THE ELECTRICAL-CONDUCTION OF TITANOMAGNETITES

Electrical conductivity and thermoelectric power measurements on singl e crystalline titanomagnetites are reported for the temperature range of 80 up to 1100 K. The results can be well explained in terms of hopp ing conduction in disordered systems; the conduction is governed by el ectron-electron and electron-titanium interactions, leading to a rando mization of the site-energies. Both interaction parameters are in the order of 0.1 eV. From the experimental results a tentative energy leve l scheme has been deduced for the complete mixed series Fe-3-xTixO4.