Question:
Schottky defect in a crystal is observed when
Schottky defect in a crystal is observed when
Updated On: Jul 28, 2022
- an ion leaves its normal site and occupies an interstitial site
- unequal number of cations and anions are missing from the lattice
- density of the crystal is increased
- equal number of cations and anions are missing from the lattice
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The Correct Option is D
Solution and Explanation
In Schottky defect, equal number of cations and anions are missing from the lattice. Due to this defect, density of crystal decreases.
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Concepts Used:
Imperfections in Solids
Any irregularity in the pattern of crystal arrangement in a solid lattice is called imperfection in solids. The occurrence of defects takes place when crystallization (the process of formation of crystals) occurs at a very fast or at an intermediate rate.
Basically, defects fall out in two forms:
- Point Defect
When the irregularities exist from the ideal arrangement around a point or an atom in solids, the defect is known as a point defect. Types of point defects are:
- Stoichiometric defects
- Non-stoichiometric defects
- Impurity defects
- Line Defect
When the deviation from the ideal arrangement exists in the entire row of lattice points, the defect is called line defect.