Thermoelectric properties of n-type polycrystalline BixSb2-xTe3 alloys

N. Gerovac, G. J. Snyder, T. Caillat

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Scopus citations

Abstract

(BixSb1-x)2Te3 (.5 < x < .7) polycrystalline samples were synthesized using a combination of melting and powder metallurgy techniques. The samples were hot pressed in graphite dies and cut perpendicular and parallel to the pressing direction. Samples were examined by microprobe analysis to determine their atomic composition. The thermoelectric properties were measured at room temperature in both directions. These properties include Seebeck coefficient, thermal conductivity, electrical resistivity, and Hall effect. The thermoelectric figure-of-merit, ZT, was calculated from these properties. The best ZT was ~.5, given by annealed (Bi.7Sb.3)2Te3. Selected samples were also annealed at various temperatures in an attempt to optimize ZT. The annealing substantially impacted the thermoelectric properties due to a combination of improved crystallinity and changes in defect concentration. These materials could potentially be incorporated into advanced thermoelectric unicouples for a variety of power generation applications.

Original languageEnglish (US)
Title of host publicationProceedings ICT 2002
Subtitle of host publication21st International Conference on Thermoelectrics
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages31-34
Number of pages4
Volume2002-January
ISBN (Electronic)0780376838
DOIs
StatePublished - Jan 1 2002
Event21st International Conference on Thermoelectrics, ICT 2002 - Long Beach, United States
Duration: Aug 25 2002Aug 29 2002

Other

Other21st International Conference on Thermoelectrics, ICT 2002
CountryUnited States
CityLong Beach
Period8/25/028/29/02

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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