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Synthesis of alloyed Bi2TexSe(3-x) nanoparticles and thermoelectric characterization of bulk nanostructured materials obtained by their assembly

Published online by Cambridge University Press:  18 May 2015

Romain Bude ,
Laurent Divay ,
Renato Bisaro ,
Bernard Servet ,
Elodie Leveugle ,
Frédéric Wyczisk ,
Dominique Carisetti ,
Afshin Ziaei  and
Christophe Galindo
Romain Bude
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Laurent Divay*
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Renato Bisaro
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Bernard Servet
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Elodie Leveugle
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Frédéric Wyczisk
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Dominique Carisetti
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Afshin Ziaei
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
Christophe Galindo
Affiliation:
Thales Research and Technology, Campus Polytechnique, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France
*
*email of corresponding author: laurent.divay@thalesgroup.com
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Abstract

The optimization of the figure of merit of thermoelectric materials requires the simultaneous control of the material composition and microstructure. Assembly of nanoparticles obtained by a solution route is an attractive bulk fabrication method because size and shape of the nanoparticles can be tuned by variation of the synthesis conditions. Recently, new synthetic pathways were reported among which reducing agent assisted, surfactant free processes. We report here the evaluation of this method for the synthesis of Bi2TexSe3-x alloyed nanoparticles with varying selenium concentrations. X-ray diffraction studies conducted on powder and pellet samples show that two alloyed phases are present in the sample even at low selenium content. The careful study of the position of the diffraction peaks as function of the formulation shows that this behaviour could arise from the difference in reactivity of selenium and tellurium. Moreover, the electrical conductivity of the samples is shown to increase upon selenium addition while the Seebeck coefficient is reduced. Power factor shows an optimum value around 20% selenium content with a large tolerance in composition.

Keywords

thermoelectricnanostructurechemical synthesis
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1804: Symposium RR – Solution Syntheses of Inorganic Functional/Multifunctional Materials , 2015 , pp. 1 - 6
Copyright
Copyright © Materials Research Society 2015 

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References

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