THE EFFECTS OF IONIZING-RADIATION ON THE THERMOPHYSICAL PROPERTIES OFSUBSTITUTED SR-FERRITES

Different samples of Sr-ferrites have been synthesized by the usual ce ramic and high temperature sintering technique. On these samples, seve ral measurements have been undertaken namely, thermogravimetric analys is (TGA), differential scanning calorimetry (DSC), the temperature dep endence of DC electric conductivity before and after gamma-absorbed do se, and the temperature dependence of dielectric constant. Results obt ained were explained, correlated, interpreted and discussed in detail on the basis of the interaction of temperature, dopant cations and gam ma-radiation with the Sr-ferrite lattice. The activation energy (Delta E), energy gap for semiconduction and activation energy for gamma-rad iation-induced carrier liberation (chi) were evaluated for the first t ime. Finally, a mechanism for semi-conductivity in terms of energy ban d picture in intrinsic ferrite semiconductors is suggested and discuss ed.