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M3C

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Originally appearing in Volume V05, Page 304 of the 1911 Encyclopedia Britannica.
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M3C = See also:

manganese, See also:iron ; M2C = See also:molybdenum ; M3C2= See also:chromium ; MC = See also:zirconium ; M4C3 = See also:beryllium, See also:aluminium ; M2C3 = See also:uranium; MC2 = See also:barium, See also:calcium, See also:strontium, See also:lithium, See also:thorium, &c.; M C4 = chromium. The See also:principal methods for the preparation of carbides may be classified as follows:—(1) See also:direct See also:union at a high temperature, e.g. lithium, iron, chromium, See also:tungsten, &c.; (2) by the reduction of oxides with See also:carbon at high temperatures, e.g. calcium, barium, strontium, manganese, chromium, &c.; (3) by the reduction of See also:carbonates with See also:magnesium in the presence of carbon, e.g. calcium, lithium; (4) by the See also:action of metals on See also:acetylene or metallic derivatives of acetylene, e.g., See also:sodium, See also:potassium. The metallic carbides are crystalline solids, the greater number being decomposed by See also:water into a metallic See also:hydrate and a hydro-carbon; sometimes See also:hydrogen is also evolved. Calcium See also:carbide owes its See also:industrial importance to its decomposition into acetylene; lithium carbide behaves similarly. Methane is yielded by aluminium and beryllium carbides, and, mixed with hydrogen, by manganese carbide. The important carbides are mentioned in the See also:separate articles on the various metals. The commercial aspect of calcium carbide is treated in the See also:article ACETYLENE.

End of Article: M3C

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