The properties of Te-doped and Te-Ni double-doped nanostructured skutterudites were evaluated by means of x-ray powder diffraction, and transport properties measured on the synthesized samples have been compared with ab initio theoretical modeling. Theoretical optimal dopant contents have been evaluated according to the maximum value of the power factor, calculating the electronic transport properties from the ab initio material band structure using semiclassical Boltzmann transport theory. The samples have been synthesized by chemical alloying with Te substitution for Sb up to and Ni substitution for Co up to . X-ray powder diffraction has been performed on all samples to reveal information about phase purity and Rietveld refinement was performed for the phase composition and cell parameter. The thermoelectric properties of the resulting consolidates were investigated in a temperature range from using various measurement facilities. A standardization and round robin program was started among the participating evaluation laboratories in order to ensure reliability of the data obtained. The significant reduction in thermal conductivity, when compared to highly annealed , could be proved which is caused by the nanostructuring, resulting in a high concentration of grain boundaries. A combination of substitution levels for Ni and Te has been found resulting in the largest value of 0.65 at among unfilled skutterudite materials.
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15 February 2005
Research Article|
January 28 2005
Nanostructured skutterudites: Theoretical modeling, synthesis and thermoelectric properties
Christian Stiewe;
Christian Stiewe
a)
German Aerospace Center (DLR)
, Linder Hoehe, 51147 Cologne, Germany
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Luca Bertini;
Luca Bertini
Istituto di Scienze e Tecnologie Molecolari (ISTM)
, Via Camillo Golgi 19, 20133 Milano, Italy
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Muhammet Toprak;
Muhammet Toprak
Royal Institute of Technology (KTH)
, Stockholm, Sweden
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Mogens Christensen;
Mogens Christensen
University of Aarhus
, Department of Chemistry, DK-8000 Aarhus C, Denmark
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Dieter Platzek;
Dieter Platzek
German Aerospace Center (DLR)
, Linder Hoehe, 51147 Cologne, Germany
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Simon Williams;
Simon Williams
NEDO Laboratory for Thermoelectric Engineering (NEDO)
, Cardiff, United Kingdom
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Carlo Gatti;
Carlo Gatti
Istituto di Scienze e Tecnologie Molecolari (ISTM)
, Via Camillo Golgi 19, 20133 Milano, Italy
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Eckhard Müller;
Eckhard Müller
German Aerospace Center (DLR)
, Linder Hoehe, 51147 Cologne, Germany
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Bo B. Iversen;
Bo B. Iversen
University of Aarhus
, Department of Chemistry, DK-8000 Aarhus C, Denmark
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Mamoun Muhammed;
Mamoun Muhammed
Royal Institute of Technology (KTH)
, Stockholm, Sweden
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Michael Rowe
Michael Rowe
NEDO Laboratory for Thermoelectric Engineering (NEDO)
, Cardiff, United Kingdom
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Christian Stiewe
a)
Luca Bertini
Muhammet Toprak
Mogens Christensen
Dieter Platzek
Simon Williams
Carlo Gatti
Eckhard Müller
Bo B. Iversen
Mamoun Muhammed
Michael Rowe
German Aerospace Center (DLR)
, Linder Hoehe, 51147 Cologne, Germanya)
Electronic mail: [email protected]
J. Appl. Phys. 97, 044317 (2005)
Article history
Received:
July 16 2004
Accepted:
November 30 2004
Citation
Christian Stiewe, Luca Bertini, Muhammet Toprak, Mogens Christensen, Dieter Platzek, Simon Williams, Carlo Gatti, Eckhard Müller, Bo B. Iversen, Mamoun Muhammed, Michael Rowe; Nanostructured skutterudites: Theoretical modeling, synthesis and thermoelectric properties. J. Appl. Phys. 15 February 2005; 97 (4): 044317. https://doi.org/10.1063/1.1852072
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