Ch05 - Chapter 5 Imperfections in Solids Concept Check 5.1 Question Can Schottky defects exist in K2O If so briefly describe this type of defect If

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Chapter 5 Imperfections in Solids Concept Check 5.1 Question: Can Schottky defects exist in K 2 O? If so, briefly describe this type of defect. If they cannot exist, then explain why. . Answer: This question can be answered in two ways, as follows: (1) Yes, Schottky defects can exist in K 2 O; each defect will consist of one O 2- vacancy and two K + vacancies. (2) No, in the strict sense, Schottky cannot exist in K 2 O if we consider this type of defect to consist of a cation-anion pair; for every O 2- vacancy created there must exist two K + vacancies.
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Concept Check 5.2 Question: What point defects are possible for MgO as an impurity in Al 2 O 3 ? How many Mg 2+ ions must be added to form each of these defects? Answer: For every Mg 2+ ion that substitutes for Al 3+ in Al 2 O 3 , a single positive charge is removed. Thus, in order to maintain charge neutrality, either a positive charge must be added or a negative charge must be removed. Positive charges are added by forming Al
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This note was uploaded on 05/19/2008 for the course MS 4032 taught by Professor Anony during the Spring '08 term at A.T. Still University.

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Ch05 - Chapter 5 Imperfections in Solids Concept Check 5.1 Question Can Schottky defects exist in K2O If so briefly describe this type of defect If

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