The crystal with a metal deficiency defect is : (a) ZnO (b) NaCl (c) KCl (d) FeO

Question 56 of 70

Q. The crystal with a metal deficiency defect is :

(a) ZnO

(b) NaCl

(d) FeO

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In FeO, partial oxidation of $Fe^{2+}$ to $Fe^{3+}$ creates iron-ion vacancies to preserve overall charge neutrality, giving a non-stoichiometric, metal-deficient crystal ( $Fe_{0.95}O$ typically) — a hallmark example of the metal deficiency defect.

If some $Fe^{2+}$ ions in the FeO lattice are oxidised to $Fe^{3+}$ , the extra positive charge from each $Fe^{3+}$ means fewer total cations are needed to balance the fixed number of $O^{2-}$ ions, so some cation sites are left vacant — producing a crystal with fewer metal ions than the stoichiometric formula suggests, i.e. a metal-deficiency defect. NaCl and KCl are classic examples of the Schottky defect (equal numbers of cation and anion vacancies, stoichiometry unchanged), not meta …

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Q.The crystal with a metal deficiency defect is :

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