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@ARTICLE{Koslowski:874010,
      author       = {Koslowski, Hans Rudolf and Schmitz, Janina and Linsmeier,
                      Christian},
      title        = {{S}egregation and {P}referential {S}puttering of {C}r in
                      {WC}r{Y} {S}mart {A}lloy},
      journal      = {Nuclear materials and energy},
      volume       = {22},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2020-01170},
      pages        = {100736 -},
      year         = {2020},
      abstract     = {The temperature driven segregation of Cr to the surface of
                      the tungsten-based WCrY alloy is analysed with low energy
                      ion scattering of He+ ions with an energy of 1 keV in the
                      temperature range from room temperature to 1000 K. Due to
                      the high surface sensitivity, these measurements probe only
                      the composition of the outermost monolayer. The surface
                      concentration of Cr increases slightly when the temperature
                      of the sample is increased up to 700 K and exhibits a much
                      stronger increase when the sample temperature is further
                      raised. The segregation enthalpy for Cr is obtained from the
                      Langmuir-McLean relation and amounts to 0.7 eV. The
                      surface concentration of Y shows a similar behaviour to the
                      Cr concentration. The temperature thresholds between slow
                      and accelerated surface density increases for Cr and Y are
                      nearly the same. At a temperature of 1000 K the low energy
                      ion scattering detects almost no W on the surface. The
                      modified surface composition due to the segregated species,
                      i.e. the mixed Cr/Y layer, stays stable during cool-down of
                      the sample. Preferential sputtering is investigated using
                      ion bombardment of 250 eV D atoms, resulting in an
                      increase of the W surface density at room temperature. This
                      effect is counteracted at elevated temperatures where
                      segregation replenishes the lighter elements on the surface
                      and prevents the formation of an all-W surface layer. The
                      flux of segregating Cr atoms towards the surface is
                      evaluated from the equilibrium between sputter erosion and
                      segregation.},
      cin          = {IEK-4},
      ddc          = {624},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000525256600020},
      doi          = {10.1016/j.nme.2020.100736},
      url          = {https://juser.fz-juelich.de/record/874010},
}