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Stability and Thermoelectric Property of Cu9Fe9S16: Sulfide Mineral as a Promising Thermoelectric Material

Published online by Cambridge University Press:  30 July 2014

Naohito Tsujii  and
Takao Mori
Naohito Tsujii
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Ibaraki, Japan,
Takao Mori
Affiliation:
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan.
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Abstract

Thermoelectric materials based on non-toxic and earth-abundant elements are important from the viewpoint of energy harvesting from the widely-spread waste heat. We have investigated the thermoelectric properties of Cu9Fe9S16, known as the natural mineral mooihoekite or talnakhite. Seebeck coefficient shows a large negative value of about -140 μV/K around room temperature. Thermal conductivity is found to be as small as 2.0 W/Km above 100 K, which is attributed to the large unit cell and the complicated crystal structure. Our results indicate that Cu9Fe9S16 can make a high-performance and environmentally-friendly thermoelectric material if the concentration of carriers, especially holes, is reduced.

Keywords

thermoelectricenvironmentally benignelectronic material

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References

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