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Explain the following term with suitable examples:
'Interstitials'.


Interstitials – Sometime 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 interstitial defect.
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Explain the following terms with suitable examples:
'Schottky defect'

Explain the following term with suitable examples:
'Frenkel defect'

Explain the following term with suitable examples:
'F-centres'.

In terms of band theory, what is the difference between a conductor and a semi-conductor?


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