Electrical transport properties of germanium-substituted lithium ferrites

摘要

Electrical conductivity (sigma) and thermopower (S) studies of polycrystalline germanium-substituted lithium ferrites having different compositions were made in the temperature range 400-1000 K. The composition dependence of electrical conductivity and thermopower has been discussed. On the basis of the sign of the Seebeck coefficient, all the samples under investigation have been classified as n-type semiconductors. Using the temperature variation of charge carrier concentration and mobility, the conduction mechanism in these ferrites is suggested.