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Inorg Chem. 2018 Dec 3;57(23):14727-14732. doi: 10.1021/acs.inorgchem.8b02499. Epub 2018 Nov 14.

Crystal Structure and Magnetic Properties of Uranium Hydride UH2 Stabilized as a Thin Film.

Author information

1
Faculty of Mathematics and Physics , Charles University , Ke Karlovu 5 , 12116 Prague , Czech Republic.
2
IT4Innovations & Nanotechnology Centre, VSB - Technical University of Ostrava , 17. listopadu 15 , 70833 Ostrava-Poruba , Czech Republic.
3
Directorate for Nuclear Safety and Security , European Commission, Joint Research Centre (JRC) , Postfach 2340 , D-76125 Karlsruhe , Germany.

Abstract

A new type of uranium binary hydride, UH2, with the CaF2 crystal structure, was synthesized in a thin-film form using reactive sputter deposition at low temperatures. The material has a grain size of 50-100 nm. The lattice parameter a = (535.98 ± 0.14 pm) is close to that in known Np (534.3 pm) and Pu (535.9 pm) iso-types. UH2 is a metallic ferromagnet with the Curie temperature TC ≈ 120 K. A very wide hysteresis loop indicates strong magnetocrystalline anisotropy. X-ray photoelectron spectroscopy reveals similarities with electronic structure of UH3, which is also ferromagnet with higher TC = 165 K.

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