| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Seaborg Institutes: Emerging Topics in Actinide Sciences
|
| Presentation Title |
A Rare Bird: U+5 and U+6 in Uranium Sulfides |
| Author(s) |
Anna Berseneva, Hanno-Conrad Zur Loye |
| On-Site Speaker (Planned) |
Anna Berseneva |
| Abstract Scope |
Chalcogen environments tend to stabilize low oxidation states: more than 97% of U-containing chalcogenides have oxidation states of U that do not exceed +4. This talk will discuss synthetic challenges to obtain Na2Cu5U+5S6, Na3Cu4U+5S6, Na5Cu6U+5U+6S8(S2)3, and Cu6U+6S6, and provide support for the uranium oxidation states via bond valence sum analysis and X-ray absorption near edge spectroscopy. Another part of the talk will be focused on the magnetic properties of U+5-sulfides. While Na2Cu5U+5S6 and Na3Cu4U+5S6, with an f1 electron configuration, exhibit antiferromagnetic behavior with transition temperatures of 4.7 K and 3.4 K, Na5Cu6U+5U+6S8(S2)3 showed no magnetic ordering. Interestingly, for all of those compositions, the effective magnetic moment of U+5 was reduced to ~ 1.1 μB and cannot be described by either the spin-only or the total angular momentum models, highlighting the complexity of the interaction between 5f electrons and the ligands. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Nuclear Materials, Electronic Materials |