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Chapter4 - Chapter 4 Point Defects and Diffusion...

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• Introduction Point Defects • Impurities Solid State Diffusion Chapter 4 Point Defects and Diffusion
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Introduction- Defects and Impurities Considering the number of atoms in a cm 3 of crystalline material ( 8.5X10 22 ) it should not be surprising that some atoms will be missing from the lattice. The presence of the missing atoms aids in the atomic transport process in the solid state. Trace elements, impurities, can have a dramatic effect on the properties of a material.
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Point Defects Vacancies and interstitials in a crystalline material
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Point Defects
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Point Defects Vacant lattice site G = H - T S
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