Influence of Ag on the properties of Ca0.9Yb0.1MnO3 sintered ceramics

Sotelo, A. (Universidad de Zaragoza) ; Torres, M.A. (Universidad de Zaragoza) ; Madre, M.A. (Universidad de Zaragoza) ; Diez, J.C. (Universidad de Zaragoza)

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)

Financiación: info:eu-repo/grantAgreement/ES/DGA/T54-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2017-82183-C3-1-R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Expresión Gráfica en Ing. (Dpto. Ingeniería Diseño Fabri.)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)