Abstract
The electrical conductivity of two kinds of molybdenum ferrites has been studied during their oxidation in cation-deficient spinel under O 2 atmosphere, using a linear heating rate. The conductivity evolution during the oxidation reaction was related to the change in the cationic distribution; for instance, the two registered decreases in the conductivity correspond to the disappearance of the Fe 2+ Fe 3+ and the Mo 3+ Mo 4+ ion pairs on octahedral sites. Such an observation could be explained by the existence of two hopping mechanisms on the octahedral sites between the Fe 2+ and Fe 3+ ions on the one hand and the Mo 3+ and Mo 4+ ions on the other hand.
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