Effect of microstructure on electrical and mechanical properties of La5.4WO12-δ proton conductor
| Autor: | Wendelin Deibert, Lorenz Singheiser, José M. Serra, Tilmann Beck, Vasiliki Stournari, Olivier Guillon, Mariya E. Ivanova, Sonia Escolástico, Wilhelm A. Meulenberg, Jürgen Malzbender |
|---|---|
| Přispěvatelé: | Inorganic Membranes |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Conductivity
Materials science Mechanical properties 02 engineering and technology Creep 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Grain size n/a OA procedure 0104 chemical sciences Lanthanum tungstate Flexural strength Proton-Conducting ceramic membranes Materials Chemistry Ceramics and Composites Crystallite Strength Composite material 0210 nano-technology Electrical conductor Proton conductor |
| Zdroj: | Journal of the European Ceramic Society, 38(10), 3527-3538. Elsevier |
| ISSN: | 0955-2219 |
| Popis: | [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. This work was conducted thanks to the financial support by the Helmholtz Association, Initiative and Networking Fund, MEM-BRAIN Portfolio and POFIII. The colleagues from ZEA-3 are acknowledged for performing the ICP-OES analysis. We would like to thank Ms. Tatjana Osipova for the mechanical testing and Dr. Egbert Wessel for the SEM studies |
| Databáze: | OpenAIRE |
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