Abstract
The obtaining of multiferroic BiFeO 3 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 Bi 2O 3–Fe 2O 3 system. Experimental evidence is reported which indicates that the progressive diffusion of Bi 3+ ions into the Fe 2O 3 particles governs the solid state synthesis of the perovskite BiFeO 3 phase. However a competition is established between the diffusion process which tends to complete the formation of BiFeO 3, and the crystallization of stable Bi 2Fe 4O 9 mullite crystals, which tend to block that formation reaction.
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