Thermoelectric properties of Ba3 Co2 O6 (CO3)0.7 containing one-dimensional CoO6 octahedral columns

Kouta Iwasaki, Teruhisa Yamamoto, Hisanori Yamane, Takashi Takeda, Shigeo Arai, Hidetoshi Miyazaki, Kazuyoshi Tatsumi, Masahito Yoshino, Tsuyoshi Ito, Yuji Arita, Shunsuke Muto, Takanori Nagasaki, Tsuneo Matsui

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10 Citations (Scopus)


The thermoelectric properties of Ba3 Co2 O 6 (CO3)0.7 have been investigated using prismatic single crystals elongated along the c axis. Ba3 Co 2 O6 (CO3)0.7 has a pseudo-one-dimensional structure similar to that of 2H perovskite-type BaCoO3 and contains CoO6 octahedral columns running parallel to the c axis. The prismatic crystals are grown by a flux method using a K2 CO3 - BaCl2 flux. The electrical conductivity (σ) along the columns (c axis) exhibits a metallic behavior (670-320 S cm-1 in the temperature range of 300-1100 K), whereas the temperature dependence of the electrical conductivity perpendicular to the c axis is semiconducting. The Seebeck coefficient (S) along the columns is positive and greater than 100 μV K-1 over the measured temperature range (116-128 μV K-1). Ba3 Co2 O6 (CO 3) 0.7 shows power factors (σ S2) of 5.5× 10-4 -9.0× 10-4 W m-1 K -2 above room temperature, relatively high values for an oxide material.

Original languageEnglish
Article number034905
JournalJournal of Applied Physics
Issue number3
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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