Artículo
Creep properties of high dense La9.33Si6O26 electrolyte for SOFCs
Autor/es | Ciria Matamoros, Desiree
Jiménez Melendo, Manuel Aubin, V. Dezanneau, Guilhem |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2020-05 |
Fecha de depósito | 2024-01-12 |
Publicado en |
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Resumen | High 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 ... High 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. |
Agencias financiadoras | Ministerio de Ciencia, Innovación y Universidades (MICINN). España |
Identificador del proyecto | MAT2016-76526-R |
Cita | Ciria 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. |
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