Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898067 | Journal of the European Ceramic Society | 2018 | 12 Pages |
Abstract
The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-δ (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 800â¯Â°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 1000â¯Â°C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-ring 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Wendelin Deibert, Vasiliki Stournari, Mariya E. Ivanova, Sonia Escolástico, José M. Serra, Jürgen Malzbender, Tilmann Beck, Lorenz Singheiser, Olivier Guillon, Wilhelm A. Meulenberg,