| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1812316 | Physica B: Condensed Matter | 2010 | 5 Pages |
Mössbauer spectroscopy has been employed to investigate the cation distribution and degree of inversion in bulk and nanosized particles of CuFe2O4, MnFe2O4 and NiFe2O4 ferrites. The Mössbauer spectra of all bulk ferrites show the complete magnetic behaviour, whereas nanoparticle ferrites are combination of ferromagnetic and superparamagnetic components. Moreover, the cation distribution in nanoparticle materials is also found to be different to that of their bulk counterparts indicating the particle size dependency. The inversion of Cu and Ni ions in bulk sample is greater than that of nanoparticles, whereas the inversion of Mn ions is less in bulk material as compared to the nanoparticles. Hence the degree of inversion (λ) decreases in CuFe2O4 and NiFe2O4 samples, whereas it increases in MnFe2O4 as the particle size decreases and thus shows the anomalous behaviour in this case. The nanoparticle samples also show paramagnetic behaviour due to superparamagnetism and this effect is more prominent in MnFe2O4.
