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  Spark Plasma Sintering of Tungsten Oxides WOx (2.50 <= x <= 3): Phase Analysis and Thermoelectric Properties

Kaiser, F., Simon, P., Burkhardt, U., Kieback, B., Grin, Y., & Veremchuk, I. (2017). Spark Plasma Sintering of Tungsten Oxides WOx (2.50 <= x <= 3): Phase Analysis and Thermoelectric Properties. CRYSTALS, 7(9): 271, pp. 1-14. doi:10.3390/cryst7090271.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-16D4-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-D390-B
Genre: Journal Article

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 Creators:
Kaiser, Felix1, Author              
Simon, Paul2, Author              
Burkhardt, Ulrich3, Author              
Kieback, Bernd4, Author
Grin, Yuri5, Author              
Veremchuk, Igor6, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Paul Simon, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863418              
3Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
4External Organizations, ou_persistent22              
5Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              
6Igor Veremchuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863411              

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 Abstract: The solid-state reaction of WO3 with W was studied in order to clarify the phase formation in the binary system W-O around the composition WOx (2.50 <= x <= 3) during spark plasma sintering (SPS). A new phase "WO2.82" is observed in the range 2.72 x 2.90 which might have the composition W12O34. The influence of the composition on the thermoelectric properties was investigated for 2.72 <= x <= 3. The Seebeck coefficient, electrical conductivity and electronic thermal conductivity are continuously tunable with the oxygen-to-tungsten ratio. The phase formation mainly affects the lattice thermal conductivity kappa(lat) which is significantly reduced until 700 K for the sample with the composition x = 2.84, which contains the phases W18O49 and "WO2.82". In single-phase WO2.90 and multi-phase WOx materials (2.90 <= x <= 3), which contain crystallographic shear plane phases, a similar reduced kappa(lat) is observed only below 560 K and 550 K, respectively. Therefore, the composition range x < 2.90 in which the pentagonal column structural motif is formed might be more suitable for decreasing the lattice thermal conductivity at high temperatures.

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Language(s): eng - English
 Dates: 2017-09-052017-09-05
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: ISI: 000412049600015
DOI: 10.3390/cryst7090271
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Title: CRYSTALS
Source Genre: Journal
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Pages: - Volume / Issue: 7 (9) Sequence Number: 271 Start / End Page: 1 - 14 Identifier: ISSN: 2073-4352