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Change of thermal expansion coefficient and electrical conductivity of LaCo1–xMxO3 (M = Fe, Ni)

Published online by Cambridge University Press:  03 March 2011

H. Nagamoto ,
I. Mochida ,
K. Kagotani ,
H. Inoue  and
A. Negishi
H. Nagamoto*
Affiliation:
Department of Chemical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
I. Mochida
Affiliation:
Department of Chemical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
K. Kagotani
Affiliation:
Department of Chemical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
H. Inoue
Affiliation:
Department of Chemical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
A. Negishi
Affiliation:
Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba 305, Japan
*
a)Author to whom all correspondence should be addressed.
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Abstract

The thermal expansion coefficient of LaCo1−xFexO3 averaging between 25 and 1000 °C decreased linearly with the Fe content, x. The thermal expansion of LaCo1−xNixO3 decreased with increasing the Ni content, but those for x = 0.67 and 1.0 were almost identical at 1000 °C due to the transition of the crystal system of LaNiO3. The behavior of thermal expansion was interpreted in terms of the formation enthalpy of the perovskites and the bond length between a B-site cation and an oxide anion. LaCo0.67Ni0.33O3, which has the electrical conductivity of 4 × 102 S/cm, could be a good candidate for the air electrode material.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 12 , December 1993 , pp. 3158 - 3162
Copyright
Copyright © Materials Research Society 1993

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References

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