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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/1444

Title: Entirely aqueous solution-gel route for the preparation of (Pb1-xCax)TiO3 thin films
Authors: Bretos, I.
Jimenez, R.
Calzada, M.L.
VAN BAEL, Marlies
HARDY, An
VAN GENECHTEN, Dirk
MULLENS, Jules
Issue Date: 2006
Publisher: AMER CHEMICAL SOC
Citation: CHEMISTRY OF MATERIALS, 18(26). p. 6448-6456
Abstract: In this work, calcium-modified lead titanate (Pb1-xCax)TiO3 (PCT) precursor solutions with different amounts of Ca2+ substituting Pb2+ (x = 0.24 and 0.50) have been prepared for the first time by an entirely aqueous solution-gel route. The use of water as a nonhazardous and inexpensive solvent, together with the easy handling of the technique (no inert atmosphere is required), are the major advantages of this method. A stable citrato-peroxo complex of Ti(IV) was synthesized first and subsequently combined with the Pb2+ and Ca2+ reagents (citrates) in the desired molar ratio to obtain the aqueous precursor solutions. The stability of these solutions with time is slightly influenced by the amount of Ca2+ introduced in the PCT system. Gels were obtained from these solutions and subjected to thermogravimetric analysis coupled on-line to Fourier transform infrared (TGA-FTIR) and mass spectroscopy (TGA-MS) techniques. To prepare thin films, we had to improve the hydrophilicity of the Pt/TiOx/SiO2/Si substrates and hence their wetting by the aqueous solutions using a wet chemical treatment of cleaning. Crystallization of the films was carried out by rapid thermal processing (RTP) in air at 650 degrees C. Films with a single perovskite phase and a homogeneous microstructure were thus obtained, as deduced by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The ability of this solution method to obtain PCT films with ferroelectric and dielectric responses is also demonstrated in the present work.
URI: http://hdl.handle.net/1942/1444
DOI: 10.1021/cm061767e
ISI #: 000242935500054
ISSN: 0897-4756
Category: A1
Type: Journal Contribution
Validation: ecoom, 2008
Appears in Collections: Research publications

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