Microstructure and Thermoelectric Properties of n-type Chalcogenide Nanopowders Sintered by ECAE (Contributo in atti di convegno)

Type
Label
  • Microstructure and Thermoelectric Properties of n-type Chalcogenide Nanopowders Sintered by ECAE (Contributo in atti di convegno) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • S. Ceresara, C. Fanciulli, D. Vasilevskiy (2010)
    Microstructure and Thermoelectric Properties of n-type Chalcogenide Nanopowders Sintered by ECAE
    in ECT 2010, Como, 22-24 / 09 / 2012
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S. Ceresara, C. Fanciulli, D. Vasilevskiy (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-IENI, Corso Promessi Sposi 29, 23900 Lecco, Italy , École Polytechnique de Montréal - Département de Génie Mécanique, H3C 3A7 Montréal, Canada (literal)
Titolo
  • Microstructure and Thermoelectric Properties of n-type Chalcogenide Nanopowders Sintered by ECAE (literal)
Abstract
  • Nanograined powders of Bi1.9Sb0.1Te2.85Se0.15 alloy have been consolidated into bulk ingots by warm ECAE process. Sintering has been achieved after only two ECAE passes at 300 °C, with a total holding time at this temperature of 19 minutes. The morphological characterization of ECAE processed samples, performed by HRTEM, has shown grain sizes varying from 20 to 50 nm. Thermoelectric properties, measured at 300 K show that the thermal conductivity is considerably reduced by the nanostructure, but the value of the Seebeck coefficient is relatively low, due to a non optimized value of the electron concentration. The latter result has been attributed to oxygen contamination. (literal)
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