| AVS 65th International Symposium & Exhibition | |
| Actinides and Rare Earths Focus Topic | Wednesday Sessions |
| Session AC+AS+SA-WeA |
| Session: | Chemistry and Physics of the Actinides and Rare Earths |
| Presenter: | Tsuyoshi Yaita, Japan Atomic Energy Agency, Japan |
| Authors: | T. Yaita, Japan Atomic Energy Agency, Japan S. Suzuki, Materials Sciences Research Center, Japan Atomic Energy Agency, Japan T. Kobayashi, Materials Sciences Research Center, Japan Atomic Energy Agency, Japan H. Shiwaku, Materials Sciences Research Center, Japan Atomic Energy Agency, Japan |
| Correspondent: | Click to Email |
Lanthanide and actinide are f-electron filling series and the properties of the series on their chemical behavior are very similar if valence states are same, while an electronic configuration of the inner shell for each element is slightly different compared to the similarity in size, and the value of special elements such as Nd and Dy used as neodymium magnet is high in the use of high-tech products. Regarding actinides series, radiotoxic Am is paid for attention in the geological disposal of radioactive waste and the R&D for partitioning and transmutation technique is performed. Accordingly, intra-series separation for lanthanide and actinide with similarity in chemical behavior would be quite important for the recovery of noble metal used as high-tech parts and treatment of high-level waste prior to geological disposal, resulting that the development of useful separation system could improve economic efficiency and reduction of environmental load.
On these backgrounds, we focus on the intra-series separation for lanthanide and actinide, especially, the relationship between variation of separation efficiency in the series and systematics of structure and electronic structure, and then, we try to propose new separation concept. Especially, in this talk, we talk about the variation of hydration or complex bond distances for trivalent actinide and lanthanide series based on X-ray crystallography and EXAFS and the interpretation based on the SX-XAS/XES and theoretical calculation.