which point defect is observed in a crystal when a vacancy is created by an atom missing from a lattice site ?
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Answer:
Vacancy defect (in case of ionic crystal it will be Schottky defect).
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Answer:
When a vacancy is created by an atom missing from a lattice site. That point defect is Schottky point defect.
Explanation:
Schottky defect is a point defect found in ionic solids. It is a stoichiometry defect in which no change or distort the stoichiometry of the solid.
- In this defect vacancy is created by same number of cations and anions missing from the solid,
- Since the number of missing cations and anions are the same. Therefore, the overall crystal will be electrical neutrality.
- This defect was discovered by a German physicist Walter H. Schottky. This defect occurs when in ionic crystals the oppositely charged ions leave their lattice sites and vacancies are created.
- Due to this defect, the decrease in the density of the ionic crystal as some ions left the crystal.
- This defect is found in only those ionic solids ionic solid in which cation and anion have similar size.
- Schottky defect is found in compounds such as KCl, KBr, AgBr, NaCl, CsCl, KCl, KBr, etc.
To learn more about "What are point defects"
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