Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 10, Pages 3527-3538Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.04.009
Keywords
Proton-Conducting ceramic membranes; Lanthanum tungstate; Mechanical properties; Conductivity; Strength; Creep
Categories
Funding
- Helmholtz Association
- Initiative and Networking Fund
- MEM-BRAIN Portfolio
- POFIII
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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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