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 |
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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 |
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