5.1 - + E motion 2. Random Walk o This involves an atom...

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For a vacancy: n v = Ce – (Ev) /kT n sites where E v is the activation energy required to form the vacancy There are only two mechanisms by which diffusion may occur in solids 1. Vacancy Migration o Atoms move from a normal lattice position to a vacancy in the crystal lattice o Q vacancy migration = E vacancy formation
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Unformatted text preview: + E motion 2. Random Walk o This involves an atom moving from one interstitial position to another in the crystal lattice o Not a common mechanism for self-diffusion o Usually faster than vacancy migration because atoms are smaller o Q random walk = E motion...
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