High temperature thermoelectric power studies of cobalt and titanium substituted barium hexagonal ferrites

Thermoelectric power studies of cobalt and titanium substituted barium hexagonal ferrites of various compositions were investigated from room temperature to well beyond the Curie temperature by the differential method. The Seebeck Coefficient is negative for all the compositions showing that these ferrites behave as n-type semiconductors. Plots of Seebeck coefficient vs. temperature show a maximum at Curie temperature. On the basis of these results an explanation for the conduction mechanism in Ba-Co-Ti mixed ferrites is suggested