Morphological and Electrical properties of transition metal ion substituted Calcium hexagonal nano ferrites synthesized by Sol gel auto-combustion method
Publication Date : 25/04/2016
In the present research module the samples with chemical composition CaMeFe 11 O 19 (where Me =La, Cr and Al) have been chosen for their studies on structural and electric properties. Above samples were successfully synthesized by sol gel auto combustion method in which the urea was used as a fuel. The XRD pattern revealed the formation of mono phase hexagonal ferrites with space group P63/mmc (No.194). The SEM and TEM results confirmed that the sample exhibit relatively well defined hexagonal like grains with average particle size in the range 52 nm to 38nm. The values of the lattice parameters supports this conformation. Electrical conductivity is measured by two probe method using Wyne Kerr 6500B model. The variation of DC conductivity in terms of (log σ) with reciprocal of temperature and was studied. It is explained on the basis of Verwey model. The variation of dielectric constant with log frequency and loss tangent with temperature for all samples were analyzed on the basis of Maxwell Wagner and Koop’s model.
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