Investigations on Bi25FeO40 powders synthesized by hydrothermal and combustion-like processes

Bi25FeO40 powders were prepared by a hydrothermal method and a combustion process. The optical band gaps and the peritectic point were determined. The magnetic behaviour was investigated depending on the synthesis and the initial Bi/Fe ratios. The influence of amorphous iron-oxide on the magnetic properties was examined.