Explain why the diffusion of an interstitial atom (such as c, n, o, etc.) is faster when diffusing through iron with a bcc crystal structure rather than an fcc crystal structure.

Answer and Explanation:

Interstitial diffusion allows the purity atom like (C, O, H) to occupy the interstitial sites in the atom which are abundantly present as a result of weaker bond formation with the surrounding atom.

The interstitial diffusion of iron in Body Centered Cubic (BCC) crystal lattice is faster than Face Centered Cubic (FCC) and the reason being that BCC structure is more open with more interstitial spaces than FCC structure.

Also the packing fraction of BCC lattice is less than that of FCC lattice.

For BCC is 0.68 whereas for FCC, it is 0.74

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

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