Influence of zinc doping on the structural and magnetic properties of alpha-Fe2O3

Ayub, Ibrar; Berry, Frank J.; Bilsborrow, Robert L.; Helgason, Orn; Mercader, Roberto C.; Moore, Elaine A.; Stewart, Silvana J. and Wynn, Paul G. (2001). Influence of zinc doping on the structural and magnetic properties of alpha-Fe2O3. Journal of Solid State Chemistry, 156(2) pp. 408–414.



Zinc-doped alpha-Fe2O3 has been prepared by hydrothermal methods. The zinc K-edge EXAFS and interatomic potential calculations indicate that Zn2+ ions substitute for Fe3+ ions in the lattice and are accompanied by oxygen vacancies. The 57Fe Mossbauer spectra recorded between 296 and 18 K demonstrate that the Morin transition in alpha-Fe2O3 is completely suppressed within this temperature range by the presence of zinc. The 57Fe Mossbauer soectra recorded in situ at temperatures between 300 and 915 K show the material to undergo conversion to the spinel-related ZnFe2O4 phase in thgis temperature regime. The results demonstrate that the structural and magnetic properties of zinc-doped alpha-Fe2O3 and its behaviour at elevated temperatures are different from those of magnesium-doped alpha-Fe2O3.

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