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 1747.    ---------------.  [KHITAROV, P. I.]  [Double Carbides of Iron and Manganese.]  Vsesoyuz. Nauch.-Issledovatel. Inst. Metrol., Sbornik Trudov, 1941, No. 3 (No. 48), pp. 35-64; Chem. Abs., vol. 39, 1945, p. 5232.

       Double carbides of Fe and Mn having the typical formula of xFe₃C.yMn₃C were obtained as residues after acid (or other) attack on ferromanganese (20-80% Mn, 5-8% C) in an atmosphere of N₂ or CO₂.  By X-ray and phase studies these materials were shown to be solid solutions.  Mn₃C (used for reference in the X-ray work) was made by heating a 4:1 mixture of Mn₃O₄ and lampblack for 10-15 min. at 1,300°-1,400°.  By longer heating, homogeneous products were obtained with 7.3-7.6% C to which the empirical formulas Mn₁₁C₄ and Mn₈C₃ were assigned.  49 refs.