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Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells / M. Morales in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2504–2509 Titre : Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells Type de document : texte imprimé Auteurs : M. Morales, Auteur ; J.J. Roa, Auteur ; X. G. Capdevila, Auteur Année de publication : 2011 Article en page(s) : pp. 2504–2509 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : SOFC  Gadolinia  doped-ceria  Yttria-stabilized  zirconia  Mechanical  properties  Nanoindentation Résumé : 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008842 [article] Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells [texte imprimé] / M. Morales, Auteur ; J.J. Roa, Auteur ; X. G. Capdevila, Auteur . - 2011 . - pp. 2504–2509. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2504–2509 Mots-clés : SOFC  Gadolinia  doped-ceria  Yttria-stabilized  zirconia  Mechanical  properties  Nanoindentation Résumé : 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008842