Article ID Journal Published Year Pages File Type
1805360 Journal of Magnetism and Magnetic Materials 2006 8 Pages PDF
Abstract

Aluminum substituted cobalt ferrites having particle size ∼10 nm were prepared using aerosol route, which increases with annealing temperature. The unit cell parameter ‘a’ and saturation magnetization decreases linearly with the increase of aluminum concentration. This is due to the smaller ionic radius and the diamagnetic nature of the Al3+, respectively. Room temperature Mössbauer spectra of the samples annealed at 1200 °C show broad sextets, which were fitted with different sextets, indicating different local environment of both tetrahedrally and octahedrally coordinated iron cation. Further, hyperfine field of the samples decreases with the increase of Al3+ concentration due to the fact that the Al3+ diamagnetic species reduce the magnetic interactions. Cations distribution indicated a increase in Fe3+(oct.)/Fe3+(tet.) ratio on increasing the Al3+ concentration.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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