The influence of ion irradiation on hydrogen chemisorption and diffusion on gadolinium surfaces
| Autor: | N. Shamir, S. Zalkind, Moshe H. Mintz, Y. Eisen, A. Abaramovich, S. Cohen |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydrogen Annealing (metallurgy) Mechanical Engineering Binding energy Metals and Alloys chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Condensed Matter::Materials Science Nuclear magnetic resonance chemistry Mechanics of Materials Sputtering Chemisorption Chemical physics Materials Chemistry Irradiation 0210 nano-technology Volta potential |
| Zdroj: | Journal of Alloys and Compounds. 688:553-560 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.06.130 |
| Popis: | The role of irradiation induced surface defects on the chemisorption process of hydrogen and inward penetration of chemisorbed H atoms was studied on sputtered, with 4.5 keV Ar + ions and on annealed gadolinium surfaces. A combination of Direct Recoil Spectrometry (DRS) and Contact Potential Difference (CPD) enabled to distinct between topmost surface and subsurface processes. Simulations of irradiation-induced defects, which assume two types of defects-vacancies due to sputtering and Frenkel pairs, taking account of the annealing processes occurring at different temperatures, have reasonably reproduced the experimental Ar scattering peaks in the DR spectra. It has been concluded that the presence of surface defects has a significant effect on the binding energies of the chemisorbed hydrogen, resulting in hydrogen trapping on the surface and affects the surface to subsurface inward penetration process. |
| Databáze: | OpenAIRE |
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