Oxygen nonstoichiometry of various functional layered oxides

Jun ichi Shimoyama; Yuui Yokota; Masahiro Shiraki; Yuuki Sugiura; Shigeru Horii; Kohji Kishio

Oxygen nonstoichiometry of various functional layered oxides

Jun ichi Shimoyama, Yuui Yokota, Masahiro Shiraki, Yuuki Sugiura, Shigeru Horii, Kohji Kishio

IMR - Materials Design Division

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

The mixed metal oxides having layered crystal structure have been of much interest because of their various new and excellent functions. Precise phase diagrams on the oxygen content have not been clarified for most of these layered oxides, while oxygen nonstoichiometry often plays a crucial role for determining functions of oxide materials. In this paper, we report oxygen nonstoichiometry and related physical properties mainly on the manganese-based and cobalt-based layered oxides. In the La_2-2xSr _1+2xMn₂O_y (x = 0.3, 0.4), dramatic change in magnetization properties with oxygen content were observed in spite of its small oxygen nonstoichiometry. For (Ca₂CoO₃-δ) _0.62CoO₂ systems, high valence metal substitution was found to be effective for suppression of oxygen nonstoichiometry, increase of decomposition temperature and thermoelectric properties.

Original language	English
Article number	FF10.8
Pages (from-to)	523-527
Number of pages	5
Journal	Materials Research Society Symposium Proceedings
Volume	848
Publication status	Published - 2005
Event	2004 Materials Research Society Fall Meeting - Boston, MA, United States Duration: 2004 Nov 29 → 2004 Dec 2

Cite this

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title = "Oxygen nonstoichiometry of various functional layered oxides",

abstract = "The mixed metal oxides having layered crystal structure have been of much interest because of their various new and excellent functions. Precise phase diagrams on the oxygen content have not been clarified for most of these layered oxides, while oxygen nonstoichiometry often plays a crucial role for determining functions of oxide materials. In this paper, we report oxygen nonstoichiometry and related physical properties mainly on the manganese-based and cobalt-based layered oxides. In the La2-2xSr 1+2xMn2Oy (x = 0.3, 0.4), dramatic change in magnetization properties with oxygen content were observed in spite of its small oxygen nonstoichiometry. For (Ca2CoO3-δ) 0.62CoO2 systems, high valence metal substitution was found to be effective for suppression of oxygen nonstoichiometry, increase of decomposition temperature and thermoelectric properties.",

author = "Shimoyama, {Jun ichi} and Yuui Yokota and Masahiro Shiraki and Yuuki Sugiura and Shigeru Horii and Kohji Kishio",

year = "2005",

language = "English",

volume = "848",

pages = "523--527",

journal = "Materials Research Society Symposium Proceedings",

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note = "2004 Materials Research Society Fall Meeting ; Conference date: 29-11-2004 Through 02-12-2004",

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TY - JOUR

T1 - Oxygen nonstoichiometry of various functional layered oxides

AU - Shimoyama, Jun ichi

AU - Yokota, Yuui

AU - Shiraki, Masahiro

AU - Sugiura, Yuuki

AU - Horii, Shigeru

AU - Kishio, Kohji

PY - 2005

Y1 - 2005

N2 - The mixed metal oxides having layered crystal structure have been of much interest because of their various new and excellent functions. Precise phase diagrams on the oxygen content have not been clarified for most of these layered oxides, while oxygen nonstoichiometry often plays a crucial role for determining functions of oxide materials. In this paper, we report oxygen nonstoichiometry and related physical properties mainly on the manganese-based and cobalt-based layered oxides. In the La2-2xSr 1+2xMn2Oy (x = 0.3, 0.4), dramatic change in magnetization properties with oxygen content were observed in spite of its small oxygen nonstoichiometry. For (Ca2CoO3-δ) 0.62CoO2 systems, high valence metal substitution was found to be effective for suppression of oxygen nonstoichiometry, increase of decomposition temperature and thermoelectric properties.

AB - The mixed metal oxides having layered crystal structure have been of much interest because of their various new and excellent functions. Precise phase diagrams on the oxygen content have not been clarified for most of these layered oxides, while oxygen nonstoichiometry often plays a crucial role for determining functions of oxide materials. In this paper, we report oxygen nonstoichiometry and related physical properties mainly on the manganese-based and cobalt-based layered oxides. In the La2-2xSr 1+2xMn2Oy (x = 0.3, 0.4), dramatic change in magnetization properties with oxygen content were observed in spite of its small oxygen nonstoichiometry. For (Ca2CoO3-δ) 0.62CoO2 systems, high valence metal substitution was found to be effective for suppression of oxygen nonstoichiometry, increase of decomposition temperature and thermoelectric properties.

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M3 - Conference article

AN - SCOPUS:28844499928

SN - 0272-9172

VL - 848

SP - 523

EP - 527

JO - Materials Research Society Symposium Proceedings

JF - Materials Research Society Symposium Proceedings

M1 - FF10.8

T2 - 2004 Materials Research Society Fall Meeting

Y2 - 29 November 2004 through 2 December 2004

ER -

Oxygen nonstoichiometry of various functional layered oxides

Abstract

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