Variations of melt flow rate and particle size with atomization conditions: H.C. Lee et al (Seoul National University, Seoul, Korea), J Korean Inst of Metals, Vol 30, No 8, 1992, 921–928. (In Korean)

Abstract

Rare earth (Nd3+) doped Manganese-Zinc Ferrite nanoparticles with composition Mn0.65Zn0.35Fe2-xNdxO4 (x = 0.04, 0.05 and 0.06) were prepared using combustion method of materials preparation. Formation of pure spinel phase was confirmed using X-ray diffraction (XRD) and Fourier transforms infra red spectroscopy (FTIR). The samples were exposed to various doses of γ-radiation (500Gy, 750Gy and 1000Gy) after recording the data on structural and electrical transport properties of as prepared samples, in order to study the effect of γ-radiation on these properties of the nanoparticles. Lattice constant 'a' that showed a moderate increment with Nd3+ doping was found to show a further increase after γ-radiation exposure with nearly a 30%–40% reduction in crystallite size. Transmission electron micrographs showed a decreasing trend of particle size that was nearly proportional to increasing dose of γ-radiation. The samples which showed enhancement in resistivity profile with increasing Nd3+ concentration showed a reverse trend of decrease in the resistivity values with increasing γ radiation dose thus contributing to the conduction process. The dielectric constant of Nd3+ doped samples showed a multifold increase in the dielectric constant with a further increase in its values for radiated samples, when referred to the values reported for undoped Mn-Zn nanoparticle ferrite materials.