quiz3s02 - Home Introduction Policies Resources...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Quiz#3 1. Vacancies are equilibrium defects because
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a. formation energy of each vacancy is negative b. entropy of mixing is high to make the total free energy of all vacancies negative c. entropy of formation of vacancies is negative ( b) 2. Most important condition to be staisfied when point defects form in ionic crystals is a. free energy of defects should be negative b. charge neutrality should be maintained for the complete crystal c. both Schottky and Frenkel defects should form (b ) 3. Match the following for defects in ionic solids a. vacancies of cations and anions . ..................... Frenkel defect (b ) b. vacancy and interstitial of the same ion . ......... Schottky defect (a ) 4. Small size impurity atoms occupy a. lattice sites b. interstitial sites c. both lattice and interstitial sites . ...... (b ) 5. The concentration of vacancies at higher temperature is
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quiz3s02 - Home Introduction Policies Resources...

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