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  Structural stability and thermoelectric performance of high quality synthetic and natural pyrites (FeS2)

Zuñiga-Puelles, E., Cardoso-Gil, R., Bobnar, M., Veremchuk, I., Himcinschi, C., Hennig, C., et al. (2019). Structural stability and thermoelectric performance of high quality synthetic and natural pyrites (FeS2). Dalton Transactions, 48(28), 10703-10713. doi:10.1039/c9dt01902b.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-7840-D Version Permalink: http://hdl.handle.net/21.11116/0000-0004-7862-7
Genre: Journal Article

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 Creators:
Zuñiga-Puelles, E.1, Author              
Cardoso-Gil, R.2, Author              
Bobnar, M.1, Author              
Veremchuk, I.3, Author              
Himcinschi, C.4, Author
Hennig, C.4, Author
Kortus, J.4, Author
Heidee, G.4, Author
Gumeniuk, R.4, Author
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Raul Cardoso, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863420              
3Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              
4External Organizations, ou_persistent22              

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 Abstract: Synthetic bulk and natural pyrite from the hydrothermal mine in Schonbrunn (Saxony, Germany) are confirmed to be stoichiometric FeS2 compounds and stable (for thermoelectric applications) up to similar to 600 K by combined thermal, chemical, spectroscopic and X-ray diffraction analyses. Natural pyrite with a small amount (<0.6 wt%) of well-defined transition metal carbonates revealed characteristics of a nondegenerate semiconductor and is suitable as a model system for the investigation of thermoelectric performance. In the temperature range 50-600 K both natural and synthetic high quality bulk FeS2 samples show electrical resistivity and Seebeck coefficients varying within 220-5 x 10(-3) omega m and 4 - (-450) mu V K-1, respectively. The large thermal conductivity (similar to 40 W m(-1) K-1 at 300 K) is exclusively due to phononic contribution, showing a well pronounced maximum centered at similar to 75 K for natural pyrite (grain size <= 5 mm). It becomes almost completely suppressed in the sintered bulk samples due to the increase of point defect concentration and additional scattering on the grain boundaries (grain size <= 100 mu m). The thermoelectric performance of pure pyrite with ZT similar to 10(-6) at 600 K is indeed by a factor of similar to 1000 worse than those reported earlier for some minerals and synthetic samples.

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Language(s): eng - English
 Dates: 2019-07-282019-07-28
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000476573300034
DOI: 10.1039/c9dt01902b
 Degree: -

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Title: Dalton Transactions
  Abbreviation : Dalton Trans.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 48 (28) Sequence Number: - Start / End Page: 10703 - 10713 Identifier: ISSN: 1477-9226
CoNE: https://pure.mpg.de/cone/journals/resource/954925269323