%0 Journal Article
%A Eichler, Michael
%T Investigation of hydrogen isotope retention mechanisms in beryllium: High resolution TPD measurements
%J Nuclear materials and energy
%V 19
%@ 2352-1791
%C Amsterdam [u.a.]
%I Elsevier
%M FZJ-2021-01517
%P 440 - 444
%D 2019
%X The retention of ion-implanted deuterium in beryllium poly- and single crystals at room temperature is studied using high precision temperature programmed desorption spectroscopy (TPD). Slow temperature ramps of 0.01 K/s in combination with well-defined experimental conditions are used to resolve the low temperature desorption regime for the first time revealing three sharp desorption peaks. The comparison to results of a coupled reaction diffusion system (CRDS) model shows, that the corresponding release mechanisms cannot be described by thermally activated rate processes. SEM images of a polycrystalline beryllium sample after implantation of deuterium with 2 keV per D atom show the formation of blisters of roughly 1 µm in diameter. Additionally, cracks on top of the blisters are found as well as spots, on which blisters are peeled off. Both processes are discussed to play a role in the low temperature release regime of the retained deuterium. Investigation of TPD spectra performed on single crystalline beryllium shows a jagged pattern in the low temperature release regime, which can be connected to blisters bursting up, releasing big amounts of deuterium in short time scales.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000470746100068
%R 10.1016/j.nme.2019.03.018
%U https://juser.fz-juelich.de/record/891432