Nuclear magnetic resonance study of hydrogen mobility in LaY2Ni9Hx and CeY2Ni9Hx

The temperature dependences of the proton spin-lattice relaxation rates R1 measured at 14, 23.8 and 90 MHz for LaY2Ni9H10.3. The frequency-dependent increase in R1 at T>250 K indicates the onset of the motional contribution to the relaxation rates.