Abstract
(Fe2O3)x⋅(P2O5)40⋅(ZnO)60−x glass ceramics containing different concentrations of Fe2O3 ranging from 1 to 20 mol% were obtained by heat treatment of glass samples at 650 °C for 2 h. The structural and magnetic properties of these glass ceramics were investigated by means of electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. The EPR spectra of the studied samples revealed absorptions centered at g ≈ 2.0 and 4.3. The compositional variations of the intensity and line width of these absorption lines was interpreted in terms of the variation in Fe3+ and Fe2+ ions concentration in the glass ceramics as well as the interaction between the iron ions. The magnetic susceptibility data evidenced the presence of both Fe3+ and Fe2+ ions, with their relative content depending on the Fe2O3 concentration. Dipolar and superexchange interactions involving iron ions were revealed depending on the iron content of the sample.
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