Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 31, Issue 16, Pages 3047-3053Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.03.018
Keywords
Ferrites; Perovskites; Powders-solid state reaction; Diffusion couples; Microstructure
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The obtaining of multiferroic BiFeO3 as a pure single-phase product is particularly complex since the formation of secondary phases seems to be unavoidable. The process by which these secondary impurities are formed is studied by analyzing the diffusion and solid state reactivity of the Bi2O3-Fe2O3 system. Experimental evidence is reported which indicates that the progressive diffusion of Bi3+ ions into the Fe2O3 particles governs the solid state synthesis of the perovskite BiFeO3 phase. However a competition is established between the diffusion process which tends to complete the formation of BiFeO3, and the crystallization of stable Bi2Fe4O9 mullite crystals, which tend to block that formation reaction. (C) 2011 Elsevier Ltd. All rights reserved.
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