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Resumen: Bi2Ca2Co1.7Ox thermoelectric ceramics with small Ag additions (0, 1, 2, 3, 4, and 5 wt.%) have been successfully grown from the melt, using the laser floating zone method and subsequently annealed at 800 °C for 24 h. The microstructure has shown a reduction of the amount of secondary phases for Ag contents up to 4 wt.%. This microstructural evolution leads to a decrease of the electrical resistivity values until an Ag content of 4 wt.%, whereas Seebeck coefficient has been maintained unchanged. This is in agreement with the presence of metallic Ag in all samples, confirmed not only by Energy Dispersive Spectrometry but also by X-ray photoelectron and Auger spectroscopy. These electrical properties lead to maximum power factor values of about 0.30 mW/K2.m at 650 °C for the 4 wt.% Ag containing samples, which is among the best results obtained for this type of materials.
Idioma: Inglés
DOI: 10.1016/j.actamat.2015.09.036
Año: 2016
Publicado en: ACTA MATERIALIA 102 (2016), 273-283
ISSN: 1359-6454
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013-46505-C3-1-R
Tipo y forma: Article (PostPrint)
Área (Departamento): Expresión Gráfica de la Ingeniería (Departamento de Ingeniería de Diseño y Fabricación)
Área (Departamento): Ciencia de los Materiales e Ingeniería Metalúrgica (Departamento de Ciencia y Tecnología de Materiales y Fluidos)

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Este artículo se encuentra en las siguientes colecciones:
Articles > Artículos por área > Ciencia de los Materiales e Ingeniería Metalúrgica
Articles > Artículos por área > Expresión Gráfica de la Ingeniería

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