Structural and magnetic studies of coprecipitated Me-spinel (Me = Co, Ni, Cu arid Mg) ferrite nanoparticles

The report attempts to study some spinel such as cobalt (Co-F), nickel (Ni-F), copper (Cu-F) and magnesium (Mg-F) nanoferrites, which are synthesized by coprecipitation route and annealed at 850 degrees C for 2 h. Powder X-ray diffraction patterns depict the formation of single cubic spinel structure (Fd-3m). Thereby, lattice parameter is ranging between 8.3420 and 8.4009 angstrom, while average crystallite size is found in 20-38 nm. Transmission electron and scanning electron microscopies exhibit that the nanoparticles are agglomerated and revealing mixture of spherical and irregular shapes. The fit of Co-F, Ni-F and Cu-F room Fe-57 Mossbauer spectra was established with two sextets, which reflects that the Fe3+ is occupied two sub-lattices of spinel system. A weak percentage of quadruple doublet, 2%, was observed in both Ni-F and Cu-F spectra. Exceptionally, the Mg-F room Fe-57 Mossbauer spectrum indicates broadening lines due to disordering of iron magnetic moments because of small nanoparticle size (20 nm), it was fitted with hyperfine field distribution, Mg-F spectrum was also collected at 6 K reflecting a ferrimagnetic ordering according to Neel's theory. M(T) curves indicate that the blocking temperature is higher than 300 K, except the Mg-F sample shows a T-B of similar to 226 K. Besides, the M(H) loops at 5 K exhibit a soft behavior and the magnetic parameters like M-s, M-r, mu(e)/ M-r/M-s ration, H-c and K-a have determined for the studied spinel ferrites.

Automated summary

This report investigates the synthesis and characterization of cobalt, nickel, copper, and magnesium nanoferrites. The results show that the synthesized nanoparticles have a spinel structure and agglomerated morphology. Mossbauer spectroscopy reveals the occupation of Fe3+ on two sub-lattices of the spinel system. The research also examines the magnetic properties of the spinel ferrites.