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 language | English |
|---|---|
| Pages (from-to) | 249-259 |
| Number of pages | 11 |
| Journal | Journal of Solid State Chemistry |
| Volume | 180 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2007 Jan |
| Externally published | Yes |
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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
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 journal › Article
}
TY - JOUR
T1 - New misfit-layered cobalt oxide (CaOH)1.14CoO2
AU - Shizuya, Mitsuyuki
AU - Isobe, Masaaki
AU - Baba, Yuji
AU - Nagai, Takuro
AU - Osada, Minoru
AU - Kosuda, Kosuke
AU - Takenouchi, Satoshi
AU - Matsui, Yoshio
AU - Takayama-Muromachi, Eiji
PY - 2007/1
Y1 - 2007/1
N2 - 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.
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.
KW - Electron microscopy
KW - Layered cobalt oxide
KW - New-material design
KW - Seebeck coefficient
KW - Thermoelectric oxide
KW - Variable-range hopping
UR - http://www.scopus.com/inward/record.url?scp=33846229289&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33846229289&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2006.10.014
DO - 10.1016/j.jssc.2006.10.014
M3 - Article
AN - SCOPUS:33846229289
VL - 180
SP - 249
EP - 259
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 1
ER -