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Compositional And Structural Modifications In Ternary Bismuth Chalcogenides And Their Thermoelectric Properties

Published online by Cambridge University Press:  01 February 2011

Duck-Young Chung ,
Melissa A. Lane ,
John R. Ireland ,
Paul W. Brazis ,
Carl R. Kannewurf  and
Mercouri G. Kanatzidis
Duck-Young Chung
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824.
Melissa A. Lane
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824.
John R. Ireland
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824.
Paul W. Brazis
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824.
Carl R. Kannewurf
Affiliation:
Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208
Mercouri G. Kanatzidis
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824.
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Abstract

Based on the versatile combination of PbQ- and Bi2Q3-type (Q = S, Se, Te) fragments, we explored new compounds in the Pb/Bi/Se ternary system. The new class of compounds, Pb5Bi6Se14, Pb5Pb12Se23, and PbBi8Se13 are homologues with different combination of alternating Bi2Se3- and PbSe-type layers. α- and β-Pb6Bi2Se9 were obtained in different synthetic conditions and the former is isostructural to heyrovskyite (Pb6Bi2S9) while the latter is a NaCl-type cubic phase. Pb5Bi6Se14 shows a power factor of 11.2 μW/cm·K2 with electrical conductivity of 657 S/cm and thermopower of -131 μV/K at 271 K. The most significant characteristic of this material is the extremely low thermal conductivity of less than 1.0 W/m·K at room temperature. On the basis of these properties, a preliminary doping study for Pb5Bi6Se14 with Sn, Sb, and SbBr3 as dopants was undertaken and the results are presented in this report.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 626: Symposium Z – Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications , 2000 , Z7.4
Copyright
Copyright © Materials Research Society 2000

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References

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