New Uranium Iron Arsenide Discovered

New Uranium Iron Arsenide Discovered

Author: ChemistryViews

There are very few known actinide-based iron-arsenic materials, and until now, there had only been one reported uranium iron arsenide, UFeAs2. Eteri Svanidze, Max Planck Institute for Chemical Physics of Solids, Dresden, Germany, and colleagues have discovered a second uranium iron arsenide, UFe5As3.

The team used a bismuth flux method to grow crystals of the new compound. They combined uranium sheets, iron powder, arsenic pieces, and bismuth granules in an alumina crucible that was then sealed in a tantalum tube. For the reaction, the tube was heated to 1150 °C. After the reaction, the bismuth flux was separated from the product by heating to 500 °C and centrifugation.

The researchers obtained UFe5As3 in the form of gray, needle-shaped, air-stable crystals. The compound was characterized using powder X-ray diffraction, energy-dispersive X-ray spectroscopy, and magnetic measurements. The team found that UFe5As3 has a monoclinic, UCr5P3-type crystal structure in the space group P21/m.  The system showed antiferromagnetic properties below 47 K, with both U and Fe atoms likely participating in the antiferromagnetic ordering.


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