Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite |
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Authors: | Surendra S More Ram H Kadam Ankush B Kadam Dhanraj R Mane and Govind K Bichile |
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Institution: | (1) Novel Materials Research Laboratory, Department of Physics, University of Pune, Pune, 411 007, Maharashtra, India; |
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Abstract: | A series of CoAlxCrxFe2−2xO4 systems (x = 0.1 to 0.5 in steps of x = 0.1) spinel ferrites have been synthesized successfully using wet chemical co-precipitation
technique. The samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and magnetization measurements.
The powder XRD patterns confirm the single phase spinel structure for the materials synthesized. X -ray diffraction measurements
were performed to yield the lattice constant as function of the amount x corresponding to Al-Cr substitution. Lattice parameters,
X-ray density, bulk density and particle size decrease whereas porosity increases with the increase in Al-Cr content, ‘x’.
Infrared studies show two absorption bands at about 400 cm−1 and 600 cm−1 for octahedral and tetrahedral sites, respectively. Saturation magnetization decreases with the increase in Al-Cr content
x. AC magnetic susceptibility measurements were carried out as a function of temperature to measure the Curie temperature,
which was found to decrease with Al-Cr content x. The decrease of Curie temperature has been explained by A-B interaction.
![MediaObjects/11532_2009_145_Fig1_HTML.jpg](/content/02757170V2W01U0H/MediaObjects/11532_2009_145_Fig1_HTML.jpg) |
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