Hydrogen diffusion in titanium and zirconium hydrides

Synthesis of LiAlH4 Nanoparticles Leading to a Single Hydrogen Release Step upon Ti Coating

“…In particular, Ti-based additives have shown benefit for enhancing dehydrogenation kinetics and reduction of the decomposition temperature of alanates [9]. Ti also forms a hydride and has good hydrogen diffusion properties [38,39]. In addition, TiCl 3 can be readily reduced by LiAlH 4 , and thus could form through the transmetalation method [19,20,31].…”

Visualization of Hydride in Titanium and Titanium-Aluminide by Refraction-Enhanced X-ray Imaging Technique

“…Because hydrogen-charging of this specimen was carried out at room temperature, in contrast to the hydrogen gas annealing, hydrogen atoms could not diffuse into the crystal on account of the high migration energy of hydrogen (0.49 eV). 12) Thus, hydrides were formed on the surface of the specimen. After X-ray observation, this specimen was annealed at 550 C for 3600 s in a vacuum.…”

NGNP Reactor Coolant Chemistry Control Study

“…Hydrides are generally very brittle, and induced stresses readily cause crack generation and propagation. 17 The cracks that are formed in the hydrides are beneficial in the base metals of getters, because these cracks potentially allow hydrogen to travel down the cracks and contact the base metal, which can then form more hydrides. This is beneficial if the goal is to capture more hydrogen.…”

“…Tritium's permeability is 1000 times that of tritiated water. 17 Gaseous tritium has a permeability of 1/sqrt(3), which is smaller than deuterium, which has a permeability of 1/sqrt(2). 14 While the HPS does specifically target tritium for removal, it will actually play a rather small role in the large-scale removal of the tritium contamination in the primary circuit.…”