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 › peer-review

32 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

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

Access to Document

10.1016/j.jssc.2006.10.014

Cite this

@article{0237c3eb6e2448d88d13f291ca450550,

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",

year = "2007",

month = jan,

doi = "10.1016/j.jssc.2006.10.014",

language = "English",

volume = "180",

pages = "249--259",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

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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

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JF - Journal of Solid State Chemistry

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