BiFeO3 syntheses on the basis of fuel precursors on the solar furnace
Abstract
Synthesis and properties of bismuth ferrite BiFeO3 are investigated quite widely [1-17].
However, obtaining a single-phase sample of BiFeO3 still presents a serious problem. For
example, a material synthesized from a mixture of Bi2O3 + Fe2O3 always contains Bi25FeO39
and Bi2Fe4O9 impurities, not depending on the synthesis method [5-8]. The use of a mixture
with a large excess of Bi2O3 also did not lead to a single-phase BiFeO3 ferrite [9]. The
complexity of preparation of single-phase BiFeO3 is noted in [10], which is associated with the
features of the Bi2O3-Fe2O3 system state diagram (the presence of three compounds), the
Bi2O3 volatility above its melting point [11] and the thermodynamic instability of BiFeO3 in air
in the absence of an equilibrium solution of Bi2O3-Fe2O3 melt [12]. An analysis of the literature
data shows the impossibility of obtaining a single-phase compound BiFeO3 by solid-phase
synthesis [13-17].
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