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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


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
Issue number1
Publication statusPublished - 2007 Jan
Externally publishedYes


  • 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


Dive into the research topics of 'New misfit-layered cobalt oxide (CaOH)1.14CoO2'. Together they form a unique fingerprint.

Cite this