Thesis in Physics

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Radiation induced structural and electric properties of Al-Substituted NiCuCd nanoparticles
(CUET, 31-Jan-2024) Sharma, Bishakar
The effect of gamma (γ) irradiations on the physical, magnetic and electrical properties of nanoferrites samples with a chemical formula of Ni0.5Cu0.2Cd0.3Fe2-xAlxO4 have studied. These samples have prepared by sol-gel auto combustion method. The synthesized samples have irradiated for γ rays from 60Co source at room temperature with a dose of 1 and 3 MRad, at a dose rate of 1.067 MRad/h. X-ray diffraction (XRD) parameters, magnetization, dielectric constant, dielectric loss factor, electric modulus, impedance and ac conductivity have analyzed for the irradiated samples. XRD patterns show that the irradiation has caused a change in the lattice constant due to ions redistribution. The lattice constant of the investigated samples has increased with the increase in irradiation (gamma) due to the conversion of Fe3+ (0.67Å) to Fe2+ (0.76Å). Moreover, the cation redistribution play an important role in increasing the values of ac conductivity with increasing the irradiation (gamma) dose.