UF4and the High‐Pressure Polymorph HP‐UF4
| Autor: | Sergei I. Ivlev, Gunter Heymann, Hubert Huppertz, Malte Sachs, Clemens Pietzonka, Jörn Bruns, Benjamin Scheibe, Antti J. Karttunen, Florian Kraus |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
actinoids
Diffraction Analytical chemistry chemistry.chemical_element Crystal structure 010402 general chemistry 01 natural sciences Catalysis uranium chemistry.chemical_compound symbols.namesake fluorine Formula unit ta215 010405 organic chemistry Organic Chemistry high-pressure chemistry General Chemistry Hydrogen fluoride Sulfur 0104 chemical sciences chemistry Fluorine Anhydrous symbols magnetic properties Raman spectroscopy |
| Zdroj: | Chemistry – A European Journal. 25:7366-7374 |
| ISSN: | 1521-3765 0947-6539 |
| Popis: | A laboratory-scale synthesis of UF4 is presented that utilizes the reduction of UF6 with sulfur in anhydrous hydrogen fluoride. An excess of sulfur can be removed by vacuum sublimation, yielding pure UF4 , as shown by powder X-ray diffraction, micro X-ray fluorescence analysis, infrared and Raman spectroscopy, as well as magnetic measurements. Furthermore, a single-crystalline, high-pressure modification of UF4 was obtained in a multi-anvil press at elevated temperatures. The high-pressure polymorph HP-UF4 was characterized by means of single-crystal and powder X-ray diffraction, as well as by magnetic measurements, and presents a novel crystal structure type. Quantum-chemical calculations show the HP-modification to be 10 kJ mol-1 per formula unit higher in energy compared to UF4 . |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |