Thermoelectric Properties of Nanostructured Bismuth-Doped Lead Telluride Bi
x
(PbTe)1−x
Prepared by Co-Ball-Milling |
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Authors: | Oliver Falkenbach David Hartung Peter J Klar Guenter Koch Sabine Schlecht |
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Affiliation: | 1. Institute for Inorganic and Analytical Chemistry, Justus-Liebig-University, Heinrich-Buff-Ring 58, 35392, Giessen, Germany 2. I. Physical Institute, Justus-Liebig-University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
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Abstract: | In this work we present a simple method to synthesize nanostructured, bismuth-doped lead telluride by co-ball-milling. The obtained nanopowders were compacted via either a cold pressing/annealing approach or by hot pressing. The two compacting methods were compared regarding sample density. Series with bismuth content up to 6 at.% were characterized by measuring the thermoelectric transport properties over a wide temperature range between 123 K and 773 K using two different techniques for the Seebeck coefficient and electrical conductivity. A decreasing thermal conductivity and increasing electrical conductivity were found with increasing doping level. The best results were obtained for samples with 5 at.% and 6 at.% bismuth, showing a maximum ZT value of 1.1 at 773 K. Transmission electron microscopy study was performed to analyze the microstructure of the nanopowders, suggesting that, in addition to n-type doping of the lead telluride matrix, segregation effects occur and the samples consist of multiple phases. |
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