Abstract
A survey of the literature shows that various defect models involving iron vacancies with different degrees of ionization, electron holes, interstitial iron ions, intrinsic disorder, clustering, etc., are suggested forwüstite, a phase described by the formula Fe1−-YO,where y stands for the stoichiometric deviation, and for which the existence of three modifications WI, W2, W3 has been proposed. Statistical considerations and thermogravimetric studies make the predominance of doubly ionizedvacancies at any defect concentration rather unlikely. At y≥0.077 vacancies will be neutralized. The oxygen-pressure-dependence of the electrical conductivity does not permit conclusions to be drawn on the kind of defect structure because the exact conduction mechanism responsible for the p to n transition at the approximate composition given by the formula Fen11012 is not known. As well as the presenceof singlyionized vacancies V‘’ and neutral vacancies V x, several Roth-type complexes must be considered,at least in the phase regions labelled W2 and W3, for which an interpretation is attempted in this paper.
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