Abstract
AbstractBi2Fe4O9was synthesized using a polyol-mediated method. X-ray powder diffraction (XRPD) revealed that the as-synthesized sample is nano-crystalline. During heating, the X-ray amorphous powder transformed into a rhombohedral perovskite-type bismuth ferrate followed by a second transformation into mullite-type Bi2Fe4O9at higher temperatures. This transformation was studied atin-situconditions by temperature-dependent XRPD and57Fe Mössbauer spectroscopy. The57Fe Mössbauer spectra indicate the existence of two Fe3+species at two different octahedrally coordinated sites leading to the conclusion that the as-synthesized powder of the polyol synthesis possesses a disordered (Bi1–xFex)FeO3perovskite structure. Rietveld refinements have unambiguously supported this observation and this results suggest that one third of the Bi3+sites are substituted by Fe3+representing the initial chemical composition. This study has shown that as-synthesized nano-materials are not always similar to the respective micro-crystalline ones.
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