Abstract
The oxidation-reduction mechanism in Mn-Zn ferrites Mn xZn yFe 2.044O 4 with O <x+y <1, prepared by a standard ceramic route was investigated in the temperature range 3OO–7OO°C. X-ray diffraction analysis and thermogravimetry measurements have enabled us to state iron and manganese ions distribution in the spinel lattice which is given by the formula: (Mn 0.8x 2+Zn 2+ yFe 3+ 1−0.8x−y) A(Fe 3+ 1+0.6x+yFe 2+ 1−0.8x−yMn 3+ 0.2y) BO 2− 4 Below about 45O°C, these ferrites are oxidized in cation deficient spinels but the oxidation depends highly on oxygen pressure. With increasing temperature further oxidation of Mn 2+-ions results in the appearance of α-Fe 2O 3 accompanied by a defect spinel phase due to zinc presence.
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