Science & Technology

Significant variability of actinide tetrafluoride electronic structure

Thorium, uranium, neptunium, and plutonium tetrafluoride actinide powders show different colors, suggesting a variety of electronic structures. The color swatches shown here are labeled according to the Munsell system.Credits: Stephanie King, Pacific Northwest National Laboratory

Scientists have synthesized tetrafluoride powders of four radioactive elements: thorium, uranium, neptunium, and plutonium. These four elements are a series of heavy and radioactive elements, actinides. A tetrafluoride powder is a simple powder with 4 fluoride atoms per actinide atom. In this new study, scientists examined the magnetic fields of these powders. As a result, there was a significant change in the electronic structure of the powder, even though the crystal structure was almost the same. These studies reveal the transition from valence electron circulation to local behavior throughout the actinide sequence of the periodic table. In other words, in the case of atoms of light elements in a row, the electrons in the outer shell can be shared with adjacent elements, but in the case of heavy elements, the electrons are limited to atoms. This study provides the basis for future studies of the electron configuration of other materials with similar crystal structures.

The actinide element is important for the production of nuclear fuel and other energy technologies. Therefore, scientists need to accurately explain the electronic structure of these elements. This will help researchers develop future nuclear fuels, superconductors, and other materials.This study presents a new way to map the unique evolution of electronic devices structure With actinide element. Future research seeks theoretical explanations that relate experimental observations to the underlying structure.

Actinide elements such as uranium and plutonium play a leading role in energy and defense technology.However Scientific progress To maximize the potential of these technologies, we face complex theoretical problems in the analysis of heavy elements. The use of these advanced techniques also faces practical difficulties due to the special measures required to manage the risk of radioactivity. In this study, researchers synthesized a series of radioactive actinide tetrafluoride powders. These elements (thorium, uranium, neptunium, plutonium) bridge the heavy and light ends of the actinide column of the periodic table and exhibit the same crystal structure in the form of tetrafluoride.Then the scientists Actinide Tetrofluoride electronic structure by mapping local fields using nuclear magnetic resonance (NMR) spectroscopy. The spectroscopic experiments were performed at the Radionuclear Magnetic Resonance Facility of the Radiochemical Processing Laboratory, which houses equipment customized for the analysis of radioactive samples, including two NMR spectrometers and a broadband nuclear quadrupole resonance spectrometer. This work can be used as a guide for future electron correlation studies of f-block elements.

Very heavy elements supply more electrons

For more information:
Eric D. Walter et al, Measurement of local magnetic field of actinide tetrafluoride, Chemical Physics Journal (2021). DOI: 10.1063 / 5.0052323

Quote: Https: // Obtained on October 8, 2021 from Actinide tetrafluoride electronic structure with significant variability (2021) October 8, 2014)

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Significant variability of actinide tetrafluoride electronic structure Significant variability of actinide tetrafluoride electronic structure

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