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Monoclinic phase of the misfit-layered cobalt oxide (Ca0.85OH)1.16CoO2

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Title: Monoclinic phase of the misfit-layered cobalt oxide (Ca0.85OH)1.16CoO2
Authors: Shizuya, Mitsuyuki1, Isobe, Masaaki ISOBE.Masaaki@nims.go.jp, Baba, Yuji1, Nagai, Takuro1, Matsui, Yoshio1, Takayama-Muromachi, Eiji1
Source: Journal of Solid State Chemistry. Dec2006, Vol. 179 Issue 12, p3974-3980. 7p.
Subjects: Transition metals, Electron microscopy, Electron diffraction, Analytical chemistry
Abstract: Abstract: A monoclinic phase of the misfit-layered cobalt oxide (Ca0.85OH)1.16CoO2 was successfully synthesized and characterized. It was found that this new material is a poly-type phase of the orthorhombic form of (CaOH)1.14CoO2, recently discovered by the present authors. Both the compounds consist of two interpenetrating subsystems: CdI2-type CoO2 layers and rock-salt-type double-atomic-layer CaOH blocks. However, these two phases exhibit a different stacking structure. By powder X-ray and electron diffraction (ED) studies, it was found that the two subsystems of (Ca0.85OH)1.16CoO2 have c-centered monoclinic Bravais lattices with common a=4.898Å, c=8.810Å and β=95.8° lattice parameters, and different b parameters: b 1=2.820Å and b 2=4.870Å. Chemical analyses revealed that the monoclinic phase has a cobalt valence of +3.1–3.2. Resistivity of the monoclinic phase is approximately 101–105 times lower than that of the orthorhombic phase. This suggests that the monoclinic phase is a hole-doped phase of the insulating orthorhombic phase. Furthermore, large positive Seebeck coefficients (∼100μV/K) were observed near room temperature. [Copyright &y& Elsevier]
Copyright of Journal of Solid State Chemistry is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 23304829
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  Data: Monoclinic phase of the misfit-layered cobalt oxide (Ca0.85OH)1.16CoO2
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  Data: <searchLink fieldCode="AR" term="%22Shizuya%2C+Mitsuyuki%22">Shizuya, Mitsuyuki</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Isobe%2C+Masaaki%22">Isobe, Masaaki</searchLink><i> ISOBE.Masaaki@nims.go.jp</i><br /><searchLink fieldCode="AR" term="%22Baba%2C+Yuji%22">Baba, Yuji</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Nagai%2C+Takuro%22">Nagai, Takuro</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Matsui%2C+Yoshio%22">Matsui, Yoshio</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Takayama-Muromachi%2C+Eiji%22">Takayama-Muromachi, Eiji</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Solid+State+Chemistry%22">Journal of Solid State Chemistry</searchLink>. Dec2006, Vol. 179 Issue 12, p3974-3980. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Transition+metals%22">Transition metals</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+microscopy%22">Electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+diffraction%22">Electron diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+chemistry%22">Analytical chemistry</searchLink>
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  Label: Abstract
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  Data: Abstract: A monoclinic phase of the misfit-layered cobalt oxide (Ca0.85OH)1.16CoO2 was successfully synthesized and characterized. It was found that this new material is a poly-type phase of the orthorhombic form of (CaOH)1.14CoO2, recently discovered by the present authors. Both the compounds consist of two interpenetrating subsystems: CdI2-type CoO2 layers and rock-salt-type double-atomic-layer CaOH blocks. However, these two phases exhibit a different stacking structure. By powder X-ray and electron diffraction (ED) studies, it was found that the two subsystems of (Ca0.85OH)1.16CoO2 have c-centered monoclinic Bravais lattices with common a=4.898Å, c=8.810Å and β=95.8° lattice parameters, and different b parameters: b 1=2.820Å and b 2=4.870Å. Chemical analyses revealed that the monoclinic phase has a cobalt valence of +3.1–3.2. Resistivity of the monoclinic phase is approximately 101–105 times lower than that of the orthorhombic phase. This suggests that the monoclinic phase is a hole-doped phase of the insulating orthorhombic phase. Furthermore, large positive Seebeck coefficients (∼100μV/K) were observed near room temperature. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Solid State Chemistry is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.jssc.2006.09.008
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        Text: English
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              M: 12
              Text: Dec2006
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