Question:
What happens in Schottky defect?
What happens in Schottky defect?
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A Schottky defect is a vacancy defect in which equal numbers of cations and anions are missing.
Updated On: Nov 12, 2026
- The density of crystal increases.
- Unequal number of cations and anions are missing from the lattice.
- Either cation or anion leaves its normal site and occupies interstitial site.
- Equal number of cations and anions are missing from their regular positions in the crystal lattice.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
A Schottky defect is a stoichiometric vacancy defect found in ionic crystals.
Step 2: Features
Equal numbers of cations and anions leave their regular lattice sites, so electrical neutrality is kept.
Step 3: Effect
Vacancies reduce the density of the crystal. A cation or anion moving to an interstitial site is a Frenkel defect.
Step 4: Compare the options
Option (D) describes a Schottky defect.
Final Answer:
In a Schottky defect equal numbers of cations and anions are missing from their regular positions. \[ \boxed{\text{(D) }\text{Equal number of cations and anions are missing from their regular positions in the crystal lattice.}} \]
A Schottky defect is a stoichiometric vacancy defect found in ionic crystals.
Step 2: Features
Equal numbers of cations and anions leave their regular lattice sites, so electrical neutrality is kept.
Step 3: Effect
Vacancies reduce the density of the crystal. A cation or anion moving to an interstitial site is a Frenkel defect.
Step 4: Compare the options
Option (D) describes a Schottky defect.
Final Answer:
In a Schottky defect equal numbers of cations and anions are missing from their regular positions. \[ \boxed{\text{(D) }\text{Equal number of cations and anions are missing from their regular positions in the crystal lattice.}} \]
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