Abstract
To help understand the mechanisms of irradiation-induced defect formation and evolution in nuclear fuel, systematic experimental efforts have been carried out. Ceria (CeO 2) was selected as a surrogate material for Uranium Dioxide (UO 2) due to many similar properties. Lanthanum (La) was chosen as a dopant in CeO 2 to investigate the effect of impurities. The presence of La in the CeO 2 lattice introduces a predictable initial concentration of oxygen vacancies, making it possible to characterize hypostoichiometric effects in CeO 2. The influence of two La concentrations, 5% and 25%, were examined. In situ Transmission Electron Microscopy (TEM) experiments were used to study the evolution of defect clusters and the influence of irradiation with two common fission products: Xe and Kr. The irradiations were performed on thin film, single crystal materials. The irradiation damage caused formation of dislocation loopsat 600 °C and defect clusters at room temperature. Dislocation networks form as the result of interactions of defect clusters. The dislocation loops were determined to be mainly of 1/9[1 1 1] interstitial type loops. Quantitative results were obtained to characterize the fluence and temperature effects of irradiation. Slow defect kinetics were found with irradiation on 25% La doped CeO 2 at 600 °C and it is attributed to the higher concentration of oxygen vacancies due to high La dopant level.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 239-243 |
| Number of pages | 5 |
| Journal | Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms |
| Volume | 272 |
| DOIs | |
| State | Published - Feb 1 2012 |
Keywords
- CeO
- Ex situ TEM
- In situ TEM
- Irradiation-induced defect
- Kr ion irradiation
- Lanthanum
- Xe
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Instrumentation