Effect of Li sub(2)O doping on electrical properties of CoFe sub(2)O sub(4)

• Published in: Solid state ionics 1999-01, Vol.120 (1), p.173-181
• Main Authors: Selim, M Soliman, Turky, G, Shouman, M A, El-Shobaky, G A
• Format: Article
• Language: English
• ISSN: 0167-2738

The solid-solid interactions between cobalt and ferric oxides to produce CoFe sub(2)O sub(4) were followed up using XRD investigation. The effect of Li sub(2)O-doping on the ferrite formation was also studied. The electrical and dielectric parameters of pure and doped mixed solids precalcined at 1273 K were measured using d.c and a.c instruments. The dopant concentration was varied between 0.5 and 6 mol% Li sub(2)O. The results obtained revealed that Li sub(2)O doping much enhanced the ferrite formation due to an increase in the mobility of the reacting species. The addition of the smallest amount of Li sub(2)O (0.5 mol%) resulted in measurable variations in specified electrical constants. Resistivity increased upon increasing the dopant concentration up to 1.5 mol% exceeding the values measured for the undoped sample. Furthermore, the presence of 6 mol% Li sub(2)O brought about a significant decrease of electrical resistivity. Also, the activation energy decreased with increasing the dopant concentration. The Li sub(2)O-doping modified the values of different dielectric constants, the change in these constants was found to be strongly dependent on the amount of Li sub(2)O added. These results have been discussed in terms of the potentiality of Li sub(2)O in increasing the mobility of the reacting species involved in the ferrite formation.