Ion-implanted deuterium accumulation in a deposited tungsten coating

Deuterium-ion implantation into composite structures with tungsten coatings

“…The concentration of D + particles in W (in at %) was estimated using data [18] on the distribution profiles of 6 keV D + ions in W and their total range λ t in the interval 300 ≤ λ t ≤ 1100 nm and radiation dose in the interval 0.032 × 10 18 ≤ Φ ≤ 1.7 × 10 18 cm -2 . According to [15], with an increase of Φ in the range 0.05 × 10 18 ≤ Φ ≤ 1.65 × 10 18 cm -2 , the con centration of D particles increases from 0.5 to 4.2 at % and from 0.45 to 3.25 at % for both composition types, correspondingly. In addition, the coefficient of deute rium capture decreases from approximately 0.09 to 0.03.…”

“…Studies of deute rium accumulation accompanied by the formation of solid solutions and their disintegration in the crystal lattice of tungsten coatings were not carried out. This work continues investigations of the processes accom panying the implantation of deuterium ions into composite structures with tungsten coatings (the pro cesses of accumulation, retention and thermodes orption) [14][15][16][17]. The influence of the thickness of the coating, the system composition and the radiation dose of D + ions on the aforementioned processes was established.…”

“…Accumulation on of deuterium ions in tungsten coatings of composite structures SS + W and SS + Cu + W with the increase of the radiation dose Φ was studied earlier by the authors [15] using the depen dences C = f(Φ) and η = f(Φ). The concentration of D + particles in W (in at %) was estimated using data [18] on the distribution profiles of 6 keV D + ions in W and their total range λ t in the interval 300 ≤ λ t ≤ 1100 nm and radiation dose in the interval 0.032 × 10 18 ≤ Φ ≤ 1.7 × 10 18 cm -2 .…”

“…The other part reaches the substrate of stainless steel or the copper layer, respectively. The authors of this work [14,15], having performed TDS experiments on the release of deuterium from the sub strate of stainless steel, established that D + ions are accumulated in stainless steel with concentrations comparable to the values of C in W(nm), at the same conditions. A monotonic increase in C and η with Φ increase for the composition SS + W(nm) probably points to the capture of gas both in the W coating and in the substrate.…”

“…The spectra of deuterium thermal desorption represent the temperature dependences of the amount S [cm -2 ] of deuterium desorbed at the temperature T. The corresponding spectra were stud ied in the temperature range of 290-1600 K and a sample heating rate of α = 0.8 K s -1 . The TDS and XRD methods are described in details in [14,15]. The evolution of the surface morphology and microstruc ture of D + irradiated W coatings was studied by REM 100U and EMV 100L scanning and transmis sion electron microscopes.…”