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1. The Solid State
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Q23 of 68 Page 30

Explain the following terms with suitable examples:

Interstitials

Sometimes in the formation of lattice structure some of the atoms or ions occupy vacant interstitial site, and are known as interstitials. These interstitials are generally small size non- metals, such as H, B, C, etc. Defect arises because of interstitials is called the interstitial defect.


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23

Explain the following terms with suitable examples:

Schottky defect

23

Explain the following terms with suitable examples:

Frenkel defect

23

Explain the following terms with suitable examples:

F-centres.

24

Aluminium crystallises in a cubic close-packed structure. Its metallic radius is 125 pm.

(i) What is the length of the side of the unit cell?


(ii) How many unit cells are there in 1.00 cm3 of aluminium?

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1. The Solid State
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