Enhanced thermoelectric properties of the n-type Magnéli phase WO2.90: Reduced thermal conductivity through microstructure engineering

Gregor Kieslich; Ulrich Burkhardt; Christina S. Birkel; Igor Veremchuk; Jason E. Douglas; Michael W. Gaultois; Ingo Lieberwirth; Ram Seshadri; Galen D. Stucky; Yuri Grin; Wolfgang Tremel

doi:10.1039/c4ta01395f

Enhanced thermoelectric properties of the n-type Magnéli phase WO_2.90: Reduced thermal conductivity through microstructure engineering

Gregor Kieslich, Ulrich Burkhardt, Christina S. Birkel, Igor Veremchuk, Jason E. Douglas, Michael W. Gaultois, Ingo Lieberwirth, Ram Seshadri, Galen D. Stucky, Yuri Grin, Wolfgang Tremel

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Abstract

The thermoelectric properties of the Magnéli phase WO_2.90 were investigated, with special attention to how the thermoelectric performance can be altered by changing its microstructure. Spark plasma sintering (SPS) allowed the direct preparation of large amounts of consolidated material. Adding Ta₂O₅ to the reaction mixture lead to the formation of solid solutions W_1-xTa_xO_2.90via a concurrent reaction between WO₃ and Ta₂O₅ during the SPS treatment. In addition, micron-sized inclusions containing tungsten surrounded by WO_x embedded in a WO_2.90 matrix were formed, which act as additional scattering centers. As a result, the thermal conductivity of the Ta-containing samples was reduced by ≈30% over the temperature range from 300 to 1100 K while the electronic properties remained unaffected, which in turn enhanced the thermoelectric performance and led to a relatively high zT value of 0.15 at 1100 K for n-type metal oxides. This journal is

Original language	English (US)
Pages (from-to)	13492-13497
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	2
Issue number	33
DOIs	https://doi.org/10.1039/c4ta01395f
State	Published - Sep 7 2014
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
Renewable Energy, Sustainability and the Environment
General Materials Science

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Kieslich, G., Burkhardt, U., Birkel, C. S., Veremchuk, I., Douglas, J. E., Gaultois, M. W., Lieberwirth, I., Seshadri, R., Stucky, G. D., Grin, Y., & Tremel, W. (2014). Enhanced thermoelectric properties of the n-type Magnéli phase WO_2.90: Reduced thermal conductivity through microstructure engineering. Journal of Materials Chemistry A, 2(33), 13492-13497. https://doi.org/10.1039/c4ta01395f

Kieslich, G, Burkhardt, U, Birkel, CS, Veremchuk, I, Douglas, JE, Gaultois, MW, Lieberwirth, I, Seshadri, R, Stucky, GD, Grin, Y & Tremel, W 2014, 'Enhanced thermoelectric properties of the n-type Magnéli phase WO_2.90: Reduced thermal conductivity through microstructure engineering', Journal of Materials Chemistry A, vol. 2, no. 33, pp. 13492-13497. https://doi.org/10.1039/c4ta01395f

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abstract = "The thermoelectric properties of the Magn{\'e}li phase WO2.90 were investigated, with special attention to how the thermoelectric performance can be altered by changing its microstructure. Spark plasma sintering (SPS) allowed the direct preparation of large amounts of consolidated material. Adding Ta2O5 to the reaction mixture lead to the formation of solid solutions W1-xTaxO2.90via a concurrent reaction between WO3 and Ta2O5 during the SPS treatment. In addition, micron-sized inclusions containing tungsten surrounded by WOx embedded in a WO2.90 matrix were formed, which act as additional scattering centers. As a result, the thermal conductivity of the Ta-containing samples was reduced by ≈30% over the temperature range from 300 to 1100 K while the electronic properties remained unaffected, which in turn enhanced the thermoelectric performance and led to a relatively high zT value of 0.15 at 1100 K for n-type metal oxides. This journal is",

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AU - Veremchuk, Igor

AU - Douglas, Jason E.

AU - Gaultois, Michael W.

AU - Lieberwirth, Ingo

AU - Seshadri, Ram

AU - Stucky, Galen D.

AU - Grin, Yuri

AU - Tremel, Wolfgang

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Enhanced thermoelectric properties of the n-type Magnéli phase WO_2.90: Reduced thermal conductivity through microstructure engineering

Abstract

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