¹H NMR studies of the system Ti₃SbH_x

Abstract

Proton magnetic resonance measurements were carried out on hydrogenated samples Ti3SbHx, at different hydrogen concentrations in the range 0.3 ≤ x ≤ 1.74. From a comparison of the experimental second moment of the 1H NMR line with the calculated one it was inferred that hydrogen occupies the tetrahedral interstitial sites surrounded by Ti atoms in the Ti3Sb lattice. The influence of temperature in the range 100 ≤ T/K ≤ 300 on the 1H NMR in some of the hydrides showed the occurrence of motional narrowing from which the correlation frequency (vc), activation energy (Ea) and diffusion coefficient (D) were evaluated as 104 Hz, 0.10 eV, and 10−12 cm2/s, respectively. It was found that the hydrogen diffusion is easier in the Ti3Sb lattice compared to other Ti based alloys.