Improved thermoelectric properties in directionally grown Bi2Sr2Co1.8Oy ceramics by Pb for Bi substitution

Sotelo, A. (Universidad de Zaragoza) ; Rasekh, Sh. ; Guilmeau, E. ; Madre, M. A. (Universidad de Zaragoza) ; Torres, M. A. (Universidad de Zaragoza) ; Marinel, S. ; Diez, J. C. (Universidad de Zaragoza)

Resumen: Thermoelectric performances of misfit cobaltites can be controlled by grain orientation and/or by cation substitution. Both processes have been simultaneously performed by directional solidification at 0.03 m/h, using the laser floating zone technique, of Bi2-xPbxSr 2Co1.8Oy (with x = 0.0, 0.2, 0.4 and 0.6). The microstructure has shown two different main phases as a function of Pb content, a Co-poor phase for low Pb content (0.0 and 0.2) and a Co-rich one for higher Pb substitution. These microstructural changes are reflected on the thermoelectric properties leading to an important decrease on the resistivity and increase of thermopower for samples with 0.4Pb substitution. Both improvements lead to power factor values higher than usual in textured misfit cobaltites.

Idioma: Inglés

DOI: 10.1016/j.materresbull.2011.08.011

Año: 2011

Publicado en: Materials Research Bulletin 46 (2011), 2537-2542
ISSN: 0025-5408

Factor impacto JCR: 2.105 (2011)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 55 / 229 = 0.24 (2011) - Q1 - T1

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.)