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picture1_Plastic Pdf 79131 | 4   Defects In Crystalls 3


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File: Plastic Pdf 79131 | 4 Defects In Crystalls 3
defect in crystals primer in materials science spring 2017 11 05 2017 1 introduction the arrangement of the atoms in all materials contains imperfections which have profound effect on the ...

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                Defect in crystals
                   Primer in Materials Science 
                           Spring 2017
                           11.05.2017                       1
                       Introduction
     The arrangement of the atoms in all materials contains 
        imperfections which have profound effect on the behavior of 
        the materials
     Lattice defects can be sorted into three
        1.  Point defects (vacancies, interstitial defects, substitution defects)
        2.  Line defect (screw dislocation, edge dislocation)
        3.  surface defects (material surface, grain boundaries)
                                                                    2
       Why defect are important?
     There are a lot of properties that are controlled or affected by 
     defects, for example:
         Electric and thermal conductivity in metals (strongly reduced by 
            point defects).
         Electronic conductivity in semi-conductors (controlled by substitution 
            defects).
         Diffusion(controlled by vacancies).
         Ionic conductivity(controlled by vacancies).
         Plastic deformation in crystalline materials (controlled by 
            dislocation).
         Colors(affected by defects).
         Mechanical strength(strongly depended on defects).
                                                                           3
                     Points defects
    Self-interstitial – A self-interstitial is an atom from the crystal that is 
    crowded into an interstitial site, a small void space that under 
    ordinary circumstances is not occupied. 
    the formation of this defect is not highly probable, and it exists in 
    very small concentrations
                                                                        4
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...Defect in crystals primer materials science spring introduction the arrangement of atoms all contains imperfections which have profound effect on behavior lattice defects can be sorted into three point vacancies interstitial substitution line screw dislocation edge surface material grain boundaries why are important there a lot properties that controlled or affected by for example electric and thermal conductivity metals strongly reduced electronic semi conductors diffusion ionic plastic deformation crystalline colors mechanical strength depended points self is an atom from crystal crowded site small void space under ordinary circumstances not occupied formation this highly probable it exists very concentrations...

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