Conduction mechanism in magnetite

The conductivity σ, the coefficient of the thermal emf α, and the Mössbauer effect (NGR) are studied in stoichiometric and oxidized magnetite specimens in the temperature range 80≤ T ≤700°K. Analysis of the experimental results permitted the detection of an interrelationship between the kinetic coefficients and certain parameters of the NGR spectra. A qualitatively new conduction model is proposed in Fe3O4 above and below the Verwey transition (Tv). In this model the order of magnitude and the function σ(T) as well as the function α(T) are related to the conduction in the 4s band for T > TV. At these temperatures the Fe3O4 is considered an intrinsic semiconductor which is partially degenerate at or near room temperature. It is assumed that hopping conduction exerts a perceptible influence on the dependence observed at temperatures substantially below Tv.

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