Volume : IV, Issue : X, October - 2014

Impact of fine particles on the magnetic properties of the Co1–x Cax Fe204

Himanshu. L. Padia

Abstract :

The low field a.c. susceptibility (χac) versus temperature, magnetization and Mossbauer effect measurements are reported for the spinel solid solution series Co1–x,Cax Fe2O4 (x <0.5) synthesized by a wetchemical method before and after high temperature annealing. The observed features for the wet–samples, such as the intense peak χac– T curve, the co–existence of paramagnetic doublet and magnetic sextets in Mossbauer spectra, and lower saturation magnetization values confirm fine panicle ferrite behavior. Especially, the appearance of the central paramagnetic doublet in Mossbauer spectra and a sharp intense peak in χac¬–– T curve in wet samples reveal the presence of super paramagnetic particles induced by fine particle size effects. Further the fine particle nature of wet–ferrite has increased the substitution limit of Ca for Co from 15% (ceramically prepared ferrite) to 30 %. The high temperature annealing changes the wet–prepared ferrites into the ordered magnetic structure of ceramic ferrites.

Keywords :

Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Himanshu. L. Padia Impact of fine particles on the magnetic properties of the Co1-x Cax Fe204 Indian Journal of Applied Research, Vol.4, Issue : 10 October 2014

Number of Downloads : 513

References :