Jump to main content
Jump to site search

Issue 33, 2014
Previous Article Next Article

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

Author affiliations

Abstract

The thermoelectric properties of the Magnéli 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.

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 23 Mar 2014, accepted on 15 May 2014 and first published on 15 May 2014


Article type: Paper
DOI: 10.1039/C4TA01395F
Author version
available:
Download author version (PDF)
J. Mater. Chem. A, 2014,2, 13492-13497

  •   Request permissions

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

    G. Kieslich, U. Burkhardt, C. S. Birkel, I. Veremchuk, J. E. Douglas, M. W. Gaultois, I. Lieberwirth, R. Seshadri, G. D. Stucky, Y. Grin and W. Tremel, J. Mater. Chem. A, 2014, 2, 13492
    DOI: 10.1039/C4TA01395F

Search articles by author

Spotlight

Advertisements