Deibert, W.; Stournari, V.; Ivanova, ME.; Escolástico Rozalén, S.; Serra Alfaro, JM.; Malzbender, J.; Beck, T.... (2018). Effect of microstructure on electrical and mechanical properties of La5.4WO12-delta proton conductor. Journal of the European Ceramic Society. 38(10):3527-3538. https://doi.org/10.1016/j.jeurceramsoc.2018.04.009
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/190458
Title:
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Effect of microstructure on electrical and mechanical properties of La5.4WO12-delta proton conductor
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Author:
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Deibert, Wendelin
Stournari, Vasiliki
Ivanova, Mariya E.
Escolástico Rozalén, Sonia
Serra Alfaro, José Manuel
Malzbender, Juergen
Beck, Tilman
Singheiser, Lorenz
Guillon, Olivier
Meulenberg, Wilhelm A.
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UPV Unit:
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Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química
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Issued date:
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Abstract:
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[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 ...[+]
[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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Subjects:
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Proton-Conducting ceramic membranes
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Lanthanum tungstate
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Mechanical properties
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Conductivity
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Strength
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Creep
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Copyrigths:
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Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
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Source:
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Journal of the European Ceramic Society. (issn:
0955-2219
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DOI:
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10.1016/j.jeurceramsoc.2018.04.009
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Publisher:
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Elsevier
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Publisher version:
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https://doi.org/10.1016/j.jeurceramsoc.2018.04.009
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Thanks:
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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 ...[+]
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
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Type:
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Artículo
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