
(a)
Interpretation:
Substitution of Mg2+ for yttrium ions in Y2O3 causes the point defect in Y2O3 structure. Changes required in structure to maintain charge balance are to be explained.
Concept Introduction:
Point defect can be defined as the missing of an atom from its crystal lattice or presence at irregular place in its crystal lattice. Point defects can be of many types such as self-interstitial atoms, interstitial impurity atoms, vacancies, and substitution atoms.
(b)
Interpretation:
Substitution of Fe3+ for magnesium ions in MgO causes the point defect in MgO structure. Changes required in structure to maintain charge balance is to be explained.
Concept Introduction:
Point defect can be defined as the missing of an atom from its crystal lattice or presence at irregular place in its crystal lattice. Point defects can be of many types such as self-interstitial atoms, interstitial impurity atoms, vacancies, and substitution atoms.
(c)
Interpretation:
Substitution of Li1+ for magnesium ions in MgO causes the point defect in MgO structure. Changes required in structure to maintain charge balance is to be explained.
Concept Introduction:
Point defect can be defined as the missing of an atom from its crystal lattice or presence at irregular place in its crystal lattice. Point defects can be of many types such as self-interstitial atoms, interstitial impurity atoms, vacancies, and substitution atoms.
(d)
Interpretation:
Substitution of Fe2+ for sodium ions in NaCl causes the point defect in NaCl structure. Changes required in structure to maintain charge balance is to be explained.
Concept Introduction:
Point defect can be defined as the missing of an atom from its crystal lattice or presence at irregular place in its crystal lattice. Point defects can be of many types such as self-interstitial atoms, interstitial impurity atoms, vacancies, and substitution atoms.

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