Manganese Carbide

Because of the relative instabiUty of FeO, the reduction to metallic Fe occurs at a much lower temperature and appreciable CO2 is present in the product gas. The high temperature required for the reaction of MnO and C results in the formation of essentially pure CO the partial pressures of CO2 and Mn are <0.1 kPa (1 X 10 atm). The product of this reaction is manganese carbide (7 3) [12076-37-8J, Mn C, containing 8.56% carbon. Assuming immiscibility of the metal and carbide, Mn should be obtainable by the reaction of MnO and Mn C at 1607°C. However, at this temperature and activity of Mn, the partial pressure of Mn vapor is approximately 10 kPa (0.1 atm) which would lead to large manganese losses. 

In the nickel—carbon and cobalt—carbon systems, the nickel carbide (3 1) [12012-02-1], Ni C, and cobalt carbide (3 1) [12011-59-5] C03C, are isomorphous with Fe C and exist only at low temperatures. The manganese—carbon system contains manganese carbide (3 1) [12121 -90-3] Mn C, isomorphous with Fe C, and manganese carbide (23 6) [12266-65-8] isomorphous with chromium carbide (23 6) [12105-81 -6] These... 

Manganese Carbide, Mn,C solid, d 6.89 at 17q, was first prepd by Troost Hautefeuille. Moissan prepd it by heating in an elec furnace a mixt of Mn304 with sugar-carbon. Other methods of prepn are given in Refs 1 3 Refs l)Beil 1,(8), [111 128 2)H. 

Steel, as is well known, differs from iron by the presence of a certain amount of carbon, which induces the iron, when cold, to persist in its allotropic state. This appears to be due to a carbide of iron mixed with the excess of iron in the steel. The compound has been found as a meteoric mass it has been named cohenite, and has the formula FegC. On treating steel with dilute acetic acid, the same substance remains as a black powder. Its formula is similar to that of manganese carbide, MngC. 

CMna (s) Mn3C (s) Manganese Carbide alpha CMns (s) MnsC (s)... 

Mn3C manganese carbide 12266-65-8 25.00 6.8900 1 2734 N2H9P04 diammonium hydrogen phosphate 7783-28-0 20.00 1.6131 1... 

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