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How does the density of crystal change d...

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

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The density of crystals decreases because certain ions are missing from the lattice.
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Schottky defect is-

In the Schottky defect:

Assertion (A) : The density of crystal having Schottky defect is lowered. Reason (R ) : The crystals suffering from Schottky defect have same number of cation and anions missing from their normal lattice sites.

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

Frenkel defect does not change the density of the ionic crystal whereas, Schottky defect lowers the density of ionic crystal. Give a reason.

Examine the illustration of a portion of the deffective crystal and answer the following question : (a) What are these type of vacancy defects called ? (b) How is the density of a crystal affected by these defects ? (c) Name one ionic compound which can show this type of defect in the crystalline state. (d) How is the stoichiometry of the compound affected ?

How Schottky and Frenkel defects occur in ionic crystals? How does the density of a crystal gets affected by the presence of these defects ?

Examiine the given defective crystal (i) What type of stoichiometric defect is shown by the the crystal ? (ii) How is the density of the crystal affected by this defect ? (iii) What type of ionic substance show such defect ?

Which of the following statement for crystals having Schottky defect is not correct?