Influence of high dose gamma irradiation on structural and magnetic properties of Mg-Cd nanoferrites

摘要

Nanocrystalline Mg_(1-x)Cd_xFe_2O_4 ferrites were synthesized by solution combustion method and were irradiated with ~(60)Co γ -rays source with total exposure dose of 310 kGy at the dose rate 6.1kGy/h. XRD pattern revealed the formation of single phase cubic spinel structure. The FTIR spectra showed two strong absorption bands in the range of 350-800 cm~(-1). On γ-rays of the samples, it is observed that lattice parameters have been enhanced due to the ionizing effect of gamma irradiation and also it is found that a significant increase in the in magnetic parameters attributed to the redistribution of cations on A-sites and B-sites. The coercive field (Hc) of the irradiated nanoparticles found to higher than that of the unirradiated samples. This is due to the controlled growth of single domain particles. Further, it is found that Y-K angle for irradiated samples is higher compared to those of corresponding unirradiated sample attributed to the increase in magnetization and consequently higher observed magnetic moment of irradiated samples.