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Electrical resistivity modulation of thermoelectric iron based nanocomposites

Music, Denis (author)
Rhein Westfal TH Aachen, Germany
Schmidt, Paul (author)
Rhein Westfal TH Aachen, Germany
Czigany, Zsolt (author)
Hungarian Acad Sci, Hungary
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Greczynski, Grzegorz (author)
Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
Geyer, Richard W. (author)
Rhein Westfal TH Aachen, Germany
Hans, Marcus (author)
Rhein Westfal TH Aachen, Germany
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 (creator_code:org_t)
PERGAMON-ELSEVIER SCIENCE LTD, 2018
2018
English.
In: Vacuum. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0042-207X .- 1879-2715. ; 157, s. 384-390
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Iron oxides are promising thermoelectrics, but their high electrical resistivity impedes broader applications. In this work, we have studied Fe oxides with metallic contributions. Pt and Ir additions are also considered to enhance the valence electron concentration and further modify the transport properties. Based on density functional theory explorations, Fe based clusters (Fe-3, Fe-4, and Fe3Pt) are suggested to act as nucleation sites for metallic crystallites, while O leads to formation of an amorphous matrix. This has been validated by transmission electron microscopy and x-ray photoelectron spectroscopy of sputter-grown Fe-Pt-Ir-O thin films. Densely packed bcc Fe grains, approx. 2-3 nm in diameter, are embedded in an amorphous Fe-O matrix in the as-grown state. The Seebeck coefficient reaches even -411 mu V K-1 and the electrical resistivity is up to 5 orders of magnitude lower than that of previously reported literature data on Fe oxides. We suggest that this peculiarity of our films is due to finite states localized at the Fermi level in these nanocomposites.

Subject headings

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Keyword

Thermoelectric; Nanocomposites; Sputtering; Density functional theory

Publication and Content Type

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