Thermoelectric Properties of Nanostructured Bismuth-Doped Lead Telluride Bi x (PbTe)1−x Prepared by Co-Ball-Milling
| Autor: | Peter J. Klar, Sabine Schlecht, Guenter Koch, Oliver Falkenbach, David Hartung |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Metallurgy Analytical chemistry chemistry.chemical_element Condensed Matter Physics Microstructure Hot pressing Thermoelectric materials Electronic Optical and Magnetic Materials Lead telluride Bismuth chemistry.chemical_compound Thermal conductivity chemistry Seebeck coefficient Thermoelectric effect Materials Chemistry Electrical and Electronic Engineering |
| Zdroj: | Journal of Electronic Materials. 43:1674-1680 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-013-2832-4 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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