Question:
A cation vacancy and an anion vacancy in a crystal of type AB is called
A cation vacancy and an anion vacancy in a crystal of type AB is called
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Schottky defect consists of equal numbers of cation and anion vacancies, so electrical neutrality is maintained.
Updated On: May 7, 2026
- Frenkel defect
- Schottky defect
- Pairs of vacancies
- Line imperfection
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The Correct Option is B
Solution and Explanation
In an ionic crystal of type \(AB\), there are equal numbers of cations and anions.
A Schottky defect occurs when equal number of cations and anions are missing from their normal lattice sites.
This creates a pair of vacancies:
\[
\text{one cation vacancy}
\]
and
\[
\text{one anion vacancy}.
\]
This defect maintains electrical neutrality of the crystal.
For example, in a crystal like \(NaCl\), if one \(Na^+\) ion and one \(Cl^-\) ion are missing, the defect is Schottky defect.
Frenkel defect occurs when an ion leaves its normal site and occupies an interstitial site.
Line imperfection refers to dislocations.
Therefore, a cation vacancy and an anion vacancy in an \(AB\) crystal is called:
\[
\text{Schottky defect}.
\]
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