Semiconductor to Metallic Type Transition in Ni1.5Fe1.5O4 Ferrite.

We have investigated electrical properties of Ni1.5Fe1.5O4 ferrite. The sample has been prepared by chemical coprecipitation route. The dc limit of conductivity has been derived from the fitting of ac conductivity data using Johnscher power law and Cole-Cole plot of impedance spectrum. The temperature dependence of dc conductivity data indicated a semiconductor to metallic type transition at 373K and metallic to semiconductor transition at 413K. Such electrical transition may be attributed to the effect of localization and de-localization of charge carriers in the hopping paths (Fe3+-O-Fe3+) and (Ni2+-O-Ni3+). [ABSTRACT FROM AUTHOR]