TY  - JOUR
AU  - Eichler, Michael
TI  - Investigation of hydrogen isotope retention mechanisms in beryllium: High resolution TPD measurements
JO  - Nuclear materials and energy
VL  - 19
SN  - 2352-1791
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2021-01517
SP  - 440 - 444
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000470746100068
DO  - DOI:10.1016/j.nme.2019.03.018
UR  - https://juser.fz-juelich.de/record/891432
ER  -