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Influence of Zinc Doping on the Structural and Magnetic Properties of α-Fe2O3

✍ Scribed by Ibrar Ayub; Frank J. Berry; Robert L. Bilsborrow; Örn Helgason; Roberto C. Mercader; Elaine A. Moore; Silvana J. Stewart; Paul G. Wynn

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
175 KB
Volume
156
Category
Article
ISSN
0022-4596

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✦ Synopsis

Zinc-doped -Fe 2 O 3 has been prepared by hydrothermal methods. The zinc K-edge EXAFS and interatomic potential calculations indicate that Zn 2؉ ions substitute for Fe 3؉ ions in the lattice and are accompanied by oxygen vacancies. The 57 Fe MoK ssbauer spectra recorded between 296 and 18 K demonstrate that the Morin transition in -Fe 2 O 3 is completely suppressed within this temperature range by the presence of zinc. The 57 Fe MoK ssbauer spectra recorded in situ at temperatures between 300 and 915 K show the material to undergo conversion to the spinelrelated ZnFe 2 O 4 phase in this temperature regime. The results demonstrate that the structural and magnetic properties of zincdoped -Fe 2 O 3 and its behavior at elevated temperatures are di4erent from those of magnesium-doped -Fe 2 O 3 .

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