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Defects which do not disturb the stoichi...

Defects which do not disturb the stoichiometry are called stochiometric defect. At the time of crystal formation an ion may not occupy its expected position leaving a void or hole at that site. As a metter of fact one positive and one negative ion are missing from their respective positions leaving behind a pair of holes. This vacancy is a Schottky defect. Due to this defect density decreases. Defect arises in which certain atoms or ions have migrated to interstitial position some distance removed from the holes which they vacated. In this case there is no change in the density of the crystal.
In stoichiometric defects, the ratio of positive and negative ions as indicated by chemical formula of the compound

A

Decreases

B

Increases

C

Remains same

D

Cannot be predicted

Text Solution

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The correct Answer is:
C
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Defects which do not disturb the stoichiometry are called stochiometric defect. At the time of crystal formation an ion may not occupy its expected position leaving a void or hole at that site. As a metter of fact one positive and one negative ion are missing from their respective positions leaving behind a pair of holes. This vacancy is a Schottky defect. Due to this defect density decreases. Defect arises in which certain atoms or ions have migrated to interstitial position some distance removed from the holes which they vacated. In this case there is no change in the density of the crystal. In the Schottky defect

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In the Schottky defect:

Explain on brief Schottky defect.

What is Schottky defect in a solid ?

How does the density of crystal change due to Schottky defects ?

Which defect causes decreases in the density of crystal?

Which defect causes decreases in the density of crystal?