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Carbon and Hydrogen both diffuse in iron through an interstitial mechanism. The activation energy for C...

Carbon and Hydrogen both diffuse in iron through an interstitial mechanism. The activation energy for C diffusion in BCC iron is 20,900 cal/mol and the activation energy of H is 3,600 cal/mol. Why is the activation energy for H so much less?

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A diffusing atom must pass through surrounding atoms to reach its new site.As the size oh H is smaller as compare to the size of C there it is quite easy of H atom to migrate to new position .As the energy must be supplied to get move to a new position . the atom initially in low - energy , stable state in order to move it we must applied some energy so that atom must overcome the energy barrier . this energy requirement is different for different atom as the size of H is small it can easily migrates and hence required lesser energy as compare to C atom .

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