Mössbauer and magnetic studies on nanocrystalline NiFe2O4 particles prepared by ethylene glycol route

Abstract

NiFe 2 O 4 nanoparticles have been synthesized by co-precipitation method at 145 • C in N 2 atmosphere using ethylene glycol as solvent and capping agent. This gives the promising synthesis route for nanoparticles at low temperature. The as-synthesized NiFe 2 O 4 is subsequently heated at 400 • C, 500 • C, 700 • C and 800 • C. Crystallite size increases with the heat treatment temperature. The heat treatment temperature has direct effect on the electron paramagnetic resonance and intrinsic magnetic properties. The room temperature Mössbauer spectrum of the 800 • C heated sample shows the two sextets pattern indicating that the sample is ferrimagnetic and Fe 3+ ions occupy both tetrahedral and octahedral sites of spinel structure.

Synthesis and characterization of manganese ferrite nanoparticles by thermal treatment method

“…The smallest particle size obtained in this study was 12 nm at 723 K and it reached 22 nm at the highest calcination temperature of 873 K. This suggests that several neighboring particles fuse to increase the particle sizes by the melting of their surfaces [16]. A grain growth of particle size enlargement at higher calcination temperatures was observed previously in nickel ferrite [17] and in cobalt ferrite [18] systems. Fig.…”

“…The addition of Fe 3 + ions at higher temperature in A site causes an increase in the super-exchange interactions, contributing to an increase in the internal field and a decrease in the resonance magnetic field [13]. Increases in DH pp and g-factor and decreases in H r with increase in calcination magnetization values have been reported in NiFe 2 O 4 nanoparticles [17].…”

Combustion synthesis and characterization of highly crystalline single phase nickel ferrite nanoparticles

“…Perusal of the table gives an idea that the samples synthesized through other methods and also through same combustion method but with different fuels, lack either in phase purity or in the saturation magnetization. However, the properties of our sample appear to be comparable with those reported by Umare et al [43] which were arrived through co precipitation method with ethylene glycol as solvent and capping agent.…”

Synthesis and characterization of polyaniline/NiO nanocomposite

“…NiO nanoparticles were prepared by EG route 42, 43. Fifty milliliters of nickel chloride (0.2 M ) solution were taken in three‐necked RB flask fitted with air condenser.…”