Abstract
The mechanism of electrical conduction in the magnetic semiconductors NixFe3-xO4 with 0.6 < x ≤ 1 was investigated. The electrical properties of these compounds are extremely sensitive to the presence of α-Fe2O3 as a second phase. The exponential temperature dependence of the electrical resistivity ρ and the temperature-independent thermoelectric power θ are in good agreement with an electron-hopping model. The electrical conduction occurs by thermally activated electron hopping between octahedral Fe2+ and Fe3+ ions with an activation energy q. The values of ρ, q and θ depend on the Fe2+ concentration only, and are not sensitive to small deviations from stoichiometry due to the presence of cation or anion vacancies.
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