Chap04_Imperfection in Solids

Chap04_Imperfection in Solids - Imperfection in Solids...

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Imperfection in Solids Nothing is perfect. The crystalline structures that we have looked at all have imperfections. We will quantify these imperfections here. Crystalline Defects A crystalline defect is a lattice irregularity having one or more of its dimensions on the order of an atomic dimension. There are 5 major categories of crystalline defects: Zero dimensional: Point defects One dimensional: Linear defects (dislocations) Two dimensional: Planar (surface) defects Three dimensional: Volume (bulk) defects Vibrations Point Defects Point defects allow for diffusion to occur in the solid state. There are different categories of point defects: vacancy These are produced by thermal vibrations of the crystal lattice and/or from need to maintain charge neutrality. self-interstitial or interstitialcy A position on the crystal lattice that is not normally occupied is called an interstitial site. If it is occupied by the same atomic species it is a self-interstitial or self-
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This note was uploaded on 02/20/2012 for the course ENG 210 taught by Professor Moh during the Spring '10 term at Mesa CC.

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Chap04_Imperfection in Solids - Imperfection in Solids...

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