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12.9 Classification of Materials
All the substances, according to their resistivity and its variation with temperature, are divided into following four classes:
(1) Conductors
These have large number of free electrons (~1028/m3) and small resistivity
(2) Semiconductors
These have fewer conduction electrons and holes (~1016/m3). These have greater resistivity (~3 ´ 103 W m) as compared to metals.
(3) Insulators
These have practically no free electrons. These have very high resistivity.
(4) Superconductors
At low temperatures, the resistance of certain substances becomes exactly zero. These substances are called superconductors and phenomena superconductivity.
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