Effect of microstructure on electrical and mechanical properties of La5.4WO12-delta proton conductor
[EN] The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-delta (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show pr...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/190458 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/190458 |
| Access Level: | acceso abierto |
| Palabra clave: | Proton-Conducting ceramic membranes Lanthanum tungstate Mechanical properties Conductivity Strength Creep |
| Sumario: | [EN] The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-delta (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show predominately proton conductor behaviour below 800 degrees C and become predominant n-type and oxygen ion conductors above this temperature. The magnitude of the total conductivity is enhanced with larger grain size and lower porosity. Young's modulus decreased by 20% with increasing temperature up to 1000 degrees C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-nng bending tests, yielding values that strongly depended on microstructural characteristics and homogeneity of the microstructure. Elevated temperature deformation studies revealed that creep is governed by cation diffusion mechanism. |
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