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Cementite (or iron carbide) is a compound of iron and carbon, more precisely an intermediate transition metal carbide with the formula Fe 3 C. By weight, it is 6.67% carbon and 93.3% iron. By weight, it is 6.67% carbon and 93.3% iron.
Cohenite is a naturally occurring iron carbide mineral with the chemical structure (Fe, Ni, Co) 3 C.This forms a hard, shiny, silver mineral which was named by E. Weinschenk in 1889 after the German mineralogist Emil Cohen, who first described and analysed material from the Magura meteorite found near Slanica, Žilina Region, Slovakia. [3]
Boron carbide, B 4 C, on the other hand, has an unusual structure which includes icosahedral boron units linked by carbon atoms. In this respect boron carbide is similar to the boron rich borides. Both silicon carbide (also known as carborundum) and boron carbide are very hard materials and refractory. Both materials are important industrially.
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iron: ferrite, ferritic steel; iron: austenite, austenitic steel; iron carbide: cementite, Fe3C. It shows a eutectic and a eutectoid; these phases crystallise as a stacking of fine strips of pure phases (iron and cementite) in case of the eutectoid, or a pure iron containing small balls of cementite for the eutectic.
Low-pressure phase diagram of pure iron. BCC is body centered cubic and FCC is face-centered cubic. Iron-carbon eutectic phase diagram, showing various forms of Fe x C y substances. Iron allotropes, showing the differences in structure. The alpha iron (α-Fe) is a body-centered cubic (BCC) and the gamma iron (γ-Fe) is a face-centered cubic (FCC).
Though exceptions exist, such as the nonanuclear Ruthenium cluster (μ-C)Ru 9 (CO) 14 (μ 3-η 5: η 2:η 2-C 9 H 7) 2, containing a tripped trigonal prism geometry around the carbide. [6] The iron carbonyl carbides exist not only in the encapsulated carbon ([Fe 6 C(CO) 16] 2−) but also with exposed carbon centres as in Fe 5 C(CO) 15 and Fe 4 ...
In iron and steel metallurgy, ledeburite is a mixture of 4.3% carbon in iron and is a eutectic mixture of austenite and cementite. Ledeburite is not a type of steel as the carbon level is too high although it may occur as a separate constituent in some high carbon steels.