nb2O9) using an aqueous acetate-citrate precursor gel: thermal decomposition and phase formation
Authors: NELIS, Daniel 
MONDELAERS, Dirk 
VANHOYLAND, Geert 
HARDY, An 
VAN WERDE, Kristof 
VAN DEN RUL, Heidi 
VAN BAEL, Marlies 
MULLENS, Jules 
VAN POUCKE, Lucien 
D'HAEN, Jan 
Issue Date: 2005
Publisher: ELSEVIER SCIENCE BV
Source: Thermochimica Acta, 426(1-2). p. 39-48
Abstract: An aqueous solution–gel route was developed for the preparation of the ferroelectric material strontium bismuth niobate (SrBi2Nb2O9, SBN). Starting from aqueous Bi3+-acetate and Sr2+-acetate solutions and an aqueous peroxo-citrato-Nb5+-precursor solution, this method offers a low-cost and environmentally friendly alternative to the conventional sol–gel techniques. With regard to the deposition of thin films, it is important to gain insight in the behaviour of the precursor during thermal treatment. For this reason the thermal decomposition mechanism of the precursor gel was studied: weight loss and evolved gases were characterized by (hyphenated) TGA–MS and TGA–FTIR, while changes in the solid state during heating were detected using high temperature diffuse reflectance infrared fourier transform spectroscopy (HT-DRIFT). The decomposition in dry air can be divided in four temperature regions. The first two steps are ascribed to the drying of the sample and to the decomposition of the organic matrix, not coordinated to the metal ions. During the third step the coordination sphere of the metal ions is decomposed and finally the residual organic matter is combusted in the fourth region. TEM experiments on freestanding thin films showed that the precursor homogeneity was maintained throughout the entire thermo-oxidative decomposition of the gel. The phase formation of SBN was studied by means of high temperature X-ray diffraction (HT-XRD). At about 425 °C the intermediate fluorite phase is crystallized out of the amorphous precursor. The phase transformation into the desired ferroelectric perovskite phase seems to be dependent on the Bi-content: an excess of Bi lowers the onset temperature of perovskite formation.
Keywords: Metal Oxide nanomaterials;Physical Analysis and Characterisation
Document URI: http://hdl.handle.net/1942/938
ISSN: 0040-6031
e-ISSN: 1872-762X
DOI: 10.1016/j.tca.2004.07.005
ISI #: 000226887500006
Category: A1
Type: Journal Contribution
Validations: ecoom 2006
Appears in Collections:Research publications

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