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  Indium thiospinel In1-xxIn2S4-structural characterization and thermoelectric properties

Wyżga, P., Veremchuk, I., Himcinschi, C., Burkhardt, U., Carrillo-Cabrera, W., Bobnar, M., et al. (2019). Indium thiospinel In1-xxIn2S4-structural characterization and thermoelectric properties. Dalton Transactions, 48(23), 8350-8360. doi:10.1039/c9dt00890j.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-D862-B Version Permalink: http://hdl.handle.net/21.11116/0000-0003-E498-0
Genre: Journal Article

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 Creators:
Wyżga, Paweł1, Author              
Veremchuk, Igor2, Author              
Himcinschi, Cameliu3, Author
Burkhardt, Ulrich4, Author              
Carrillo-Cabrera, Wilder1, Author              
Bobnar, Matej1, Author              
Hennig, Christoph3, Author
Leithe-Jasper, Andreas5, Author              
Kortus, Jens3, Author
Gumeniuk, Roman3, Author
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              
3External Organizations, ou_persistent22              
4Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
5Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              

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 Abstract: A detailed study of polycrystalline indium-based In1-x□xIn2S4 (x = 0.16, 0.22, 0.28, and 0.33) thiospinel is presented (□-vacancy). Comprehensive investigation of synthesis conditions, phase composition and thermoelectric properties was performed by means of various diffraction, microscopic and spectroscopic methods. Single-phase α- and β-In1-x□xIn2S4 were found in samples with 0.16 ≤ x ≤ 0.22 and x = 0.33 (In2S3), respectively. In contrast, it is shown that In0.72□0.28In2S4 contains both α- and β-polymorphic modifications. Consequently, the thermoelectric characterization of well-defined α- and β-In1-x□xIn2S4 is conducted for the first time. α-In1-x□xIn2S4 (x = 0.16 and 0.22) revealed n-type semiconducting behavior, a large Seebeck coefficient (gt;200μV K-1) and moderate charge carrier mobility on the level of ∼20 cm2 V-1 s-1 at room temperature (RT). Decreases in charge carrier concentration (increase of electrical resistivity) and thermal conductivity (even below 0.6 W m-1 K-1 at 760 K) for larger In-content are observed. Although β-In0.67□0.33In2S4 (β-In2S3) is a distinct polymorphic modification, it followed the abovementioned trend in thermal conductivity and displayed significantly higher charge carrier mobility (∼104 cm2 V-1 s-1 at RT). These findings indicate that structural disorder in the α-modification affects both electronic and thermal properties in this thiospinel. The reduction of thermal conductivity counterbalances a lowered power factor and, thus, the thermoelectric figure of merit ZTmax = 0.2 at 760 K is nearly the same for both α- and β-In1-x□xIn2S4. © 2019 The Royal Society of Chemistry.

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Language(s): eng - English
 Dates: 2019-06-202019-06-20
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1039/c9dt00890j
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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 (23) Sequence Number: - Start / End Page: 8350 - 8360 Identifier: ISSN: 1477-9226
CoNE: https://pure.mpg.de/cone/journals/resource/954925269323