Diffusivity of hydrogen isotopes in liquid lithium and in solid yttrium

Abstract

The separation of tritium from liquid lithium at low concentrations is an important problem for fusion technology. One of the most promising techniques for effecting this separation involves sorbing the tritium on solid yttrium metal. Reliable diffusivity data are essential for a realistic evaluation of this technique. This paper reviews the relevant experimental diffusivity data on protlum diffusion In liquid lithium, protium diffusion in solid yttrium, and the isotope

Molecular dynamics simulation of Li surface erosion and bubble formation

“…temperatures and compared to experimental results [5][6][7][8]. The comparison with experimental data shows that the CGP-potential [3] obtained for bulk liquid Li gives the calculated results that are very close to the experimental data obtained by two different methods.…”

“…[4][5][6]. Additionally, our results of the He diffusion coefficients and experimental data for H/Li [7,8] are also shown.…”

“…The coefficients of self-diffusion in liquid Li have been measured with nuclear magnetic resonance method [5] and by capillary methods [6]. The diffusion constants for H isotopes dissolved in liquid Li were measured in [7,8].…”

Microstructures, aging behaviour and mechanical properties in hydrogen and chloride media of backward extruded Mg–Y based biomaterials

“…This value is sufficient to allow the hydrogen transport in Mg at room temperature. However, this value changes to 1.05 Â 10 À14 m 2 /s in Y at room temperature (Buxbaum and Johnson, 1985). Therefore, the diffusion of hydrogen in aged Mg-Y alloy near the grain boundaries was effectively impeded due to the aggregation of Y element.…”

The hydrogen permeability of Pd–Cu based thin film membranes in relation to their structure: A combinatorial approach

“…The uncovered yttrium between the Pd dots will oxidize and thereby making it impermeable to hydrogen, see When hydrogen enters the system through the Pd dots or strip, it diffuses to the membrane alloy layer (M). Since the hydrogen diffusion in the membrane alloy layer (diffusion coefficient typically of the order of 10 À5 cm 2 /s or higher) is orders of magnitude higher than the H diffusion through the yttrium layer (Y) (~10 À10 cm 2 /s [12]), the lateral hydrogen diffusion mainly takes place in the membrane alloy. Due to the low plateau pressure of YH 2 and YH 3 , the hydrogen laterally diffusing through the PdeCu layer will leak back into the yttrium layer to form the yttrium hydride phase.…”