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Crystals 2018, 8(1), 40;

Effect of MnO2 Concentration on the Conductivity of Ce0.9Gd0.1MnxO2−δ

Institute for Inorganic and Analytical Chemistry, University of Münster, Corrensstr. 28/30, 48149 Münster, Germany
Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), 52425 Jülich, Germany
Helmholtz Institute Münster (HI MS), IEK-12, Forschungszentrum Jülich GmbH, Corrensstraße 46, 48149 Münster, Germany
Author to whom correspondence should be addressed.
Received: 15 November 2017 / Revised: 12 January 2018 / Accepted: 15 January 2018 / Published: 17 January 2018
(This article belongs to the Special Issue Ceramic Conductors)
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Samples with the composition Ce0.9Gd0.1MnxO2−δ with x = 0.01, 0.02, and 0.05 Mn-addition were prepared by mixed oxide route from Ce0.9Gd0.1O2−δ and MnO2 and sintered at 1300 °C. The electronic conductivity was measured using a modified Hebb-Wagner technique, the electrical conductivity was investigated by impedance spectroscopy, and oxygen permeation was measured for the sample with x = 0.05. An increase of the electronic partial conductivity with increasing Mn addition was observed, which can be attributed to an additional Mn 3d-related state between the top of the valence band and the bottom of the Ce 4f band. The grain boundary conductivity was found to be suppressed for low Mn contents, but enhanced for the sample with x = 0.05. View Full-Text
Keywords: ceria; Hebb-Wagner measurements; electronic conductivity ceria; Hebb-Wagner measurements; electronic conductivity

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Neuhaus, K.; Baumann, S.; Dolle, R.; Wiemhöfer, H.-D. Effect of MnO2 Concentration on the Conductivity of Ce0.9Gd0.1MnxO2−δ. Crystals 2018, 8, 40.

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