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Phys Rev Lett. 2001 May 7;86(19):4350-3.

High performance thermoelectric Tl9BiTe6 with an extremely low thermal conductivity.

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Bell Laboratories, Lucent Technologies, Mountain Avenue, Murray Hill, New Jersey 07974, USA.


Tl 9BiTe (6) exhibits a thermoelectric figure of merit of ZT approximately 1.2 around 500 K, which significantly exceeds the state-of-the-art materials in this temperature range. The extraordinary thermoelectric performance is mainly due to the extremely low thermal conductivity of Tl 9BiTe (6) [ 0.39 W/(m times K) at 300 K]. In fact, the minimum lifetime of the phonons has to be taken into account to describe the thermal conductivity data.

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