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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Structural and magnetic properties of Mn
x
Co
1-x
Fe
2
O
4
ferrite nanoparticles
Journal of Magnetism and Magnetic Materials, Volume 323, No. 5, Year 2011
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Description
We report on the structural and magnetic properties of nanoparticles of MnxCo1-xFe2O4 (x=0.1, 0.5) ferrites produced by the glycothermal reaction. From the analysis of XRD spectra and TEM micrographs, particle sizes of the samples have been found to be about 8 nm (for x=0.1) and 13 nm (for x=0.5). The samples were characterized by DC magnetization in the temperature range 5380 K and in magnetic fields of up to 40 kOe using a SQUID magnetometer. Mssbauer spectroscopy results show that the sample with higher Mn content has enhanced hyperfine fields after thermal annealing at 700 °C. There is a corresponding small reduction in hyperfine fields for the sample with lower Mn content. The variations of saturation magnetization, remnant magnetization and coercive fields as functions of temperature are also presented. Our results show evidence of superparamagnetic behaviour associated with the nanosized particles. Particle sizes appear to be critical in explaining the observed properties. © 2010 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Msomi, Justice Zakhele
South Africa, Bloemfontein
University of the Free State
Abdallah, Hafiz M.I.
South Africa, Durban
University of Kwazulu-natal
Moyo, Thomas
South Africa, Durban
University of Kwazulu-natal
Lančok, Adriana
Czech Republic, Rez
Institute of Inorganic Chemistry of the Czech Academy of Sciences
Statistics
Citations: 23
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.jmmm.2010.09.049
ISSN:
03048853
Study Approach
Qualitative