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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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
Volume106
Issue number3
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Thermoelectric properties of Ba<sub>3</sub> Co<sub>2</sub> O<sub>6</sub> (CO<sub>3</sub>)<sub>0.7</sub> containing one-dimensional CoO<sub>6</sub> octahedral columns'. Together they form a unique fingerprint.

Cite this