2024-01-122024-01-122020-05Ciria Matamoros, D., Jiménez Melendo, M., Aubin, V. y Dezanneau, G. (2020). Creep properties of high dense La9.33Si6O26 electrolyte for SOFCs. Journal of the European Ceramic Society, 40 (5), 1989-1998. https://doi.org/10.1016/j.jeurceramsoc.2020.01.004.0955-22191873-619Xhttps://hdl.handle.net/11441/153307High density La9.33Si6O26 polycrystals were fabricated by conventional and spark plasma sintering starting from nanopowders synthesized by freeze-drying. The materials exhibit a homogeneous microstructure formed by equiaxed grains with average sizes of 1.1 μm and 0.2 μm-diameter depending on the sintering route. Compressive mechanical tests were performed in air at constant strain rate between 900 and 1300 °C. A gradual brittle-to-ductile transition was found with increasing temperature and/or decreasing strain rate. Grain boundary sliding is the main deformation mechanism in the ductile region, characterized by a stress exponent n = 1 for the conventional sintered (large-grained) material and n = 2 for the spark plasma sintered (fine-grained) material; in both cases, the activation energy for creep was 360 kJ/mol. Effective cation diffusivities have been derived from mechanical data by comparison with appropriate models. The creep properties of lanthanum silicates are reported here for the first time.application/pdf21 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Boundary slidingCreepGrainLanthanum silicateMechanical propertiesSOFC electrolyteinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess10.1016/j.jeurceramsoc.2020.01.004