Vacancy ordering in γ-Fe2O3 small particles |
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Authors: | K Haneda AH Morrish |
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Institution: | Department of Physics, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2 |
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Abstract: | The effect of particle size on the formation of vacancy-ordered superstructure in γ-Fe2O3 powders has been investigated by using X-ray, Mössbauer and chemical analyses. Powders of γ-Fe2O3 with different average particle size were prepared by chemical precipitation and subsequent heat-treatment. The X-ray diffraction intensity of the superlattice lines decreases with the particle size of γ-Fe2O3 and finally disappears at a particle-size between 300-175 Å, possibly around 200 Å. Therefore ordering of the cation vacancies in ultrafine γ-Fe2O3 particles is ruled out. Although the vacancies do not form an ordered structure, they do exclusively occupy B-sites. |
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