UCoSiH0.7: new representative of UTSiHx hydrides

• Published in: Journal of alloys and compounds Vol. 383; no. 1-2; pp. 103 - 107
• Main Authors: Miliyanchuk, K., Kolomiets, A.V., Havela, L., Andreev, A.V.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 30-11-2004; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Hydrides; Magnetic properties; Magnetic properties and materials; Physics; Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.); Uranium intermetallics; Uranium intermetallics; Hydrides; Magnetic properties; Intermetallic compounds; Thermal decomposition; Magnetic ordering; Spin fluctuations; Curie-Weiss law; Hydrogenation; Crystal symmetry; Magnetic susceptibility; Hexagonal lattices; Actinides; Uranium; Paramagnetic materials; Orthorhombic lattices; Magnetic structure; Crystal structure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2004.04.016

The crystal structure and magnetic properties of the hydride UCoSiH0.7 and products of its thermal decomposition were studied. The hydrogenation of UCoSi leads to the modification of the crystal structure: the symmetry increases from orthorhombic (TiNiSi structure type) to hexagonal (ZrBeSi structure type) for UCoSiH0.7. UCoSi is a weak paramagnet. The hydrogenation enhances magnetic susceptibility, but does not yield magnetic ordering. The tendency observed for Curie–Weiss (CW) parameters, i.e. the shift of θP to less negative values and slight increase of effective moments, can be understood as due to a reduction of the characteristic energy of spin fluctuations.