高温會否使金屬的導電性下降?

Question

高温會否使金屬的導電性下降?

或有甚麼金屬會因高温而使導電性下降?

Answer 1

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Higher temperature will definitely make the metal's conductivity decrease.

it's because electron is the charge carrier in metal. when temperature increase, atoms vibrate faster. they will block the current flow, so resistance increase, conductivity decrease.

however, for semi metal, or semiconductor, the conductivity will increase when temperature increase, because more electrons have energy to pass the energy band gap.

many metal in daily life are conductor, so conductivity decrease when temp. increase. such as copper, iron, silver ......

semiconductor include silicon, germanium etc