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Title: New misfit-layered cobalt oxide (CaOH){sub 1.14}CoO{sub 2}

Abstract

We synthesized a new cobalt oxide (CaOH){sub 1.14}CoO{sub 2} by utilizing a high-pressure technique. X-ray and electron diffraction studies revealed that the compound has a layered structure that consists of CdI{sub 2}-type CoO{sub 2} 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. - Graphical abstract: Crystal-structure model of the misfit-layered cobalt oxide (CaOH){sub 1.14}CoO{sub 2}. The rectangles indicate unit cells of the two subsystems. The open circles and squares represent the cobalt atoms situated at different positions along the projected coordinate.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
  2. National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan), E-mail: ISOBE.Masaaki@nims.go.jp
Publication Date:
OSTI Identifier:
21015644
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 1; Other Information: DOI: 10.1016/j.jssc.2006.10.014; PII: S0022-4596(06)00556-1; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACTIVATION ENERGY; COBALT OXIDES; CRYSTAL STRUCTURE; ELECTRON DIFFRACTION; ELECTRON MICROSCOPY; LAYERS; X RADIATION

Citation Formats

Shizuya, Mitsuyuki, Isobe, Masaaki, Baba, Yuji, Nagai, Takuro, Osada, Minoru, Kosuda, Kosuke, Takenouchi, Satoshi, Matsui, Yoshio, and Takayama-Muromachi, Eiji. New misfit-layered cobalt oxide (CaOH){sub 1.14}CoO{sub 2}. United States: N. p., 2007. Web. doi: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){sub 1.14}CoO{sub 2}. United States. doi:10.1016/j.jssc.2006.10.014.
Shizuya, Mitsuyuki, Isobe, Masaaki, Baba, Yuji, Nagai, Takuro, Osada, Minoru, Kosuda, Kosuke, Takenouchi, Satoshi, Matsui, Yoshio, and Takayama-Muromachi, Eiji. Mon . "New misfit-layered cobalt oxide (CaOH){sub 1.14}CoO{sub 2}". United States. doi:10.1016/j.jssc.2006.10.014.
@article{osti_21015644,
title = {New misfit-layered cobalt oxide (CaOH){sub 1.14}CoO{sub 2}},
author = {Shizuya, Mitsuyuki and Isobe, Masaaki and Baba, Yuji and Nagai, Takuro and Osada, Minoru and Kosuda, Kosuke and Takenouchi, Satoshi and Matsui, Yoshio and Takayama-Muromachi, Eiji},
abstractNote = {We synthesized a new cobalt oxide (CaOH){sub 1.14}CoO{sub 2} by utilizing a high-pressure technique. X-ray and electron diffraction studies revealed that the compound has a layered structure that consists of CdI{sub 2}-type CoO{sub 2} 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. - Graphical abstract: Crystal-structure model of the misfit-layered cobalt oxide (CaOH){sub 1.14}CoO{sub 2}. The rectangles indicate unit cells of the two subsystems. The open circles and squares represent the cobalt atoms situated at different positions along the projected coordinate.},
doi = {10.1016/j.jssc.2006.10.014},
journal = {Journal of Solid State Chemistry},
number = 1,
volume = 180,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}