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A statistical approach to the identification of determinant factors in the preparation of phase pure (Bi,La)4Ti3O12 from an aqueous citrate gel by An Hardy; Geert Vanhoyland; Marlies Van Bael; Jules Mullens; Lucien Van Poucke is a Materials Science article available to read on EtoBox.

What is A statistical approach to the identification of determinant factors in the preparation of phase pure (Bi,La)4Ti3O12 from an aqueous citrate gel about?

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, Bi 12 TiO 20 . 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 Bi 12 TiO 20 . Furthermore, the precursor stoichiometry and cooling rate as well as the calcination atmosphere and crystallization time turned out to interact.

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Author

An Hardy; Geert Vanhoyland; Marlies Van Bael; Jules Mullens; Lucien Van Poucke

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)