Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2418
Title: A statistical approach to the identification of determinant factors in the preparation of phase pure (Bi,La)(4)Ti3O12 from an aqueous citrate gel
Authors: HARDY, An 
VANHOYLAND, Geert 
VAN BAEL, Marlies 
MULLENS, Jules 
VAN POUCKE, Lucien 
Issue Date: 2004
Publisher: ELSEVIER SCI LTD
Source: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 24(9). p. 2575-2581
Abstract: The factors influencing crystallization of layered-perovskite lanthanum substituted bismuth titanate, starting from an aqueous metal-chelate precursor-gel, were identified by means of statistically designed experiments. To ensure experimental economy and efficiency in spite of the large number of factors possibly affecting the phase purity, a fractional factorial design was chosen. The calcination atmosphere turned out to be the most important to avoid the formation of the Sillenite secondary phase, Bi12TiO20. In order to study its impact on phase purity thoroughly an extensive number of ambient compositions were tested. These tests showed that dry air is the optimal composition. Precursor stoichiometry and gas flow rate during heat treatment also significantly influenced the formation of Bi12TiO20. Furthermore, the precursor stoichiometry and cooling rate as well as the calcination atmosphere and crystallization time turned out to interact. (C) 2003 Elsevier Ltd. All rights reserved.
Notes: Limburgs Univ Ctr, Lab Inorgan & Phys Chem, B-6590 Diepenbeek, Belgium.Mullens, J, Limburgs Univ Ctr, Lab Inorgan & Phys Chem, B-6590 Diepenbeek, Belgium.jules.mullens@luc.ac.be
Keywords: perovskites; powders-chemical preparation; sol-gel processes; statistical design; X-ray methods; (Bi,La)(4)Ti3O12
Document URI: http://hdl.handle.net/1942/2418
ISSN: 0955-2219
e-ISSN: 1873-619X
DOI: 10.1016/j.jeurceramsoc.2003.09.018
ISI #: 000222117300004
Category: A1
Type: Journal Contribution
Validations: ecoom 2005
Appears in Collections:Research publications

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