UF 4 and the High-Pressure Polymorph HP-UF 4

Benjamin Scheibe, Jörn Bruns, Gunter Heymann, Malte Sachs, Antti J. Karttunen, Clemens Pietzonka, Sergei I. Ivlev, Hubert Huppertz, Florian Kraus*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A laboratory-scale synthesis of UF 4 is presented that utilizes the reduction of UF 6 with sulfur in anhydrous hydrogen fluoride. An excess of sulfur can be removed by vacuum sublimation, yielding pure UF 4 , 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 UF 4 was obtained in a multi-anvil press at elevated temperatures. The high-pressure polymorph HP-UF 4 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 UF 4 .

Original languageEnglish
Pages (from-to)7366-7374
Number of pages9
JournalChemistry - A European Journal
Volume25
Issue number30
DOIs
Publication statusPublished - 28 May 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • actinoids
  • fluorine
  • high-pressure chemistry
  • magnetic properties
  • uranium

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