Mechanical properties at the nanometric scale of GDC and YSZ used as electrolytes for solid oxide fuel cells

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dc.contributor	Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.contributor.author	Morales, Miguel
dc.contributor.author	Roa Rovira, Joan Josep
dc.contributor.author	Capdevila, X.G.
dc.contributor.author	Segarra, M.
dc.contributor.author	Piñol, Salvador
dc.date	2011-02-09
dc.identifier.citation	Morales, M. [et al.]. Mechanical properties at the nanometric scale of GDC and YSZ used as electrolytes for solid oxide fuel cells. "Acta materialia", 09 Febrer 2011, vol. 58, núm. 7, p. 2504-2509.
dc.identifier.citation	1359-6454
dc.identifier.citation	10.1016/j.actamat.2009.12.036
dc.identifier.uri	http://hdl.handle.net/2117/17493
dc.language.iso	eng
dc.relation	http://www.sciencedirect.com/science/article/pii/S1359645409008842
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject	Àrees temàtiques de la UPC::Enginyeria dels materials
dc.subject	Fuel cells
dc.subject	Piles de combustible
dc.title	Mechanical properties at the nanometric scale of GDC and YSZ used as electrolytes for solid oxide fuel cells
dc.type	info:eu-repo/semantics/publishedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	The Young’s modulus (E), hardness (H) and fracture toughness (KIC) of various compositions of gadolinia doped-ceria (GDC, GdxCe1−xO2−x/2, 0.1 ⩽ x ⩽ 0.2) and yttria-stabilized zirconia (YSZ, Y0.08Zr0.92O1.96) electrolytes were investigated by nanoindentation. All samples were produced by the sol–gel method, formed by uniaxial pressure and sintered at 1400 °C. In order to determine the mechanical properties, a Berkovich diamond tip was employed at applied loads of 5, 10, 30, 100 and 500 mN. The results were interpreted by the Oliver–Pharr method and values of KIC were determined using the method of Palmqvist cracks. The residual imprints were observed by field emission scanning electron microscopy. The results obtained showed that the H, E and KIC of GDC decreased with increasing gadolinia concentration, due to the oxygen vacancies generated by the dopant addition. As a result, the mechanical properties of GDC were significantly lower than those of YSZ electrolyte.
dc.description.abstract	Peer Reviewed

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