| Autor: |
Ho-Chang Lee, Dokyum Kim, Jung-A Lee, Young-Woo Heo, Jeong-Joo Kim, Joon-Hyung Lee |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Journal of Science: Advanced Materials and Devices, Vol 7, Iss 3, Pp 100450- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2468-2179 |
| DOI: |
10.1016/j.jsamd.2022.100450 |
| Popis: |
The transfer energy of oxygen vacancy of La and Y co-doped CeO2 is investigated in which the total amount of La and Y is fixed at 20 at%. Although both the La3+ (1.16 Å) and Y3+ (1.032 Å) ions are larger than the Ce4+ ions (0.97 Å), individual single doping of La and Y results in an increase and a decrease in the CeO2 lattice constant, respectively, due to the effect of the critical ionic radius (rc). As the La/Y ratio varies, the lattice constant increases as the La content increases, which leads to a decrease in the migration energy of the oxygen vacancy in the grain interior. When La and Y are co-doped at a ratio of 2:18, its lattice constant is almost the same as that of pure CeO2 in which the dissociation energy of the oxygen vacancy achieves the lowest value due to the minimum lattice-strain energy. The migration energy at the grain boundary also decreases with increasing La content. This result is explained by the degree of grain boundary segregation of the dopant. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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