Abstract
The influence of gallium substitution on the chemical and structural properties of haematite, α-Fe2O3, has been studied using X-ray diffraction and57Fe Mossbauer spectroscopy. The presence of only α-(Ga x Fe1−x)2O3 phase is detected for the compositions withx between 0.01 and 0.90. A gradual decrease of the unit-cell parameters of α-(Ga x Fe1−x)2O3 with the increase of gallium substitution is measured.57Fe Mossbauer spectra showed that the value of the magnetic hyperfine field of pure α-Fe2O3 decreases with increasing gallium for iron substitution. The hyperfine magnetic structure, which is observed for α-(Ga x Fe1−x)2O3 at room temperature, collapsed for the composition withx≃0.50. The changes in the57Fe Mossbauer spectra of the α-(Ga x Fe1−x)2O3 phase are discussed in the sense of the electronic relaxation and the superparamagnetic effects.
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