Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2419
Title: Synthesis of (Bi,La)(4)Ti3O12 by a new aqueous solution-gel route
Authors: HARDY, An 
MONDELAERS, Dirk 
VAN BAEL, Marlies 
MULLENS, Jules 
VAN POUCKE, Lucien 
VANHOYLAND, Geert 
D'HAEN, Jan 
Issue Date: 2004
Publisher: ELSEVIER SCI LTD
Source: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 24(6). p. 905-909
Abstract: A new aqueous solution-get route. for the synthesis of ferroelectric lanthanum substituted bismuth titanate was developed, based on aqueous Bi3+ - and La3+ -citrate solutions and an aqueous peroxocitrato-Ti(IV) solution. A homogeneous, amorphous precursor gel was prepared by evaporation of the BLT precursor solution. The homogeneity was maintained throughout the entire thermooxidative decomposition of the gel, as shown by TEM measurements on freestanding thin films. This molecular scale mixing and high degree of homogeneity led to the direct crystallization of the Aurivillius phase from the amorphous phase. As a consequence the crystallization temperature was as low as 525 degreesC, which was shown by a high temperature X-ray diffraction study of the stoichiometric precursor. The addition of an excess of Bi3+ decreased the crystallization temperature, but also introduced a Bi2O3 secondary phase. (C) 2003 Elsevier Ltd. All rights reserved.
Notes: Limburgs Univ Ctr, Lab Inorgan, B-3590 Diepenbeek, Belgium. IMOMEC, B-3590 Diepenbeek, Belgium.Mullens, J, Limburgs Univ Ctr, Lab Inorgan, Univ Campus, B-3590 Diepenbeek, Belgium.jules.mullens@luc.ac.be
Keywords: aqueous; electron microscopy; layered perovskites; sol-gel processes; x-ray methods
Document URI: http://hdl.handle.net/1942/2419
ISSN: 0955-2219
e-ISSN: 1873-619X
DOI: 10.1016/S0955-2219(03)00420-5
ISI #: 000189247800002
Category: A1
Type: Journal Contribution
Validations: ecoom 2005
Appears in Collections:Research publications

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