Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7744418 | Solid State Ionics | 2018 | 7 Pages |
Abstract
Synchrotron powder diffraction measurements were performed up to 7â¯GPa on Ce1âxLuxO2âx/2 bulk samples in order to elucidate the high pressure structural properties of the system. In the studied pressure range Ce1âxLuxO2âx/2 does not show any structural phase transition. The bulk modulus as a function of the Lu content is found to broadly fall into two regimes, namely an increasing trend for 0â¯<â¯xâ¯<â¯0.2 and a linear decrease for 0.2â¯â¤â¯xâ¯â¤â¯0.4. This twofold compressibility behavior is mostly driven by two competing factors, namely the mean atomic volume for x ranging between 0.2 and 0.4, and the lattice volume at lower Lu content. Present results suggest that oxygen vacancies affect the bulk modulus value mainly above xâ¯~â¯0.2. Since pressure effects are known to be correlated to the strain acting on a thin film of similar composition, this study contributes to clarify the functional properties of doped ceria systems, such as the increased ionic conductivity of thin films subjected to a tensile strain.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Cristina Artini, Boby Joseph, Giorgio Andrea Costa, Marcella Pani,