NMR study of hydrogen motion in hydrogen-stabilized C15-type compounds ZrTi2Hx

Abstract The behaviour of 1 H spin relaxation times T 1 and T 1ϱ in the hydrogen-stabilized C15-type compounds ZrTi 2 H x ( x = 3.7 and 3.9) is studied over wide ranges of temperature and resonance frequency. The experimental results show strong deviations from theoretical predictions based on the Arrhenius-type behaviour of hydrogen mobility. The best description of the experimental data is found to be given by the model using a double-peak distribution of activation energies for hydrogen motion.