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Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure.

ABSTRACT: Sb-doped Bi2Te3 is known since the 1950s as the best thermoelectric material for near-room temperature operation. Improvements in material performance are expected from nanostructuring procedures. We present a straightforward and fast method to synthesize already nanostructured pellets that show an enhanced ZT due to a remarkably low thermal conductivity and unusually high Seebeck coefficient for a nominal composition optimized for arc-melting: Bi0.35Sb1.65Te3. We provide a detailed structural analysis of the Bi2-xSbxTe3 series (0 ≤ x ≤ 2) based on neutron powder diffraction as a function of composition and temperature that reveals the important role played by atomic vibrations. Arc-melting produces layered platelets with less than 50 nm-thick sheets. The low thermal conductivity is attributed to the phonon scattering at the grain boundaries of the nanosheets. This is a fast and cost-effective production method of highly efficient thermoelectric materials.

SUBMITTER: Serrano-Sanchez F 

PROVIDER: S-EPMC5524901 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Enhanced figure of merit in nanostructured (Bi,Sb)<sub>2</sub>Te<sub>3</sub> with optimized composition, prepared by a straightforward arc-melting procedure.

Serrano-Sánchez F F   Gharsallah M M   Nemes N M NM   Biskup N N   Varela M M   Martínez J L JL   Fernández-Díaz M T MT   Alonso J A JA  

Scientific reports 20170724 1

Sb-doped Bi<sub>2</sub>Te<sub>3</sub> is known since the 1950s as the best thermoelectric material for near-room temperature operation. Improvements in material performance are expected from nanostructuring procedures. We present a straightforward and fast method to synthesize already nanostructured pellets that show an enhanced ZT due to a remarkably low thermal conductivity and unusually high Seebeck coefficient for a nominal composition optimized for arc-melting: Bi<sub>0.35</sub>Sb<sub>1.65<  ...[more]

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