Word Count : 249

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Diffusion in solids strongly depends on the size of diffusing species, type of diffusion mechanism, and the crystal structure of the host lattice. In the case of carbon and nickel diffusion in iron, the difference arises primarily from the mechanisms they follow. Carbon is a much smaller atom compared to iron, and when introduced into the iron lattice, it occupies interstitial sites ____ ___ _______ ______ _______ ______ ______.
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