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Ch_5_Diffusion_in_Solids_amended_Compatibility_Mode_

Ch_5_Diffusion_in_Solids_amended_Compatibility_Mode_ -...

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1 INTRODUCTION TO MATERIALS SCIENCE PSMMY Jan2010 1 Learning Outcomes Today… what do I want you to learn? Name and describe the two atomic mechanisms of diffusion. Discuss on the factors that affect diffusion PSMMY Jan2010 2 Discuss on the factors that affect diffusion process. Distinguish between steady-state and non-steady state diffusion. Write Fick’s first law in equation form, and define all parameters. Learning Outcomes Note the kind of diffusion for which Fick’s first law is applied. Today… what do I want you to learn? PSMMY Jan 2006 3 Apply Fick’s first law to steady-state diffusion problems. Calculate the diffusion coefficient for some material at a specified temperature, given the appropriate diffusion constants. TODAY… PSMMY Jan2010 4 DIFFUSION 9 movement of atoms/ions/electrons/holes within the material caused by concentration gradient and temperature. PSMMY Jan2010 5 9 2 conditions must be met there must be an empty adjacent site the atom must have sufficient energy to break bonds with its neighbouring atoms Types of Diffusion 1. inter-diffusion or impurity diffusion
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