Thermoelectric Power Studies Cu-Cd Ferrites

Abstract

Thermoelectric Power Studies of Cadmium Substituted Copper Ferrites of various compositions were investigated from room temperature to well beyond the curie temperature by differential method. The Seebeck coefficient is negative for all compositions showing that these ferrites behave as n-type semi conductors. Plots of Seebeck coefficient verses tem- perature shows maximum at Curie temperature. On the basis of these results an explanation for the conduction mechanism in Cu-Cd mixed ferrites is suggested

Transport properties of Ti–Ni spinel ferrites

“…Moreover, Seebeck coefficient increases with increasing temperature up to a certain temperature T S , beyond which, the value of S becomes constant or starts to decrease. Many researchers [4,5,7,19], attributed this transition temperature to a magnetic transition from ferrimagnetic to paramagnetic state, which contradicts with our results. Kale et al [9] studied the cation distribution for Ni 1 þ x Ti x Fe 2 À 2x O 4 and reported that Ni 2 þ occupies octahedral B-sites, whereas both Fe 3 þ and Ti 4 þ ions are distributed over tetrahedral (A) and octahedral (B) sites.…”