%0 Journal Article
%A Koslowski, H. R.
%A Bhattacharyya, S. R.
%A Hansen, P.
%A Linsmeier, Ch.
%A Rasiński, M.
%A Ström, P.
%T Temperature-dependent in-situ LEIS measurement of W surface enrichment by 250 eV D sputtering of EUROFER
%J Nuclear materials and energy
%V 16
%@ 2352-1791
%C Amsterdam [u.a.]
%I Elsevier
%M FZJ-2018-04554
%P 181 - 190
%D 2018
%X Tungsten surface enrichment of EUROFER steel by 250 eV deuterium sputtering is in-situ measured using low energy He$^{+}$ ion scattering spectroscopy. The samples are irradiated at various temperatures between 300 K and 800 K with a deuterium atom flux of 2e18 m$^{-2}$s$^{-1}$ and maximum fluence up to 1.1e23 m$^{-2}$. The measurements at room temperature show a clear increase of tungsten surface density, but already at 520 K the observed enrichment is only half as large. At a temperature of 800 K no tungsten surface enrichment is detectable. The obtained data allows to determine an upper limit of 1.6 eV for the diffusion activation energy of tungsten in EUROFER.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000442226800028
%R 10.1016/j.nme.2018.07.001
%U https://juser.fz-juelich.de/record/850780