SYNTHESIS AND ELECTRICAL PROPERTIES OF COBALT SUBSTITUTED Y-TYPE CALCIUM HEXAFERRITES

Abstract

The series of samples of cobalt substituted calcium hexaferrite with composition Ca2Zn2Fe12-xCoxO22 where x varies from 0 to 1 were synthesized by microwave induced sol-gel auto-combustion route.X-ray diffraction patterns of all prepared samples manifests that the synthesized samples has single phase Y-type hexagonal crystal structure.The influence of substitution of Co 3+ ion for Fe 3+ ion on the lattice constants, cell volume, X-ray density, bulk density and porosity of samples has been studied.The DC electrical conductivity of the samples were measured as a function of temperature from 300 K to 873 K using two probe techniques.The phenomenon of conduction was explained on the basis of a Vervey hopping model.