ELECTRICAL-TRANSPORT PROPERTIES OF GERMANIUM-SUBSTITUTED LITHIUM FERRITES

Electrical conductivity (sigma) and thermopower (S) studies of polycry stalline germanium-substituted lithium ferrites having different compo sitions were made in the temperature range 400-1000 K. The composition dependence of electrical conductivity and thermopower has been discus sed. On the basis of the sign of the Seebeck coefficient, all the samp les under investigation have been classified as n-type semiconductors. Using the temperature variation of charge carrier concentration and m obility, the conduction mechanism in these ferrites is suggested.