Article ID Journal Published Year Pages File Type
5454146 Journal of Nuclear Materials 2017 6 Pages PDF
Abstract
U3Si2 reversibly absorbs hydrogen at very low H2 pressures (kPa range), yielding U3Si2H1.8. One characteristic desorption temperature implies that there is only one type of H sites. U3Si2 is a weak Pauli paramagnet (χ < 2·10−8 m3/mol U) with the shortest inter-uranium distances between the U atoms in different sheets (dU-U = 332 pm). The volume-expanded (10%) hydride is a spin fluctuator with temperature dependent magnetic susceptibility and a weak ferromagnetic component gradually arising below T = 100 K. The location of U3Si2H1.8 at the verge of magnetic ordering is evidenced by the low temperature specific heat with an upturn in C/T and a dramatic enhancement of the Sommerfeld coefficient of electronic specific heat γ, which reaches 500 mJ/mol f.u. K2.
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Physical Sciences and Engineering Energy Nuclear Energy and Engineering
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