L13Defects145s10r

L13Defects145s10r - Lecture 13: Defects in Crystalline...

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Lecture 13, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Reading assignment : C&R §5.1-5.5; OGC §21.5 Learning objectives: Recognize point defects by type Vacancies Self interstitials Substitutional impurities Interstitial impurities Schottky Anion Frenkel Cation Frenkel • Know how to compute concentrations of intrinsic defects Know the rules for solid solution formation Lecture 13: Defects in Crystalline Materials 1
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Lecture 13, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Defects in Crystalline Solids Disruptions in the periodicity of the crystal structure Point defects Line defects Planar defects Volume defects (Atomic vibrations) Even small concentrations of defects may have major effects on properties Mechanical: dislocations & strain hardening in metals Electrical: doping in semiconductors Thermal: thermal conductivity of solid solutions Optical: color in gemstones 2
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Lecture 13, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Point Defects in Elemental Crystalline Solids [C&R §5.2] Intrinsic defects Vacancy Self-interstitial Extrinsic defects Substitutional impurity Interstitial impurity 3
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Lecture 13, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Point Defects in Ionic Compounds [OGC §21.5; C&R §5.3]
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This note was uploaded on 01/30/2011 for the course EMSE 103 taught by Professor Ggh during the Spring '10 term at Case Western.

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L13Defects145s10r - Lecture 13: Defects in Crystalline...

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