Abstract
Chromium doped mullite-type ferrite, Bi2(Cr0.1Fe0.9)4O9, is synthesized for the first time by a combined mechanochemical/thermal route. The microstructure of the as-prepared material on the long-range and local atomic scales, revealed by X-ray diffraction and 57Fe Mössbauer spectroscopy, respectively, is found to be quite different from that reported previously. It is shown that the presence of Cr3+ cations in octahedral sites of the orthorhombic structure causes a local distortion of polyhedra in the material. Quantitative information on both the cation distribution and the bond lengths provided is discussed in relation to the derived hyperfine parameters.
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