The proton spin-lattice relaxation times TI and the magnetic susceptib
ility chi have been measured in nanocrystalline PdH0.037 With the aver
age grain size of 19 nm in the temperature ranges 164-345 K (T-1) and
78-293 K (chi) The results are consistent with the picture of strongly
inhomogeneous hydrogen distribution, most of the H atoms being locate
d in grain boundary regions. In these regions the mobility of H atoms
is found to be considerably higher than in coarse-grained Pd. The anom
alous behavior of T1 and the amplitude of the free-induction decay bel
ow 230 K is attributed to the effects of the alpha --> beta phase tran
sformation. (C) 1998 Elsevier Science Ltd. All rights reserved.