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@ARTICLE{Koslowski:877589,
      author       = {Koslowski, H. R. and Schmitz, Janina and Linsmeier, Ch.},
      title        = {{T}emporally resolved {LEIS} measurements of {C}r
                      segregation after preferential sputtering of {WC}r{Y} alloy},
      journal      = {Nuclear instruments $\&$ methods in physics research / B
                      Beam interactions with materials and atoms},
      volume       = {479},
      issn         = {0168-583X},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2020-02311},
      pages        = {42 - 46},
      year         = {2020},
      abstract     = {The dynamic behaviour of thermally driven segregation of Cr
                      to the surface of WCrY smart alloy is studied with low
                      energy ion scattering (LEIS). Sputtering the WCrY sample
                      with 500 eV ions at room temperature results in preferential
                      removal of the lighter alloy constituents and causes an
                      almost pure W surface layer. At elevated temperatures above
                      700 K the segregation of Cr atoms towards the surface sets
                      in and prevents the formation of a pure W layer. The
                      simultaneous heating and sputtering of the sample leads to a
                      surface state which reflects the balance between sputter
                      removal and segregation flux, and deviates from the
                      equilibrium due to thermally driven segregation. Stopping
                      the sputter ion beam allows the system to relax and develop
                      toward the segregation equilibrium. The time constants for
                      the temporal changes of W and Cr surface coverage are
                      obtained from a series of LEIS measurements. The segregation
                      enthalpy is determined from the time constants obtained for
                      various sample temperatures.},
      cin          = {IEK-4},
      ddc          = {530},
      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:000570133600007},
      doi          = {10.1016/j.nimb.2020.06.005},
      url          = {https://juser.fz-juelich.de/record/877589},
}