Curie Point Transitions in Phosphides and Arsenides of Manganese

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Abstract
The relative permeability of several alloys of manganese with phosphorus and arsenic have been measured in the region of the Curie point. The alloys were heated and cooled very slowly to eliminate, as much as possible, irreversible effects. The composition range investigated included alloys of higher phosphorus and arsenic content than have previously been investigated. Ferromagnetism in the phosphorus alloys appears to be due to the compound MnP over the range 27—58 mole percent P, and the magnetic and density transitions exhibit no temperature hysteresis. The temperature hysteresis in the magnetic transformation of manganese arsenide is confirmed. The Curie point‐composition relation for the arsenides is discussed and evidence presented for the existence of a manganese‐rich compound, perhaps Mn8As7, rather than a solid solution of Mn in MnAs.

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