Question

Dear friends pls explain the terms :


1/ shotckey. Defect.


2/ frankel defect.


This is chapter solid state of matter.

Answer 1

Hey mate you answer ❤️

#1 A Schottky defect is a type of point defect in a crystal lattice named after Walter H. Schottky. In non-ionic crystals it means a lattice vacancy defect. In ionic crystals, the defect forms when oppositely charged ions leave their lattice sites, creating vacancies.

#2 A Frenkel defect or Frenkel disorder is a type of point defect in a crystal lattice. The defect forms when an atom or smaller ion (usually cation) leaves its place in the lattice, creating a vacancy, and becomes an interstitial by lodging in a nearby location.

Answer 2

Heya !
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→ Before coming to the Question , let me explain that these two are the point defects in Stochiometric crystals . These are those compounds in which the number of +ve and -ve ions are exactly in the same ratio as indicated by their chemical formula .

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These defects are classified as -

•Shotckey Defect & •Frenkel Defect



★Shotckey Defect : If some of the atoms or kind are missing from their normal sides and leaves holes give rise to the Shotckey Defect. Due to this defect , the density of Crystal _Decreases_ . This type of appears in crystals of NaCl ( Sodium Chloride ) , KCl , AgBr and CaCl2 .

→ Conditions of this defect -
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(i) Crystals having high Coordination Number .

(ii) Cations and Anions should be of same sizes.


→Consequences of this defect - It Decreases the density of the solid as the volume decreases .


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★Frenkel Defect : This defect arises when an ion is missing from its normal sides and occupies the inter stecial sides. It is found in crystals Like AgCl and ZnS.

→ Conditions of this defect -
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(i) The coordination number is low.

(ii) Anions are larger than cations.


→Consequences of this defect : It doesnt alter the density as the mass and volume remains the same .

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