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Ferromagnetism of Certain Manganese-Rich Alloys

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Abstract

A series of manganese-rich ferromagnetic alloys has been studied. The alloys are based upon an interstitial solution of carbon in manganese. In each of the systems investigated, the ferromagnetic phase was found to be face-centered-cubic in structure. This magnetic phase is based upon the composition (Mn, X)4C; where X is a metallic element which has both a positive size factor with respect to manganese and a high positive valence. Typical elements of this type are aluminum, indium, and tin. Preliminary magnetic measurements indicate that the effective magnetic moment of manganese in the alloys is at least 1.0 Bohr magneton per atom. It is emphasized that the critical atomic separation beyond which ferromagnetism can occur will be governed by the electronic configuration of the manganese atoms. Lattice parameter measurements show that the ferromagnetic condition in the present alloys is associated with an increased atomic separation of only 3 to 6 pct compared with a hypothetical face-centered-cubic lattice of pure manganese.

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Authors and Affiliations

  1. Metallurgical Dept., Scientific Laboratory, Ford Motor Co., Dearborn, USA

    E. R. Morgan (Junior Member AIME, Supervisor, Physical Metallurgy)

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  1. E. R. Morgan
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Additional information

Discussion on this paper, TP 3791E, may be sent, 2 copies, to AIME by Jan. 1, 1955. Manuscript, Nov. 2, 1953. Chicago Meeting, November 1954.

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Morgan, E.R. Ferromagnetism of Certain Manganese-Rich Alloys. JOM 6, 983–988 (1954). https://doi.org/10.1007/BF03398334

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