Insight into the crystal structures and physical properties of the uranium borides UB$_{1.78±0.02,}$ UB$_{3.61±0.041}$ and UB$_{11.19±0.13}$

Laura Martel (1) , Thibault Charpentier (2) , Pedro Amador Cedran (1) , Chris Selfslag (1) , Mohamed Naji (3) , Jean-Christophe Griveau (1) , Eric Colineau (1) , Rachel Eloirdi (1)

1 JRC - European Commission - Joint Research Centre [Karlsruhe]
2 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
3 LPAIS

In this study we reported the synthesis of three polycrystalline uranium borides UB$_{1.78±0.02,}$ UB$_{3.61±0.041}$ and UB$_{11.19±0.13}$ and their analyses using chemical analysis, X-ray diffraction, SQUID magnetometry, solid-state NMR, and Fourier transformed infrared spectroscopy. We discuss the effects of stoichiometry deviations on the lattice parameters and magnetic properties. We also provide their static and MAS-NMR spectra showing the effects of the 5f-electrons on the $^{11}$B shifts. Finally, the FTIR measurements showed the presence of a local disorder.

Keywords: uranium borides; magnetic susceptibility; 11 B NMR; FTIR

Domains: Material chemistry

Laura Martel, Thibault Charpentier, Pedro Amador Cedran, Chris Selfslag, Mohamed Naji, et al.. Insight into the crystal structures and physical properties of the uranium borides UB$_{1.78±0.02,}$ UB$_{3.61±0.041}$ and UB$_{11.19±0.13}$. Minerals, 2022, 12 (1), pp.29. ⟨10.3390/min12010029⟩. ⟨cea-03507034⟩