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3. Calculate the fraction of vacant sites in aluminum at 400C if the activation energy is 0.76ev. What is it at 660C? 4. How

3. Calculate the fraction of vacant sites in aluminum at 400C if the activation energy is 0.76ev. What is it at 660C? 4. How oversized is a carbon atom in an Fe FCC lattice in an octahedral interstitial site? The radius rFe = .124nm and rc = .077nm.

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