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We describe a study of the dynamics of hydrogen in Pr 2 Fe 17 H 4 , where isolated hexagons formed by the interstitial tetrahedral (t) sites of the metal lattice are populated by mobile hydrogen atoms. An activation energy of 0.10 eV has been determined for a localized jump process involving the hopping of these hydrogen atoms among adjacent vertices of each hexagon, slightly lower than that for hydrogen hopping in Pr 2 Fe 17 H 5 , where each hexagon is occupied by two hydrogen atoms. 0885-A08-07.1 Mater. Res. Soc. Symp. Proc. Vol. 885Edoi:10.1557/proc-0885-a08-07 fatcat:de5jln7nizezrkw7uuprnwg47e