Crystal Defects & Diffusion

Crystal Defects & Diffusion - Crystal Defects and...

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Crystal Defects and Noncrystalline Structure Chapter 4
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No Perfect World in Crystals • What are factors that affect a diamond’s clarity? Chemical impurity – No material can be prepared without some degree of chemical impurity. – Resulting in solid solution , the mechanism for the metal alloying Structural flaws (defects) Grain Boundary glass matrix (ZnSe) zinc selenide crystal
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Liquid Solution and Solid Solution Both liquid and solid solutions are formed thru a mechanism called diffusion Solid solution of nickel in copper Solvent Solute
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Crystal Imperfections Crystal Impurities Substitutional solid solutions Interstitial solid solutions Crystal Defects – Point defects – Line defects – Area defects – Noncrystalline (3D)
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Substitutional Crystal impurities Substitutional solid solutions Interstitial solid solutions Interstitial
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Crystal Defects Point defects –Vacancy – Interstitial Line defects – Edge dislocation – Screw dislocation – Mixed dislocation Planar (Area) defects – Grain boundaries 3D Imperfections – Non-crystalline (amorphous) structure
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Interstitial atom Imperfection pairs Vacancy Point Defects
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Crystal Defects & Diffusion - Crystal Defects and...

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