6- Imperfections I

6- Imperfections I - An Imperfect World An Imperfect World...

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n Imperfect World An Imperfect World Are crystal defects good or bad? • Defects in crystals – Mechanical properties – Optical properties – Electronic properties
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Chapter 4 perfections in the Atomic and Imperfections in the Atomic and Ionic Arrangements Learning Objectives lassify describe illustrate imperfections in crystal structures Classify, describe, illustrate imperfections in crystal structures • Describe the influence of imperfections on materials properties Copyright © 2006 by Nelson, a division of Thomson Canada Limited 4-2
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4-1 Point Defects oint defects re local disruptions of the crystal lattice Although they may be Point defects are local disruptions of the crystal lattice. Although they may be defined in terms of a single lattice site, points defects structurally influence neighboring sites. Impurities and dopants represent point defects associated with atoms or ions of different composition. purities exist as natural • Impurities exist as natural constituents or arise from processing. • Dopants are purposefully introduced. Copyright © 2006 by Nelson, a division of Thomson Canada Limited 4-3
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4-1 Point Defects -vacancies Copyright © 2006 by Nelson, a division of Thomson Canada Limited 4-4
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terstitial defects rise from the Interstitial defects arise from the presence of a different atom at a site different from those of the crystal structure. xample: carbon in iron
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This note was uploaded on 09/06/2011 for the course EMA 3010 taught by Professor Unknown during the Fall '08 term at University of Florida.

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6- Imperfections I - An Imperfect World An Imperfect World...

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