Phase Equilibria in the Ferrite Region of the System Manganese-Iron-Oxygen

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Abstract
An important factor in growing crystals from the melt is an understanding of the phase relationships for systems involving the necessary elements. This investigation deals with the determination and interpretation of these relationships in the ferrite region of the system Mn-Fe-O and points out the conditions necessary to grow crystals along the Mn3O4-Fe3O4 join. The results are presented in terms of a phase diagram which shows isotherms, isobars, and fractionation curves, the data necessary to predict the exact crystallization path of compositions which fall in the ferrite region. Several crystallization paths are discussed and their relationship to crystal growth pointed out. Liquids falling on the Mn-Fe side of the Mn3O4-Fe3O4 join are deficient in oxygen and on cooling will precipitate a lower oxide phase in addition to a stoichiometric ferrite. On the other hand, ferrite crystals separating from liquids whose compositions fall on the oxygen side of the join can have excess oxygen (cation vacancies).

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