Thermoelectric properties of n-type polycrystalline BixSb2-xTe3 alloys

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

doi:10.1109/ICT.2002.1190259

Thermoelectric properties of n-type polycrystalline Bi_xSb_2-xTe₃ alloys

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

Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

17 Scopus citations

Abstract

(Bi_xSb_1-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 language	English (US)
Title of host publication	Proceedings ICT 2002
Subtitle of host publication	21st International Conference on Thermoelectrics
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	31-34
Number of pages	4
ISBN (Electronic)	0780376838
DOIs	https://doi.org/10.1109/ICT.2002.1190259
State	Published - 2002
Event	21st International Conference on Thermoelectrics, ICT 2002 - Long Beach, United States Duration: Aug 25 2002 → Aug 29 2002

Publication series

Name	International Conference on Thermoelectrics, ICT, Proceedings
Volume	2002-January

Other

Other	21st International Conference on Thermoelectrics, ICT 2002
Country/Territory	United States
City	Long Beach
Period	8/25/02 → 8/29/02

ASJC Scopus subject areas

Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/ICT.2002.1190259

Cite this

Gerovac, N., Snyder, G. J., & Caillat, T. (2002). Thermoelectric properties of n-type polycrystalline Bi_xSb_2-xTe₃ alloys. In Proceedings ICT 2002: 21st International Conference on Thermoelectrics (pp. 31-34). Article 1190259 (International Conference on Thermoelectrics, ICT, Proceedings; Vol. 2002-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICT.2002.1190259

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author = "N. Gerovac and Snyder, {G. J.} and T. Caillat",

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Gerovac, N, Snyder, GJ & Caillat, T 2002, Thermoelectric properties of n-type polycrystalline Bi_xSb_2-xTe₃ alloys. in Proceedings ICT 2002: 21st International Conference on Thermoelectrics., 1190259, International Conference on Thermoelectrics, ICT, Proceedings, vol. 2002-January, Institute of Electrical and Electronics Engineers Inc., pp. 31-34, 21st International Conference on Thermoelectrics, ICT 2002, Long Beach, United States, 8/25/02. https://doi.org/10.1109/ICT.2002.1190259

Thermoelectric properties of n-type polycrystalline Bi_xSb_2-xTe₃ alloys. / Gerovac, N.; Snyder, G. J.; Caillat, T.
Proceedings ICT 2002: 21st International Conference on Thermoelectrics. Institute of Electrical and Electronics Engineers Inc., 2002. p. 31-34 1190259 (International Conference on Thermoelectrics, ICT, Proceedings; Vol. 2002-January).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AB - (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.

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