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  Properties of Crystalline Solids

Properties of Crystalline Solids:

Crystalline solids show a significant property termed as conductivity. Conductivity is the property of a material by which it permits the flow of electric current. Conducting materials are usually categorized into three kinds namely conductors, semi-conductors and super conductors.

Usual metals are good conductors of electricity whereas elements such as silicon and germanium are non-conductors at ordinary temperature. Though, they exhibit appreciable conductivity upon addition of impurities as Boron and Arsenic. The resultant materials are termed as semiconductors. Semi conductors that exhibit conductivity due to the flow of surplus negative electrons are termed as n-type semiconductors. The conductivity due to the positive holes is termed as p-type semiconductors. Semiconductors determine application in modern devices as transistors, rectifiers, & solar cells.

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