Thermal studies of the electrical conductivity of LiCoYb-ferrites Original Research Article

In the present work, the effect of temperature on the electrical properties of Li0.5+zCozYbxFe2.5−2z−xO4 where z=0.1 and 0.0≤x≤0.2 has been discussed. Both Rac and Rdc increase with temperature up to the Curie-point after which Rac decreases to 10% of its maximum value and levels off at ≈500 K while Rdc decreases to 19% of its maximum value and levels off at ≈400 K. A noticeable sharp increase appears on both resistances at x=0.1. The relation between relative density and relative volume which decreases as a result of sintering temperature was discussed for different Yb content. The dependence of thermal stimulation depolarization current (TSDC) on the polarized time and field for Li0.6Co0.1Yb0.075Fe2.225O4, has been discussed. The present results point to the possibility of using the investigated samples for electronic applications.