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Effect of Mn valence on crystal structure of La–Mn–O perovskite oxides

Published online by Cambridge University Press:  03 March 2011

Takeshi Yao ,
Toyoji Ito  and
Tadashi Kokubo
Takeshi Yao
Affiliation:
Graduate School of Engineering, Kyoto University, Yoshida-Honmach, Sakyo-ku, Kyoto-shi, Kyoto 606, Japan
Toyoji Ito
Affiliation:
Graduate School of Engineering, Kyoto University, Yoshida-Honmach, Sakyo-ku, Kyoto-shi, Kyoto 606, Japan
Tadashi Kokubo
Affiliation:
Graduate School of Engineering, Kyoto University, Yoshida-Honmach, Sakyo-ku, Kyoto-shi, Kyoto 606, Japan
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Abstract

La:Mn = 1:1 mixtures of lanthanum oxide and manganese carbonate were heat-treated under various oxygen partial pressures at 1400 °C or 1300 °C. The Mn valence of the samples was measured by a chemical analysis, and the crystal structures were refined by the powder x-ray diffraction and the Rietveld analysis. A novel orthorhombic perovskite phase, belonging to the space group Pbnm and containing - Mn2+ ions, was formed by heat-treatment under low oxygen partial pressures. The structure was very close to a cubic symmetry. It is supposed that the micro Jahn-Teller effects of Mn2+ ions were nearly canceled by one another.

Type
Communication
Information
Journal of Materials Research , Volume 10 , Issue 5 , May 1995 , pp. 1079 - 1082
Copyright
Copyright © Materials Research Society 1995

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References

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