ch. 4 notes

ch. 4 notes - MSE 209 Ch. 4 Crystallographic Defects I....

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MSE 209 Ch. 4 Crystallographic Defects I. Point Defects A. Vacancy- empty lattice site normally occupied by an atom i. Divacancy- 2 vacancies occupying adjacent sites in the crystal lattice ii. Impossible to create crystalline solid above absolute zero without  vacancies iii. Presence of vacancies increases entropy of material B. Vacancy concentration  i. Concentration of defects varies exponentially with temperature C. Interstitial defects i. Self-interstitial- atom normally occupying a lattice site, occupies a site in  between a. Highly strained configuration b. High activation energy to obtain self interstitials ii. Chemical impurities: definitions a. Alloy: a metallic substance composed of two or more elements b. Solid solution: a homogenous crystalline phase that contains two or  more chemical species. Both substitution and interstitial solid  solutions are possible c.
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ch. 4 notes - MSE 209 Ch. 4 Crystallographic Defects I....

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