Abstract
Magnetic properties of γ-Fe 2- y Al y O 3 reveal thedependence of vacancy ordering and Al-ions distribution on the origin of aluminium substituted maghemites. X-ray, infrared, DTA and room-temperature saturation magnetization characteristics of the γ-(Fe, Al) 2 O 3 solid solution series obtained during oxidation of aluminium substituted magnetites have been compared with similar features of Al-maghemites produces by dehydroxylation of aluminium substituted lepidocrocites. It has been found that the limit of formation of solid solution in both cases lies at about y=0.2. Comparison of changes in saturation magnetization with the increase of Al-content in both series suggests that about 20% of aluminium ions and 5% of vacancies are located on tetrahedral sites in the ordered Al-maghemites obtained from Al-magnetites, whereas the total incorporation of aluminium in the octahedral sublattice was found for disordered Al-maghemites stemming from γ-(Fe, Al)OOH.
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