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Oxygen Nonstoichiometry of Various Functional Layered Oxides

Published online by Cambridge University Press:  01 February 2011

Jun-ichi Shimoyama ,
Yuui Yokota ,
Masahiro Shiraki ,
Yuuki Sugiura ,
Shigeru Horii  and
Kohji Kishio
Jun-ichi Shimoyama
Affiliation:
Department of Applied Chemistry, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo, 113–8656, Japan PRESTO, Japan Science and Technology Corporation (JST), 4–1–8 Honcho, Kawaguchi, Saitama 332–0012, Japan
Yuui Yokota
Affiliation:
Department of Applied Chemistry, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo, 113–8656, Japan
Masahiro Shiraki
Affiliation:
Department of Applied Chemistry, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo, 113–8656, Japan
Yuuki Sugiura
Affiliation:
Department of Applied Chemistry, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo, 113–8656, Japan
Shigeru Horii
Affiliation:
Department of Applied Chemistry, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo, 113–8656, Japan
Kohji Kishio
Affiliation:
Department of Applied Chemistry, University of Tokyo, 7–3–1 Hongo, Bunkyo-ku, Tokyo, 113–8656, Japan
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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 La2–2xSr1+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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF10.8
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

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