Abstract:
Ultrafine powders of Nd sup(+3) doped Mn-Zn ferrite powders with composition Mn sub(0.65)Zn sub(0.35)Fe sub(2-x)Nd sub(x)O sub(4 (x=0.04, 0.06, 0.08) were prepared using combustion method of preparation. Monophasic nanoparticle formation was confirmed by X-ray diffraction. The particle size was determinedusing Transmission electron microscope (TEM). The nanopowders were investigated for their physical, structural and magnetic properties and then radiated with gamma photons obtained from Co sup(60) source with a dose of 500Gy, 750Gy and 1000Gy. The characterization of radiated powders showed preservation of spinel structure with breaking down of crystallites into finer crystals with increment in amorphous content. Structural and physical parameters were drastically altered due to high energy photon exposure. The breaking down of larger particles was observed as a result of photon energy impact on the samples. The Saturation magnetization of ferrite nanoparticles was observed to increase with increasing gamma radiation dose. Mössbaure spectra showed the dominance of Fe sup(+3) in the high spin state.
