Thermoelectric properties of ZnO ceramics densified through spark plasma sintering

P. M. Radingoana, S. Guillemet-Fritsch, J. Noudem, P. A. Olubambi, G. Chevallier, C. Estournès

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Thermoelectric properties of pure ZnO ceramics were investigated in this study. ZnO powders were sintered using spark plasma sintering by varying temperature (600–900 °C) and atmosphere (air and vacuum), thereafter, the ceramics were annealed in air at 600 °C. Relative densities >98% were determined for all the samples with grain sizes of the same order of magnitude, hence, thermal conductivity of ~45 W/mK was determined at room temperature. As-sintered ceramics prepared from synthetic powder (CSP) had higher carrier concentration than ceramics prepared from commercial powder (CCP) by 2.3x1017 cm−3. Thus, resistivity and Seebeck Coefficient of 0.08 Ω cm and 475 μV/K were determined, respectively, at room temperature for CSP sintered at 900 °C. There was no significant change on the performance of the ZnO ceramics when the sintering atmosphere and temperature were altered. Annealing did not improve the thermoelectric properties of ZnO ceramics. Maximum ZT of 8x10−3 was obtained for CSP sintered at 900 °C.

Original languageEnglish
Pages (from-to)5229-5238
Number of pages10
JournalCeramics International
Issue number4
Publication statusPublished - Mar 2020


  • Ceramics
  • Nanoparticles
  • Spark plasma sintering
  • Thermoelectricity
  • ZnO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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