Abstract
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.
Highlights
Materials based on doped ceria have been investigated mainly for high temperature applications in solid oxide fuel cells and as sensor materials
In the last ten years, the scientific focus changed from the high temperature regime to application temperatures in the range of room temperature to 400 ◦ C, as ceria has become more and more important in the area of catalytic applications [1,2,3], and in the pharmaceutical area [4,5]
Manganese doping of ceria has until now been mainly investigated for catalytic applications [1,6] and as additive to improve the sinterability of ceria [7,8]
Summary
Materials based on doped ceria have been investigated mainly for high temperature applications in solid oxide fuel cells and as sensor materials. It has been found that manganese ions are able to diffuse into ceria when it is in contact to Mn containing materials at high temperatures, e.g., during the co-sintering of ceria-perovskite composites for solid oxide fuel cell components. This caused a certain interest in the effect of Mn doping [7]. The solubility limit of Mn in pure ceria has been found to be in the range between 5–10 mol % [7,8,12], or
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