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  Fine tuning of thermoelectric performance in phase-separated half-Heusler compounds

Rausch, E., Balke, B., Stahlhofen, J. M., Ouardi, S., Burkhardt, U., & Felser, C. (2015). Fine tuning of thermoelectric performance in phase-separated half-Heusler compounds. Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, 3(40), 10409-10414. doi:10.1039/C5TC01196E.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-C19D-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1780-4
Genre: Journal Article

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 Creators:
Rausch, Elisabeth1, Author              
Balke, Benjamin2, Author
Stahlhofen, Jana Marie2, Author
Ouardi, Siham3, Author              
Burkhardt, Ulrich4, Author              
Felser, Claudia5, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863439              
4Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Two successful recipes to enhance the thermoelectric performance,} namely carrier concentration optimization and reduction of thermal conductivity{,} have been combined and applied to the p-type (Ti/Zr/Hf)CoSb1-xSnx system. An intrinsic micrometer-scale phase separation increases the phonon scattering and reduces the lattice thermal conductivity. A substitution of 15 Sb by Sn optimizes the electronic properties. Starting from this{,} further improvement of the thermoelectric properties has been achieved by a fine tuning of the Ti to Hf ratio. The microstructuring of the samples was studied in detail with high-resolution synchrotron powder X-ray diffraction and element mapping electron microscopy. Linking the structural with the thermoelectric properties{,} a record thermoelectric figure of merit for p-type half-Heusler compounds of ZT [approximate] 1.2 at 710 [degree]C in Ti0.25Hf0.75CoSb0.85Sn0.15 was achieved. The phase separation approach can form a significant alternative to nanostructuring processing{,} saving time{, energy consumption and increasing the thermoelectric efficiency.

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Language(s): eng - English
 Dates: 2015-06-23
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1039/C5TC01196E
 Degree: -

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Title: Journal of Materials Chemistry C: Materials for Optical and Electronic Devices
  Other : J. Mater. Chem. C
Source Genre: Journal
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Publ. Info: London, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 3 (40) Sequence Number: - Start / End Page: 10409 - 10414 Identifier: ISSN: 2050-7526
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7526