Published on November 2008 | Nanoparticles

Magnetic and Mossbauer spectral studies of nano crystalline cobalt substituted magnesium ferrites (MgxCo1−xFe2O4)

Nano size MgxCo1−xFe2O4 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) ferrites have been prepared using sol gel method and characterized using i.r., TEM, XRD, magnetic and M ssbauer spectral studies. The particle size of as obtained samples was found to be ∼6 nm, which increases up to ∼80 nm after annealing at 1,000◦C. The saturation magnetization decreases from 80.0–27.5 emu/g on increasing the Mg2+ ions after annealing at 1,000◦C due to the diamagnetic behaviour of the Mg2+ ions. Room temperature (RT) M ssbauer spectra (MS) of as obtained samples exhibit a broad doublet, suggesting super paramagnetic nature of the sample. However, annealed samples exhibited a broad sextet, resolved into two sextets, corresponding to tetrahedrally and octahedrally coordinated Fe cations.