Crystal Structure of Molybdenum Carbide
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- Category: Molybdenum knowledge
- Published on 24 September 2013
- Written by 陈桂兰
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Molybdenum carbide (Mo2C) can occur in many crystalline forms, the most common of which is α-MoC and β-MoC. It is the latter phase which is stable at low temperatures and occurs in steels. β-MoC has a close-packed hexagonal crystal structure with the carbon atoms located in one half of the available octahedral interstices. The lattice parameters assumed for the diagrams below are a=0.3007 nm and c=0.4729 nm.
In the MoC system at least six different phases have been identified, see Table 5.1, this even once called in the literature for "The MoC problem''. The two (possibly three) different MoC phases exhibit an ABAB stacking sequence of the metal planes with carbon in the octahedral sites. The difference between the MoC phases is due to order/disorder transformations of the carbon atoms. The cubic -MoC phase is isostructural with TiC, i.e, a NaCl-type structure, with the well-known ABCABC stacking sequence, while the phase denoted MoC is isostructural with WC and exhibits a simple hexagonal structure with an AAAA packing of the metal atoms. In addition, two more complex phases with hexagonal structures have been identified: the MoC phase with an ABCACB packing sequence and the -MoC phase with an AABB stacking of the metal planes.
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