Enhancement in thermoelectric characteristics of the misfit-layered cobalt oxide, [(Bi,Pb)2Ba1.8Co0.2O 4±ω]0.5CoO2, through Pb-for-Bi substitution

K. Sakai, T. Motohashi, M. Karppinen, H. Yamauchi*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

Thermoelectric characteristics of a newly discovered commensurate (q=0.5) misfit-layered oxide, [Bi2Ba1.8Co0.2O 4±ω]qCoO2, have been significantly enhanced through partial Pb-for-Bi substitution: such substitution is found not only to reduce electrical resistivity and extend the temperature range for metallic conductivity, but also to raise the Seebeck coefficient. To obtain heavily Pb-substituted samples (up to 20-30% substitution level) requires careful control of both temperature and oxygen partial pressure during synthesis. Upon increasing Pb content, the lattice gets shrunken along the layer-piling (c-axis) direction, while the q value remains constant at 0.5.

Original languageEnglish
Pages (from-to)58-62
Number of pages5
JournalThin Solid Films
Volume486
Issue number1-2
DOIs
Publication statusPublished - 22 Aug 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • Cobalt oxide
  • Misfit-layered compound
  • Thermoelectric characteristics

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