Abstract
Nanostructured Co1-xZnxNdyFe2-yO4 (0 ≤ x ≤ 1.0; y = 0.0 and 0.1) ferrites were synthesized through combustion route. All the compositions were irradiated with 60Co gamma with total exposure dose 310 kGy at the dose rate 6.1kGy/h. The virgin and irradiated nanoparticles were characterized by the techniques; XRD, FTIR, SEM and EDAX. The DC electrical conductivity was measured in temperature range 300–800K. Magnetic parameters were measured with vibrating sample magnetometer (VSM) at 300K. Characterization studies reveal the structure, size, morphology and composition of the nanoferrites. The x-ray diffraction analysis revealed the cubic spinel ferrite structure. The characteristic feature of nanoferrites was confirmed by two prominent absorption bands ν1 and ν2 in the range 566–607 cm−1 and 401-498cm−1. The SEM micrographs evidenced almost spherical shaped agglomerated grainy structure of nanoferries. DC conductivity studies revealed that Curie temperature (TC) decreased with increasing Zn2+ ion and Nd3+ ion substitution due to the weakening of A–B interaction. The observed enhancement of DC conductivity and magnetic parameters on γ-irradiation attributed to the rearrangement of cations at A-site and B-site in the lattice.
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