Study of the electrical properties of calcium-substituted Li-Zn ferrite

Abstract

Temperature and composition dependence of the dc resistivity (ρ dc ) and thermoelectric power (α) of Li 0.3-0.5x Zn 0.4 Ca x Fe 2.3-0.5x O 4 ferrites (x = 0.0, 0.01, 0.02, 0.03 and 0.05), prepared by the standard ceramic method, have been studied. The behavior of both ρ dc and α with temperature support the electron hopping conduction mechanism in the ferrimagnetic phase while the band mechanism dominates in the paramagnetic phase. Moreover, it was found that both ρ dc and a decrease with increasing x up to x = 0.02 and then increase. The frequency and composition dependence of ε′, ε″ and ρ ac are found to support Koops's model. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.