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Preeti Mathur, Atul Thakur, M. Singh

Processing of High Density Manganese Zinc Nanoferrites by Co-Precipitation Method

Keywords: Nanoparticles, Direct Current Resistivity, activation energy, Porosity, X-ray diffraction

Nanoparticles of spinel ferrites Mn_xZn_1-xFe₂O₄ with x = 0.0 to 1.0 were prepared by co-precipitation method. The ferrite samples were pre-sintered at 200ºC at the rate of 200ºC/h for 15h. Finally, one set of samples was sintered at 400ºC and the other set at 500ºC at the rate of 200ºC/h for another 15h. The spinel structure was confirmed by X-ray diffraction (XRD) pattern. The particle size was calculated by using Debye–Scherrer´s equation for Lorentzian peak. The calculated average particle size lies between 19–53nm. The particle size was also investigated by using scanning electron microscopy (SEM). Both the results were found to be in good agreement. The resistivity data was taken by two probe method and resistivity, activation energy and porosity were calculated. There was an increase in the resistivity and activation energy when the ferrite samples were sintered at a higher temperature. Possible models, theories and mechanisms contributing to these processes have been discussed.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 221, 07/2007
Pages: 887 - 895

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