الملخص

Abstract : Electrical conductivity and seeback effect studies of soft ferrite Ni0.2Zn0.8Fe2O4 as a function of annealing temperatures range (800 – 1200)oC. The electrical conductivity and seeback effect measurements are studied from different temperatures between 23oC to 323oC. So the seeback effect measurements show that the most carrier charges for this material are positively charges (i.e at p-type material). Also the electrical conductivity measurements increased with increasing annealing temperature tilled to 1100 oC which means the predominantly due to the hopping of electrons and holes between Fe2+ and Fe3+ ions at the octahedral sites and Ni2+ and Ni3+ ions at the tetrahedral sites. Therefore the above results of these measurements strengthened through expense bulk density and activation energies, reached at maximum annealing temperature at 1100 oC degree.