Effects of Synthesis and Spark Plasma Sintering Conditions on the Thermoelectric Properties of Ca3Co4O9+δ

NingYu Wu, Tim Holgate, Ngo Van Nong, Nini Pryds, Søren Linderoth

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Ca3Co4O9+δ samples were synthesized by solid-state (SS) and sol–gel (SG) reactions, followed by spark plasma sintering under different processing conditions. The synthesis process was optimized and the resulting materials characterized with respect to their microstructure, bulk density, and thermoelectric transport properties. High power factors of about 400 μW/m·K2 and 465 μW/m·K2 (at 800°C) were measured for SS and SG samples, respectively. The improved thermoelectric performance of the SG sample is believed to originate from the smaller particle sizes and better grain alignment. The SG method is suggested to be a beneficial means of obtaining high-performance thermoelectric materials of Ca3Co4O9+δ type.
Original languageEnglish
JournalJournal of Electronic Materials
Volume42
Issue number7
Pages (from-to)2134-2142
ISSN0361-5235
DOIs
Publication statusPublished - 2013

Keywords

  • Thermoelectric
  • Spark plasma sintering
  • Ca3Co4O9+d
  • Solid-state reaction
  • Sol–gel reaction

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