Synthesis and thermoelectric properties of the (GeTe) 1-x(PbTe) x alloys

The Ge-rich (GeTe) 1-x(PbTe) x alloys with x = 0.10, 0.14, 0.18 and 0.22 were prepared by induction melting, ball milling and spark plasma sintering techniques. The thermoelectric properties of the samples were investigated. The experimental results show that all samples consist of the solid solutio...

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Bibliographic Details
Published in:Solid state sciences 2011-02, Vol.13 (2), p.399-403
Main Authors: Li, S.P., Li, J.Q., Wang, Q.B., Wang, L., Liu, F.S., Ao, W.Q.
Format: Article
Language:English
Subjects:
Alloys
Coefficients
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Electronic transport in condensed matter
Exact sciences and technology
Figure of merit
Intermetallics
Lead base alloys
Lead tellurides
PbTe-GeTe alloys
Physics
Preparation
Thermal conductivity
Thermoelectric and thermomagnetic effects
Thermoelectric property
Thermoelectricity
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Summary:The Ge-rich (GeTe) 1-x(PbTe) x alloys with x = 0.10, 0.14, 0.18 and 0.22 were prepared by induction melting, ball milling and spark plasma sintering techniques. The thermoelectric properties of the samples were investigated. The experimental results show that all samples consist of the solid solutions of the two phases GeTe and PbTe. The samples are of p-type semiconductors. The existence of PbTe solution in GeTe increases its resistivity and Seebeck coefficient slightly, but reduces its thermal conductivity significantly. As result, the figures of merit for the materials can be enhanced. The maximum figure of merit ZT value of 0.81 was obtained in the sample (GeTe) 0.82(PbTe) 0.18 at 673K. [Display omitted]
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2010.11.045