Thermoelectric Materials: New Approaches to an Old Problem

Physics Today - Tập 50 Số 3 - Trang 42-47 - 1997
G. D. Mahan1, B. C. Sales, Jeff Sharp2
1University of Tennessee, Knoxville
2Marlow Industries, Dallas, Texas

Tóm tắt

Thermoelectrics is an old field. In 1823, Thomas Seebeck discovered that a voltage drop appears across a sample that has a temperature gradient. This phenomenon provided the basis for thermocouples used for measuring temperature and for thermoelectric power generators. In 1838, Heinrich Lenz placed a drop of water on the junction of metal wires made of bismuth and antimony. Passing an electric current through the junction in one direction caused the water to freeze, and reversing the current caused the ice to quickly melt; thus thermoelectric refrigeration was demonstrated (figure 1).

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Physics Today

Tập 50 Số 3

42-47

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