Influence of Cobalt Doping on the Thermoelectric Properties of the Magnéli Phase W_<18>O_<49>

DOI IR (HANDLE) Open Access
  • Mostafa M. ELKADY
    Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • OHTAKI Michitaka
    Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University Transdisciplinary Research and Education Center for Green Technologies, Kyushu University
  • SUEKUNI Koichiro
    Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University Transdisciplinary Research and Education Center for Green Technologies, Kyushu University

Description

The Magnéli phase W18O49 exhibits promising thermoelectric properties owing to its high electrical conductivity and low thermal conductivity, despite its low Seebeck coefficient. In this study, (W1-xCox)18O49 (0 ≤ x ≤ 0.05) was synthesized via a solid-state reaction, followed by spark plasma sintering, to investigate the effect of cobalt dopants on the thermoelectric properties of W18O49. The XRD analysis indicated the formation of W18O49-based phase and the secondary phase CoWO4. The cobalt substitution decreased both the electrical and thermal conductivities while slightly increased the Seebeck coefficient. These reduction in the thermal conductivity led to enhanced thermoelectric performance. The dimensionless figure of merit (ZT) reached to 0.022 at 1073 K for x = 0.05.

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Keywords

Details 詳細情報について

  • CRID
    1390020840082027776
  • DOI
    10.5109/7323399
  • HANDLE
    2324/7323399
  • ISSN
    24341436
  • Text Lang
    en
  • Article Type
    conference paper
  • Data Source
    • JaLC
    • IRDB
    • Crossref
  • Abstract License Flag
    Allowed

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