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Synthesis and physical properties of uranium thin-film hydrides UH2 and UH3

2023; Elsevier BV; Volume: 775; Linguagem: Inglês

10.1016/j.tsf.2023.139860

1879-2731

E. A. Tereshina-Chitrova, L. Havela, M. Paukov, Oleksandra Koloskova, Lukáš Horák, Milan Dopita, Mayerling Martinez Celis, Miroslav Cieslar, Z. Šobáň, T. Gouder, Frank Huber,

Fusion materials and technologies

Formation of thin uranium hydrides films, UH2 and \b{eta}-UH3, synthesized by a reactive dc sputtering of uranium metal, was explored using variable deposition conditions. Obtained stable oxygen-free hydride films were studied by a variety of methods, both in situ (photoelectron spectroscopy - XPS), and ex-situ (x-ray diffraction - XRD, transmission electron microscopy - TEM), electrical resistivity, and magnetometry). Both types of hydrides are ferromagnetic, the Curie temperatures of UH2 and \b{eta}-UH3 are approx. 120 and 170 K, respectively. Ferromagnetism in the thin films is robust and does not depend on structure details while electrical resistivity data reflect disorder in both types of hydrides.