Abstract
Mn/sup 3+/ substituted orthoferrites TbFe/sub 1-x/Mn/sub x/O/sub 3/ (x=0.00,0.25,0.50, and 0.75) nanoparticles were prepared by the sol-gel method. The crystallographic and magnetic properties of powders were characterized by using X-ray diffractometer (XRD), Mossbauer spectroscopy, and scanning electron microscopy (SEM). The crystal structure was found to be a single phase of orthorhombic structure (Pbnm). For Mo/spl uml/ssbauer spectra, we have fitted the spectra to a model based on a random distribution of Fe and Mn ions on the octahedral sites. Mossbauer spectroscopy measurement showed that Neel temperature decrease with increasing Mn concentration x. The isomer shift indicate that the valance state of Fe ions is ferric (Fe/sup 3+/). The result of SEM measurements showed that powders present average particle size of 36.5 nm for TbFe/sub 0.25/Mn/sub 0.75/O/sub 3/.
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