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  4. Does a Low Amount of Substituents Improve the Thermoelectric Properties of Cr2-xMxS3 (M = Ti, V, Sn)?
 
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2022
Journal Article
Titel

Does a Low Amount of Substituents Improve the Thermoelectric Properties of Cr2-xMxS3 (M = Ti, V, Sn)?

Abstract
The effects of low-level partial cation substitution in Cr2-xMxS3 with M = Ti, V or Sn and x = 0.05 and 0.1 have been investigated regarding the long- and short-range crystal structures and thermoelectric properties. All substituted compounds crystallized in the equilibrium phase of Cr2S3, adopting the space group R3¯¯¯. Electron beam irradiation led to a phase transformation from space group R3¯¯¯ to P3¯¯¯1c with a subsequent appearance of diffuse scattering, indicating short-range ordering of cations in the partially occupied cation layers. Substitution of Cr by V led to a reduction in electrical conductivity and subsequently to a lower thermoelectric performance in comparison to the pristine material. In contrast, substitution with Ti yielded an improvement of the performance due to a higher electrical conductivity and a reasonably high Seebeck coefficient. Both Sn-substituted compounds contained only traces of Sn. Surprisingly, a significant improvement of the electrical conductivities could be observed in comparison to the pristine material as well as the other Cr2-xMxS3 materials.
Author(s)
Groß, Hendrik
Ekici, Yeliz
Poschmann, Michael
Groeneveld, Dennis
Univ. Freiburg/Brsg., Institut für Mikrosystemtechnik -IMTEK-
Dankwort, Torben
Fraunhofer-Institut für Siliziumtechnologie ISIT
König, Jan
Fraunhofer-Institut für Physikalische Messtechnik IPM
Bensch, Wolfgang
Kienle, Lorenz
Zeitschrift
Journal of Electronic Materials
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DOI
10.1007/s11664-022-09606-7
Language
English
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Fraunhofer-Institut für Physikalische Messtechnik IPM
Fraunhofer-Institut für Siliziumtechnologie ISIT
Tags
  • Thermoelectricity

  • Chromium sulfides

  • Low-level substitutio...

  • Nanostructuring

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