Thermoelectric (TE) materials need high electrical conductivity, high Seebeck coefficient, and low thermal conductivity values at a particular temperature to get high TE performance (i.e. the figure of merit ZT) and are useful in higher efficiency TE devices. In this respect, can the high entropy alloys be useful?
There are a few materials, particularly Heusler alloys which exhibit good thermoelectric properties. eg. Fe2VAl based full heusler alloys and FeVSb ,HfNiSn based half heusler alloys.
These materials exhibit very good power factor. The figure of merit is relatively small due to high thermal conductivity. Presently researchers are trying different techniques to decrease thermal conductivity without compromising the power factor.
Dear Hari,
I am talking about High entropy alloys, which contain 4, 5 and more elements. The structure of these alloys is simple (e.g. FCC) and the atomic fraction of each element is equal or near equal.
Yes, I got your point. But No high entropy alloy known to exhibit good thermoelectric properties. The biggest challenge is their band structure and thermal conductivity. It is almost impossible to have a metallic thermoelectric material. even in heusler alloys good figure of merit is achieved only after doping.
try this link http://thermoelectrics.citrination.com/#/
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