Effect of Co2 + content on the magnetic properties of CoxFe3 − xO4/SiO2 nanocomposites
- First Online:
- 118 Downloads
Non-stoichiometric CoxFe3 − xO4/SiO2 (x = 0.8, 0.9, 1.0, 1.1) nanocomposites have been prepared by sol-gel method. The structure, morphology and magnetic properties of the obtained samples were characterized by X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer and Mössbauer spectroscopy at room temperature. As the Co2 + content increases, the average particle size of the spherical CoxFe3 − xO4 in the samples decreases and the lattice constants increases. The hyperfine fields for both A- and B-site decrease, while the fraction of Co2 + occupying the A-site increases. Magnetization measurements show the saturation magnetization and coercivity of CoxFe3 − xO4/SiO2 decrease with increasing Co2 + content. The decrease in magnetization results from the weakened A-B interactions between Fe3 + , and the change in coercivity can be related to the variation of Co2 + at B-site and the decreasing particle size.
KeywordsSol-gel method Nanocomposites Mössbauer spectroscopy Magnetic properties
Unable to display preview. Download preview PDF.
- 16.Lee, J.G., Park, J.Y., Kim, C.S.: Growth of ultra-fine cobalt ferrite particles by a sol–gel method and their magnetic properties. J. Magn. Magn. Mater. 33, 3965–3968 (1998)Google Scholar
- 17.Bhide, V.G.: Mössbauer Effect and its Applications. Tata McGraw-Hill (1973)Google Scholar