New misfit-layered cobalt oxide (CaOH)1.14CoO2

Mitsuyuki Shizuya, Masaaki Isobe, Yuji Baba, Takuro Nagai, Minoru Osada, Kosuke Kosuda, Satoshi Takenouchi, Yoshio Matsui, Eiji Takayama-Muromachi

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We synthesized a new cobalt oxide (CaOH)1.14CoO2 by utilizing a high-pressure technique. X-ray and electron diffraction studies revealed that the compound has a layered structure that consists of CdI2-type CoO2 layers and rock-salt-type double CaOH atomic layers. The two subcells have incommensurate periodicity along the a-axis, resulting in a misfit-layered structure. From resistivity and Seebeck coefficient measurements, we have shown that the two-dimensional (2-D) variable-range hopping (VRH) regime with hole conduction is dominant at low temperature for this compound. As temperature increases, the conduction mechanism undergoes crossover from the 2-D VRH regime to a thermal activation-energy-type regime.

Original languageEnglish
Pages (from-to)249-259
Number of pages11
JournalJournal of Solid State Chemistry
Volume180
Issue number1
DOIs
Publication statusPublished - 2007 Jan
Externally publishedYes

Keywords

  • Electron microscopy
  • Layered cobalt oxide
  • New-material design
  • Seebeck coefficient
  • Thermoelectric oxide
  • Variable-range hopping

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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  • Cite this

    Shizuya, M., Isobe, M., Baba, Y., Nagai, T., Osada, M., Kosuda, K., Takenouchi, S., Matsui, Y., & Takayama-Muromachi, E. (2007). New misfit-layered cobalt oxide (CaOH)1.14CoO2 Journal of Solid State Chemistry, 180(1), 249-259. https://doi.org/10.1016/j.jssc.2006.10.014