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AbrlracL Muon spin relaxation (0s) aperimenu were mrried out in zero field on polycrystalline samples of Hf2Co and HfiCoHs. In lhe unhydrided alloy the muon preferentially oacupies Octahedral intess1iee-s and diEuses through a tunnelling mechanism within lhe network made oi adjacent octahedra above PO K In mnlrast, the muon -pies lelrahedral inlemtices in the hydrided alloy. Muon diffusion takes place through two distinct phonon-assisted tunnelling mechanisms wilh a possible contribution of overbarrier hopping above 250 & and appears lo be slrongly enhaneed by the presence of hydrogen. This eEed b attribuled U) the different pathways taken bj the muon in hydrided and unhydrided Hf2Co. A comparison with llie hydrogen jump rate measured by pwlurbed angular correlation in the same hydride provides confirmation that the hydrogen mobility is indeed faster than that of the muon, which appears lo be a quite general result in concentrated metallic hydrides.

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