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DIFFUSION - Diffusion Chapter5 glassofwater...

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    Diffusion Chapter 5
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Mechanics of Diffusion Primary method by which atoms mix Consider a drop of food coloring in a  glass of water
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Where does Diffusion Occur? Primarily At Defects Point Defects Line Defects Edge Defects Through Interstitial Spaces
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Vacancy Diffusion Vacancies are holes in the matrix Vacancies are always moving An impurity can move into the vacancy Diffuse through the material
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Interstitial Diffusion There are holes between the atoms in  the matrix If the atoms are small enough, they can  diffuse through the interstitial holes Fast!!
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Other Mechanisms Grain Boundaries Surface Be sure to see the animations
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Activation Energy All the kinds of diffusion require a  certain minimum energy to occur Called the activation energy The higher the activation energy, the  harder it is for diffusion to occur
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Activation Energy The highest energy is for volume 
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