STRUCTURAL AND OPTICAL PROPERTIES OF Cr-SUBSTITUTED Mg-FERRITE SYNTHESIS BY CO-PRECIPITATION METHOD

A series of Cr substituted Mg-ferrites were synthesized by coprecipitation technique annealed at 900 o C for 6h. XRD analysis technique was used to confirm the formation of synthesized ferrites structure and the particle size estimated by Scherrer formula was found to be lying in the range 42.4 to 84.8 nm. All the prepared samples exhibited inverse cubic spinel structure and lattice parameter found in the range (8.3814-8.3756 Å). The morphology and the formation of nanoparticles were observed by scanning electron microscopy (SEM). For the elemental analysis, the energy dispersive X-ray (EDX) confirmed the existence of Mg, Cr, Fe and O orbital state. Moreover, the representative sample UV/Vis spectra of the Cr-substituted Mg-ferrites revealed that the absorbance shifted from 373 to 386 nm for reference samples at x=0.2 and x =0.5 and the wavelength lies most prominently in UV region wavelength 200-380 nm approximately. The electrical measurements were done by two probe method. It was observed that at room temperature the DC resistivity decreased with the increase in chromium content while synthesized material have semiconductor behavior with the rise of temperature.