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@ARTICLE{Heuser:188358,
      author       = {Heuser, Brent J. and Trinkle, Dallas R. and Jalarvo, Niina
                      and Serio, Joseph and Schiavone, Emily J. and Mamontov,
                      Eugene and Tyagi, Madhusudan},
      title        = {{D}irect {M}easurement of {H}ydrogen {D}islocation {P}ipe
                      {D}iffusion in {D}eformed {P}olycrystalline {P}d {U}sing
                      {Q}uasielastic {N}eutron {S}cattering},
      journal      = {Physical review letters},
      volume       = {113},
      number       = {2},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-01764},
      pages        = {025504},
      year         = {2014},
      abstract     = {The temperature-dependent diffusivity D(T) of hydrogen
                      solute atoms trapped at dislocations—dislocation pipe
                      diffusion of hydrogen—in deformed polycrystalline PdHx
                      (x∼10−3  [H]/[Pd]) has been quantified with
                      quasielastic neutron scattering between 150 and 400 K. We
                      observe diffusion coefficients for trapped hydrogen elevated
                      by one to two orders of magnitude above bulk diffusion.
                      Arrhenius diffusion behavior has been observed for
                      dislocation pipe diffusion and regular bulk diffusion, the
                      latter in well-annealed polycrystalline Pd. For regular bulk
                      diffusion of hydrogen in Pd we find
                      D(T)=D0exp(−Ea/kT)=0.005exp(−0.23  eV/kT)  cm2/s,
                      in agreement with the known diffusivity of hydrogen in Pd.
                      For hydrogen dislocation pipe diffusion we find
                      D(T)≃10−5exp(−Ea/kT)  cm2/s, where Ea=0.042 and
                      0.083 eV for concentrations of 0.52×10−3 and
                      1.13×10−3[H]/[Pd], respectively. Ab initio computations
                      provide a physical basis for the pipe diffusion pathway and
                      confirm the reduced barrier height.},
      cin          = {Neutronenstreuung ; JCNS-1 / JCNS-SNS},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-SNS-20110128},
      pnm          = {54G - JCNS (POF2-54G24) / 451 - Soft Matter Composites
                      (POF2-451)},
      pid          = {G:(DE-HGF)POF2-54G24 / G:(DE-HGF)POF2-451},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000339171300020},
      doi          = {10.1103/PhysRevLett.113.025504},
      url          = {https://juser.fz-juelich.de/record/188358},
}