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Spinel ferrites MPr0.1Fe1.9O4 (M = Mn, Cu, Mg) were prepared by sol-gel technique. X-ray Diffraction (XRD) showed that along with spinel phase, secondary phase (PrFeO3) appeared for all composition. Scanning electron microscopy showed the inhomogeneous grain size. Temperature dependence normalized AC susceptibility and Curie temperature of spinel ferrites revealed that in all the samples transitions...
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