Abstract
57Fe Mössbauer spectra recorded in situ in vacuo from chromium- and gallium-doped Fe3O4 at elevated temperatures show the dopant ions to depress the Curie temperature of Fe3O4 by ca. 70 K. Spectra recorded from aluminium-doped γ-Fe2O3 show the onset of conversion to aluminium-doped α-Fe2O3 to begin at ca. 750 K, which is ca. 100 K above the conversion temperature for undoped γ-Fe2O3. The variation in magnetic hyperfine fields at temperatures exceeding ca. 750 K is similar to that recorded from α-Fe2O3 when doped with zinc or magnesium. At temperatures exceeding 900 K the zinc doped α-Fe2O3 partially converts to spinel-related ZnFe2O4.
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Ayub, I., Berry, F.J. & Helgason, Ö. Iron-57 Mössbauer Spectroscopic Studies of the High Temperature Properties of Metal-Doped Iron Oxides. Hyperfine Interactions 139, 579–587 (2002). https://doi.org/10.1023/A:1021274812398
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DOI: https://doi.org/10.1023/A:1021274812398