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प्रश्न
Write the consequences of Schottky defect with reasons.
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उत्तर
Consequences of Schottky defects are:
- As the number of ions decreases, mass decreases. However, volume remains unchanged. Hence, the density of a substance decreases.
- The number of missing cations and anions is equal, and the electrical neutrality of the compound is preserved.
- This defect is found in ionic crystals such as NaCl, AgBr and KCl.
- Since some ions are missing from the crystal lattice, the mass of the crystal decreases without a corresponding change in volume.
- The overall density of the crystal decreases.
- Equal numbers of positive and negative ions are missing, so there is no net charge.
- The electrical neutrality of the crystal is preserved.
- The ratio of cations to anions remains the same because equal numbers are missing.
- The chemical formula of the compound remains unchanged.
- The presence of vacant sites may allow ions to move slightly under an electric field.
- There is a small increase in ionic conductivity, especially at higher temperatures.
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संबंधित प्रश्न
Explain with diagram, the vacancy defect.
How are nonstoichiometric point defects classified? Explain with diagram the metal deficiency defect.
What is a substitutional impurity defect?
Explain solid solutions of metals and vacancy through aliovalent cations.
Which of the following is an example of substitutional impurity defect?
When a cation or anion from ionic solid leaves its regular lattice site and moves to occupy an interstitial site, it is called as ____________.
Which among the following solids shows Frenkel defect?
Which of the following match is CORRECT?
(I) Frenkel defect: Electrical neutrality of the compound is preserved.
(II) Schottky defect: Density of the substance decreases.
(III) Schottky defect: Combination of vacancy defect and interstitial defect.
(IV) Frenkel defect: Small difference between size of cation and anion.
Which among the following defects is observed in Brass?
Schottky defect is formed in ionic compounds with ____________.
Explain metal deficiency defect with examples.
Name a compound where Frenkel defect is found.
In which among the following solids, Schottky defect is not observed?
When electrons are trapped into the crystal in anion vacancy, the defect is known as ______.
Explain the following term:
Substitutional impurity defect
Explain Self interstitial defect in elemental solid.
What is a crystal defect?
Explain the interstitial defect.
Give the disadvantages of a vacancy defect.
What are point defects?
