Influence of Ag on the Properties of Ca0.9Yb0.1MnO3 Sintered Ceramics

In this study, Ca0.9Yb0.1MnO3 + x wt.% Ag (with x = 0, 1, 3, 5, and 10) thermoelectric materials were prepared via the classical ceramic method. In spite of the very high sintering temperature (1300 °C), no significant Ag losses were observed following this process. Moreover, Ag addition enhanced ca...

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Published inMaterials Vol. 11; no. 12; p. 2503
Main Authors Sotelo, Andrés, Torres, Miguel, Madre, María, Diez, Juan
Format Journal Article
LanguageEnglish
Published MDPI 09.12.2018
MDPI AG
Subjects
manganese oxide
power factor
silver
sintering
thermoelectricity
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Summary:In this study, Ca0.9Yb0.1MnO3 + x wt.% Ag (with x = 0, 1, 3, 5, and 10) thermoelectric materials were prepared via the classical ceramic method. In spite of the very high sintering temperature (1300 °C), no significant Ag losses were observed following this process. Moreover, Ag addition enhanced cation mobility during sintering due to the formation of a liquid phase. Microstructurally, it was found that Ag decreases porosity; this was confirmed by density measurements. Ag was also found to promote the formation of a Ca2Mn2O5 secondary phase. Despite the presence of this secondary phase, samples with Ag displayed lower electrical resistivity than Ag-free ones, without a drastic decrease in the absolute Seebeck coefficient. The highest thermoelectric performances, which were determined by power factor, were obtained in 1 wt.% Ag samples. These maximum values are slightly higher than the best of those reported in the literature for sintered materials with similar compositions, with the additional advantage of their being obtained using a much shorter sintering procedure.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma11122503