Abstract

Thermoelectric power measurements were conducted on polycrystalline Ti- and Zr-substituted Mn–Zn ferrites, and the corresponding Seebeck coefficient, carrier concentration, and drift mobility were analyzed. The Seebeck coefficient increased steadily with temperature, attaining peak values near 450 K for Ti-substituted samples and 440 K for Zr-substituted samples. All compositions exhibited n-type conduction across the entire temperature range investigated. At elevated temperatures, the ferrites demonstrated non-degenerate semiconducting behavior, indicative of thermally activated charge transport. The conduction mechanism is predominantly governed by electron hopping between Fe²? and Fe³? ions, in agreement with the presence of narrow energy bands and localized electronic states. The temperature-dependent behavior of drift mobility can be explained using the wavy-band model, which accounts for variations in the density of states affecting carrier transport.

Authors

B. Ramesh, P. Mohan Babu, K. Devanandam, B. Venkateswarlu, S.K. Erfan, S. Kondala Rao
QIS College of Engineering and Technology, India

Keywords

Ferrites, Thermoelectric Power, Mobility, Carrier Concentration