Resumen: 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. Idioma: Inglés DOI: 10.3390/ma11122503 Año: 2018 Publicado en: Materials 11, 12 (2018), 2503 [10 pp] ISSN: 1996-1944 Factor impacto JCR: 2.972 (2018) Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 102 / 293 = 0.348 (2018) - Q2 - T2 Factor impacto SCIMAGO: 0.686 - Materials Science (miscellaneous) (Q2)