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The Solid State
Question
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What is the difference between Schottky defects and Frenkel defects?

Answer

Schottky defects

Frenkel defects

1. It arises due to vacancy at a cation site and at a nearby anion site in an ionic solid.

2. Overall density of the crystal decreases.

3. It arises in ionic solids having high co-ordination number.

4.Example: NaCl, KCl, CsCl etc.

1. It arises when a cation leaves its lattice site and enters in an interstitial site in an ionic solid.

2. There is no change in the overall density.

3. It arieses in ionic solids having large anions and small cations.

 
Example: ZnS, AgCl, AgI etc

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Some More Questions From The Solid State Chapter

Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

Why is glass considred a super-cooled liquid?

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show clevage property?

Classify the following solids in different categories based on the nature of intermolecular forces operating in them:
Potassium sulphate, tin, benzene, urea, ammonia, water, zinc
sulphate, graphite, rubidium, argon, silicon carbide.

Solid A is a very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

Ionic solids conduct electricity in liquid state but not in solid state. Explain.

What type of solids are electrical conductors, malleable and ductile?

Give the significance of a 'lattice point'.

Name the parameters that characterize a unit cell.

Distinguish between Hexagonal and monoclinic unit cells.