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• W2042609529 abstract "Ceria-based solid solutions, especially Gd-doped CeO2, have widely been used as electrolytes for use in intermediate-temperature fuel cells. In this study, three groups of Ce1−xGdxO2−δ (0.05⩽x⩽0.3) ceramics, with SiO2 contents of 30, 200 and 3000 ppm, were prepared. This investigation was intended to demonstrate the effects of both gadolinia and silica contents on the ionic conductivities (especially the grain-boundary (GB) contribution). It was found that, with increasing SiO2 content, the composition of maximum total conductivity shifted to high x values. For example, the composition of maximum total conductivity for the 30 ppm SiO2 group was x=0.15. It shifted to x=0.2 and 0.25 as SiO2 level increased to 200 and 3000 ppm, respectively. Meanwhile, the values of the maximum total conductivity were reduced significantly with increasing SiO2 content. Although the three groups showed a similar variation trend in the GB conduction with increasing Gd content, the mechanisms governing this variation trend were different, depending on the SiO2 content and the Gd content. The composition having the maximum GB conductivity (or the minimum activation energy for the GB conduction) could be taken as a critical value (xC). Below this value (xC), the GB conductivity was dominated by space-charge layers or/and resistive siliceous films, which was dependent on the SiO2content; and above this value (xC), the GB conductivity was determined by the segregation of undissolved Gd2O3 at the grain boundaries, which was irrespective of SiO2 content." @default.
• W2042609529 created "2016-06-24" @default.
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• W2042609529 date "2004-06-01" @default.
• W2042609529 modified "2023-10-17" @default.
• W2042609529 title "Intermediate-temperature ionic conductivity of ceria-based solid solutions as a function of gadolinia and silica contents" @default.
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• W2042609529 doi "https://doi.org/10.1016/j.solidstatesciences.2004.03.013" @default.
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