HYDROGEN DIFFUSION IN BETA-PHASE TITANIUM IRON HYDRIDE

NMR pulse techniques have been used to measure proton relaxation times in high purity β-TiFeH1.03 between 94K and 413K. Recent crystal structure parameters from neutron diffraction studies of orthorhombic β-TiFeDx have been explicitly included in the analysis of the T2 relaxation times to obtain more accurate hydrogen diffusion parameters than were possible from previous NMR studies of β-TiFeHx. The room temperature (300K) hydrogen diffusion constant in β-TiFeHx is verified to be about 1.2 ± 0.8 × 10-12cm2/s, which is 10-4-10-5times smaller than in many other metal hydrides such as PdHx or LaNi5Hx. © 1979.