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

doi:10.1016/j.jssc.2006.10.014

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 journal › Article

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 language	English
Pages (from-to)	249-259
Number of pages	11
Journal	Journal of Solid State Chemistry
Volume	180
Issue number	1
DOIs	https://doi.org/10.1016/j.jssc.2006.10.014
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

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

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title = "New misfit-layered cobalt oxide (CaOH)1.14CoO2 ",

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.",

keywords = "Electron microscopy, Layered cobalt oxide, New-material design, Seebeck coefficient, Thermoelectric oxide, Variable-range hopping",

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

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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

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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

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10.1016/j.jssc.2006.10.014