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

Fingerprint

cobalt oxides
Cobalt
conduction
Oxides
halites
Seebeck coefficient
Seebeck effect
Electron diffraction
periodic variations
crossovers
electron diffraction
Activation energy
Salts
Rocks
activation energy
X ray diffraction
Temperature
electrical resistivity
coefficients
diffraction

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

Cite this

Shizuya, M., Isobe, M., Baba, Y., Nagai, T., Osada, M., Kosuda, K., ... 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

New misfit-layered cobalt oxide (CaOH)1.14CoO2 . / Shizuya, Mitsuyuki; Isobe, Masaaki; Baba, Yuji; Nagai, Takuro; Osada, Minoru; Kosuda, Kosuke; Takenouchi, Satoshi; Matsui, Yoshio; Takayama-Muromachi, Eiji.

In: Journal of Solid State Chemistry, Vol. 180, No. 1, 01.2007, p. 249-259.

Research output: Contribution to journalArticle

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, vol. 180, no. 1, pp. 249-259. https://doi.org/10.1016/j.jssc.2006.10.014
Shizuya M, Isobe M, Baba Y, Nagai T, Osada M, Kosuda K et al. New misfit-layered cobalt oxide (CaOH)1.14CoO2 Journal of Solid State Chemistry. 2007 Jan;180(1):249-259. https://doi.org/10.1016/j.jssc.2006.10.014
Shizuya, Mitsuyuki ; Isobe, Masaaki ; Baba, Yuji ; Nagai, Takuro ; Osada, Minoru ; Kosuda, Kosuke ; Takenouchi, Satoshi ; Matsui, Yoshio ; Takayama-Muromachi, Eiji. / New misfit-layered cobalt oxide (CaOH)1.14CoO2 In: Journal of Solid State Chemistry. 2007 ; Vol. 180, No. 1. pp. 249-259.
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AB - 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.

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