Investigation of the systems LaNi5Hx and LaNi5Dx by proton and deuteron nuclear magnetic resonance

Study on hydrogen diffusion behavior in AB5-type hydrogen storage alloys with galvanostatic intermittent titration technique (GITT)

“…However, preliminary studies showed that, uncertainty exists in the time t used to calculate D when Eq. (7) is selected, since a relatively longer time is Table 1 Values of (dE/dn) for MlNi 3 Table 2. It is clear that the above-mentioned deduction is correct, and it could be concluded that hydrogen diffusion coefficient in hydrogen storage alloys can be deter- Table 2 Slope of the curves shown in Fig.…”

“…Hydrogen diffusion behavior in AB 5 -type hydrogen storage alloys has been studied by applying nuclear magnetic resonance (NMR) [1][2][3], quasielastic neutron scattering (QNS) [4][5][6]. Recently, various electrochemical techniques, such as microelectrode [7][8][9], potential-step method [10][11][12], constant current discharge technique [13,14], electrochemical impedance spectroscopy [15,16], cyclic voltammetry [17], electrochemical permeation technique [18], have been used to determine the hydrogen diffusion coefficient in metal hydride electrode, respectively.…”

Low-temperature1H NMR spectra of AlH3

“…These reports proposed either no explanation at all or only a few explanations for this phenomenon. In the case of LaNi,H, [4], for example, the authors concluded that the narrow resonance line is the result of a surface coverage by molecular hydrogen. However, they were not able to observe this component below -10 K, probably because of the high magnetic susceptibility of the material.…”

LaNi5 related AB5 compounds: Structure, properties and applications

“…LaNi 5 is a Stoner-enhanced Pauli paramagnet with a magnetic susceptibility = 4.9 10 -6 emu g -1 measured by NMR [75]. LaNi 5 H 6.8 hydride displays a paramagnetic behavior with a slightly lower susceptibility with = 3.2 10 -6 emu g -1 at room temperature.…”