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Carbon sitting in the octahedral void in FCC-iron is an example of……………

Question

Carbon sitting in the octahedral void in FCC-iron is an example of……………

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Solution

The example given, "Carbon sitting in the octahedral void in FCC-iron," is an example of interstitial solid solution.

In metallurgy, a solid solution is a solid-state solution of one or more solutes in a solvent. Such a multi-component system is considered a solution rather than a compound when the crystal structure of the solvent remains unchanged by the addition of the solutes, and when the mixture remains in a single homogeneous phase.

This is typically seen in metal alloys, where different metal atoms share the same crystal lattice. In the case of carbon in iron, the carbon atoms are small enough to fit into the interstices (spaces between atoms) of the iron lattice. The iron lattice structure is face-centered cubic (FCC), and the carbon atoms sit in the octahedral voids of this lattice. This is why it's called an interstitial solid solution.

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