Experimental determination of the deuterium binding energy with vacancies in tungsten

• Published in: Journal of nuclear materials 2016-08, Vol.477, p.292-297
• Main Authors: Zibrov, M., Ryabtsev, S., Gasparyan, Yu, Pisarev, A.
• Format: Article
• Language: English
• Subjects: Binding energy; Deuterium; Diffusion rate; Heating rate; Low energy; Radiation defects; Slopes; Thermal desorption; Tungsten; Vacancies
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2016.04.052

Deuterium (D) interaction with vacancies in tungsten (W) was studied using thermal desorption spectroscopy (TDS). In order to obtain a TDS spectrum with a prominent peak corresponding to D release from vacancies, a special procedure comprising damaging of a recrystallized W sample by low fluences of 10 keV/D ions, its annealing, and subsequent low-energy ion implantation, was utilized. This experimental sequence was performed several times in series; the only difference was the TDS heating rate that varied in the range of 0.15–4 K/s. The sum of the D binding energy (Eb) with vacancies and the activation energy for D diffusion (ED) in W was then directly determined from the slope of the Arrhenius-like plot ln(β/Tm2) versus 1/Tm, where β – heating rate and Tm – position of the respective peak in the TDS spectrum. The determined value of Eb + ED was 1.56 ± 0.06 eV. •Deuterium interaction with vacancies in tungsten was studied experimentally.•A set of TDS measurements was performed at different heating rates.•The binding energy of deuterium with vacancies in tungsten was determined directly.