Publication

Figure of merit of quasicrystals: the case of Al-Cu-Fe

Davor Pavuna
2001
Journal Articles

Abstract

Quasicrystals exhibit low thermal and moderate electrical conductivity, accompanied by a relatively high absolute magnitude of thermopower, which makes them suitable candidates for use as thermoelectric devices. Theoretical explanations of electrical and thermal conductivity and thermopower of two representative members of the Al-Cu-Fe icosahedral quasicrystal family (i-Al62Cu25.5Fe12.5 and i-Al63Cu25Fe12) are given. Their figures of merit are relatively low compared with the best-known thermoelectric materials.

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https://infoscience.epfl.ch/entities/publication/9857755c-5b59-41a9-b3f7-7f883f92112b

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Davor Pavuna
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/9857755c-5b59-41a9-b3f7-7f883f92112b

About this result

Related concepts (31)

Thermoelectric materials

Thermoelectric materials show the thermoelectric effect in a strong or convenient form. The thermoelectric effect refers to phenomena by which either a temperature difference creates an electric potential or an electric current creates a temperature difference. These phenomena are known more specifically as the Seebeck effect (creating a voltage from temperature difference), Peltier effect (driving heat flow with an electric current), and Thomson effect (reversible heating or cooling within a conductor when there is both an electric current and a temperature gradient).

Quasicrystal

A quasiperiodic crystal, or quasicrystal, is a structure that is ordered but not periodic. A quasicrystalline pattern can continuously fill all available space, but it lacks translational symmetry. While crystals, according to the classical crystallographic restriction theorem, can possess only two-, three-, four-, and six-fold rotational symmetries, the Bragg diffraction pattern of quasicrystals shows sharp peaks with other symmetry orders—for instance, five-fold.

Thermoelectric effect

The thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa via a thermocouple. A thermoelectric device creates a voltage when there is a different temperature on each side. Conversely, when a voltage is applied to it, heat is transferred from one side to the other, creating a temperature difference. At the atomic scale, an applied temperature gradient causes charge carriers in the material to diffuse from the hot side to the cold side.

Related publications (3)

Figure of merit of quasicrystals: the case of Al-Cu-Fe

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