How would you account for the following:
Frenkel defects are not found in alkali metal halides.

The frenkel defect is favoured by a large diffrance in size between the positive and negtive ion the metal cation are generally smaller than the anion which occupy the vacant lattice site or hole.

Frenkel defects are not found in alkali metal halides because the ions cannot get into interstitial positions due to their large sizes.

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Schottky defects generate an equal number of cation and anion vacancies while doping produces only cation vacancies and not anion vacancies. Why?

Pure silicon is an insulator. Silicon doped with phosphorus is a semi-conductor. Silicon doped with gallium is also a semiconductor. What is the difference between the two doped silicon semi-conductor?

Examine the illustration of a portion of the defective crystal given below and answer the following questions:
(i) What are these types of vacancy defects called?
(ii) How is the density of a crystal affected by these defects?
(iii) Name one ionic compound which can show this type of defect in the crystalline state.
(iv) How is the stoichiometry of the compound effected?

How would you account for the following:
Schottky defects lower the density of related solids.

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How would you account for the following:Frenkel defects are not found in alkali metal halides.

How would you account for the following:
Frenkel defects are not found in alkali metal halides.