Nanoparticles of Ni1-xZnxCe0.1Fe1.9O4 ferrite substituted with Zn2+ ion concentrations (0.0, 0.2, 0.4, 0.6, 0.8 & 1.0) have been synthesised via aqueous citrate precursor auto combustion method. The obtained Powder X-ray diffraction data suggests a good crystalline phase; the crystallite size exists in the range of 14~38 nm. The lattice constant of samples increases with Zn2+ concentration. It validates Vegard's law and the decreasing trends in porosity of the samples are identified. The inhomogeneity in the grains was confirmed from FE-SEM. The EDS spectrogram attributes the good stoichiometry in the product. The Thermogravimetric analysis reveals that the crystallization occurred within the temperature 800˚C. The high-temperature DC conductivity of the samples shows that NTC behaviour. The Curie temperature and activation energy are estimated and the activation energy of carriers are found to be more at the paramagnetic region. The magnetic saturation ('Ms*') has maximum for Zn2+ = 0.2 (57.7 emu/g) and coercive field (Hc) related with a radius of occupancy of Zn2+ ion validates the relation Hc∝1/r and also, the value of the remanence ratio suggests that isotropic magnetization took place in the heterogeneous material.
Herein we report the effect of γ-irradiation on AC electrical properties of Ni-Zn nanoparticles Ni1-xZnxFe2O40≤x≤1synthesized via the citrate auto-combustion technique. The X-ray diffraction (XRD), analysis of the samples revealed a decreasing trend of the crystallite size with increasing concentration of Zn2+ ion. The lattice constant was found to increases with Zn2+concentration with the highest for x=0.6. The AC-electrical behaviour of the sample were studied before and after γ-irradiation in the frequency range 1MHz-23MHz. Studies show that the dielectric constant increased up on irradiation whereas the dielectric loss and AC conductivity decline after irradiation. The dielectric relaxation changes from non-Debye to Havriliak–Negami relaxation, which is the significance of asymmetric broadness in the relaxation process. The collective AC electrical propertis signifies the radiation absorption respons.
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