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In which type of point defect are the cations and anions absent in stoichiometric proportions?
- a)Schottky defect
- b)Frenkel defect
- c)Impurity defect
- d)The given situation does not occur for any point defect.
Correct answer is option 'A'. Can you explain this answer?
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In which type of point defect are the cations and anions absent in sto...
Schottky Defect:
A Schottky defect is a type of point defect that occurs in ionic solids. In this defect, both cations and anions are absent from their regular sites in stoichiometric proportions.
Explanation:
When an ionic crystal contains an equal number of cations and anions, it is said to be stoichiometric. In a Schottky defect, some cations and anions are missing from their regular sites. This means that the crystal is no longer stoichiometric.
In a Schottky defect, some cations and anions leave their sites and move into interstitial sites or vacancies. The number of cations and anions missing is equal, so the crystal remains electrically neutral.
This type of defect is common in ionic compounds with high coordination numbers, such as NaCl, KCl, and CsCl. The defect lowers the density of the crystal, and it can also affect its electrical and thermal conductivity.
Examples:
- In NaCl, one Na+ and one Cl- ion leave their sites and move into interstitial sites. The crystal remains neutral, with one vacancy for every interstitial ion.
- In CsCl, one Cs+ and one Cl- ion leave their sites and move into interstitial sites. Again, the crystal remains neutral, with one vacancy for every interstitial ion.
Conclusion:
In conclusion, a Schottky defect is a type of point defect that occurs in ionic solids when cations and anions are absent from their regular sites in stoichiometric proportions. It is a common defect in ionic compounds with high coordination numbers, and it can affect the density, electrical, and thermal conductivity of the crystal.
A Schottky defect is a type of point defect that occurs in ionic solids. In this defect, both cations and anions are absent from their regular sites in stoichiometric proportions.
Explanation:
When an ionic crystal contains an equal number of cations and anions, it is said to be stoichiometric. In a Schottky defect, some cations and anions are missing from their regular sites. This means that the crystal is no longer stoichiometric.
In a Schottky defect, some cations and anions leave their sites and move into interstitial sites or vacancies. The number of cations and anions missing is equal, so the crystal remains electrically neutral.
This type of defect is common in ionic compounds with high coordination numbers, such as NaCl, KCl, and CsCl. The defect lowers the density of the crystal, and it can also affect its electrical and thermal conductivity.
Examples:
- In NaCl, one Na+ and one Cl- ion leave their sites and move into interstitial sites. The crystal remains neutral, with one vacancy for every interstitial ion.
- In CsCl, one Cs+ and one Cl- ion leave their sites and move into interstitial sites. Again, the crystal remains neutral, with one vacancy for every interstitial ion.
Conclusion:
In conclusion, a Schottky defect is a type of point defect that occurs in ionic solids when cations and anions are absent from their regular sites in stoichiometric proportions. It is a common defect in ionic compounds with high coordination numbers, and it can affect the density, electrical, and thermal conductivity of the crystal.
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In which type of point defect are the cations and anions absent in sto...
A vacancy defect is when an atom, ion or molecule is absent from its position in the lattice. When this occurs for ionic solids, it is called a Schottky defect. Cations and anions are found to be absent in stoichiometric proportion so that the electrical neutrality of the crystal is maintained.
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In which type of point defect are the cations and anions absent in stoichiometric proportions?a)Schottky defectb)Frenkel defectc)Impurity defectd)The given situation does not occur for any point defect.Correct answer is option 'A'. Can you explain this answer?
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