Enhanced electrical and thermoelectric properties from textured Bi1.6Pb0.4Ba2Co2Oy/Ag composites

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

Resumen: Bi1.6Pb0.4Ba2Co2Oy/3 wt% Ag composites have been textured using the laser floating zone technique. Microstructural observations have shown the formation of relatively high amounts of secondary phases and cracks along the plate-like grains in the as-grown materials. In spite of these microstructural features, electrical properties have not been drastically decreased. Annealing of these as-grown rods has enhanced the grains connectivity, decreased the contents of the secondary phases, and healed the cracks, thereby increasing their electrical performances. It has been deduced that oxygen content in the thermoelectric phase has not been significantly modified through annealing, as demonstrated by the very similar Seebeck values at room temperature in the as-grown and annealed samples. As a consequence of the low electrical resistivity values in the annealed materials, they reached higher power factor values than the as-grown ones. The highest power factor at room temperature is in the range of those reported for single crystals, while at 650 °C, it is the highest reported in Bi–Ba–Co–O polycrystalline family so far.

Idioma: Inglés

DOI: 10.1007/s10853-016-0718-6

Año: 2017

Publicado en: JOURNAL OF MATERIALS SCIENCE 52, 9 (2017), 4833-4839 [18p]
ISSN: 0022-2461

Factor impacto JCR: 2.993 (2017)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 84 / 283 = 0.297 (2017) - Q2 - T1

Factor impacto SCIMAGO: 0.807 - Mechanical Engineering (Q1) - Mechanics of Materials (Q2) - Materials Science (miscellaneous) (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/T12
Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/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.)