Authors : S. R. Gawali, P. R. Moharkar, R. R. Kherani and K. G. Rewatkar
Page Nos : 227-231
Description :
Abstract:
The series of samples of aluminium substituted calcium hexaferrite with composition CaAlxFe12-xO19 (x=1 and 3) were synthesized by microwave induced sol-gel combustion method. X-ray powder diffraction (XRD) patterns of all prepared samples indicated the formation a single M-type phase hexagonal ferrite. The lattice constants, cell volume, X-ray density, bulk density and porosity of samples were measured from XRD data. TEM analysis revealed that the average particle size of the samples are in nano-range. The dc electrical resistivity, activation energy and drift mobility of susbtituted calcium ferrites were investigated as a function of temperature and Al3+ ion concentration. The enhanced resistivity of the aluminium substituted calcium hexaferrite has a potential application in microwave devices. The drift mobility of samples was calculated from the electrical resistivity data. The effect of aluminium ion substitution on electric properties of nano-ferrites was explained on the basis of cation distribution in the crystal structure.
Keywords: M-type hexagonal ferrite, structural property, electrical property, drift mobility, Sol-gel combustion method etc.
