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Structure and Thermoelectric Properties of New Layered Compounds in the Quaternary System Cs-Pb-Bi-Te

Published online by Cambridge University Press:  21 March 2011

Kuei-Fang Hsu ,
Duck-Young Chung ,
Sangeeta Lal ,
Tim Hogan  and
Mercouri G. Kanatzidis
Kuei-Fang Hsu
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824, USA
Duck-Young Chung
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824, USA
Sangeeta Lal
Affiliation:
Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, USA
Tim Hogan
Affiliation:
Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, USA
Mercouri G. Kanatzidis
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824, USA
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Abstract

By introducing of various equivalents of PbTe into the layered framework of CsBi4Te6, the four new compounds CsPbBi3Te6 (1), CsPb2Bi3Te7 (2), CsPb3Bi3Te8 (3) and CsPb4Bi3Te9 (4), were discovered. The compounds adopt layered structures built up of anionic slabs of progressively increasing thickness. The [PbmBi3Te5+m]- (m = 1, 2, 3, 4) slabs in the four structures can be viewed as fragments excised from the PbTe-type structures with 4-, 5-, 6- and 7-monolayers, respectively. As prepared, these materials are off-stoichiometric and n-type conductors. We present preliminary results of the crystal structures and thermoelectric properties of these materials and classify them as members of the new homologous series CsPbmBi3Te5+m (m = 1 to 4).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 691: Symposium G – Thermoelectric Materials 2001--Research and Applications , 2001 , G8.25
Copyright
Copyright © Materials Research Society 2002

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References

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