Long-term high-temperature stability of directionally grown [Bi2Ba2O4]p[CoO2] rods

Diez, J.C. (Universidad de Zaragoza) ; Madre, M.A. (Universidad de Zaragoza) ; Torres, M.A. (Universidad de Zaragoza) ; Rasekh, S. ; Sotelo, A. (Universidad de Zaragoza)
Long-term high-temperature stability of directionally grown [Bi2Ba2O4]p[CoO2] rods
Resumen: [Bi2Ba2O4]p[CoO2] thermoelectric ceramics have been successfully grown from the melt using the laser floating zone method, followed by a thermal treatment at 700°C under air between 0 and 1532 h. The microstructural, thermoelectric, and mechanical properties were evaluated as a function of the thermal treatment length. Microstructure has shown that as-grown samples are composed of thermoelectric grains, together with a relatively high amount of secondary phases. Thermal treatment decreased the number and amount of secondary phases, producing nearly single-phase samples after 384 h. Consequently, the thermoelectric properties evaluated through the power factor showed a slight increase with the thermal treatment length, mainly due to the decrease of electrical resistivity, while the Seebeck coefficient was nearly unchanged. On the other hand, flexural strength was practically constant after 24 h thermal treatment.
Idioma: Inglés
DOI: 10.3390/ma10020146
Año: 2017
Publicado en: MATERIALS 10, 2 (2017), 146 [10 pp]
ISSN: 1996-1944

Factor impacto JCR: 2.467 (2017)
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 111 / 285 = 0.389 (2017) - Q2 - T2
Factor impacto SCIMAGO: 0.732 - Materials Science (miscellaneous) (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA/T12
Financiación: info:eu-repo/grantAgreement/ES/DGA/T87
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46505-C3-1-R
Tipo y forma: Article (Published version)
Área (Departamento): Área Expresión Gráfica en Ing. (Dpto. Ingeniería Diseño Fabri.)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)


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