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Electrical Conductivity of Zirconia-Mn Oxide Mixture

Published online by Cambridge University Press:  15 February 2011

J. H. Kim  and
G. M. Choi
J. H. Kim
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea
G. M. Choi
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea
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Abstract

Mn2O3 was added to YSZ (8 mol% yttria- doped zirconia) either to form solid solution or two-phase (Mn2O3 and Mn2O3 doped-YSZ) mixed-conducting oxide. The electrical conductivity was measured between 600 and 1000°C in air using 4-probe d.c. method in a wide composition range to determine composition-dependent conductivity. Up to 12 mol% MnO1.5 addition, the conductivity decreases and the activation energy increases. With further increase of MnO1.5 content, the conductivity of composite begins to increase slowly and then increases rapidly after 30 mol% due to the interconnected, conductive Mn2O3 particles. Above 35 Mol% MnO1.5 content, the activation energy is nearly the same as that of Mn2O3. Hysteresis behavior shown in the conductivity of composite also provides the evidence of percolation by MnO1.5.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 611
Copyright
Copyright © Materials Research Society 1999

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