Enhancement of mechanical and thermoelectric properties of Ca3Co4O9 by Ag addition

Kahraman, F. ; Madre, M. A. (Universidad de Zaragoza) ; Rasekh, S. ; Salvador, C. ; Bosque, P. ; Torres, M. A. (Universidad de Zaragoza) ; Diez, J. C. (Universidad de Zaragoza) ; Sotelo, A. (Universidad de Zaragoza)

Resumen: Ca3Co4O9+x wt.% Ag (x=0, 1, 3, 5, and 10) polycrystalline thermoelectric ceramics have been prepared by a sol-gel route via nitrates followed by high temperature treatment before sintering. Out-of-plane XRD data have shown that major phase is the Ca3Co4O9 one, accompanied by metallic Ag. SEM observations have agreed with the XRD data. Apparent density measurements have revealed that all samples possess densities ranging between 80% and 90% when Ag content is raised. Mechanical properties have shown a drastic increase of bending stress when Ag is added to the samples. Electrical resistivity decreases with the Ag content, compared with the pure ones, while Seebeck coefficient slightly decreases. Maximum power factor values around 0.43mW/K2m at 800°C have been achieved for the 10wt.% Ag samples which is much higher than the measured in the pure Ca3Co4O9 samples.

Idioma: Inglés

DOI: 10.1016/j.jeurceramsoc.2015.05.029

Año: 2015

Publicado en: Journal of the European Ceramic Society 35, 14 (2015), 3835-3841
ISSN: 0955-2219

Factor impacto JCR: 2.933 (2015)

Categ. JCR: MATERIALS SCIENCE, CERAMICS rank: 1 / 27 = 0.037 (2015) - Q1 - T1

Factor impacto SCIMAGO: 1.135 - Materials Chemistry (Q1) - Ceramics and Composites (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/T12
Financiación: info:eu-repo/grantAgreement/ES/DGA/T87
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2013-46505-C3-1-R

Tipo y forma: Article (PostPrint)

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