Journal
ACTA MATERIALIA
Volume 58, Issue 7, Pages 2504-2509Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.12.036
Keywords
SOFC; Gadolinia doped-ceria; Yttria-stabilized zirconia; Mechanical properties; Nanoindentation
Funding
- Spanish MCTE [MAT-2006-11080-CO2-0, MAT2008-06785-C02-01]
- University and Investigation of the University Department of Innovation and Company of the Catalan Autonomous Government of Catalonia
- European Social Fund
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The Young's modulus (E), hardness (H) and fracture toughness (K-IC) 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 degrees 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 K-IC 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 K-IC 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. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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