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Compositional and morphological analysis of Few films modified by sputtering and heating
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0001-9299-3262
Number of Authors: 4
2017 (English)In: Nuclear Materials and Energy, ISSN 2352-1791, Vol. 12, 472-477 p.Article in journal (Refereed) Published
Abstract [en]

Surface compositional changes of iron-tungsten films by deuterium (D) ion bombardment were studied by means of medium energy ion scattering, elastic recoil detection analysis and Rutherford backscattering spectrometry. The energy of the bombarding ions was 200 eV/D and the fluence was varied from 1e21 D/m2 to 1e24 D/m2. A significant increase of the tungsten concentration within the 20 nm closest to the sample surface, caused by preferential sputtering of iron, was seen for the films exposed 1e23 D/m2 or more. In the sample exposed to the highest fluence, 1e24 D/m2, the concentration of tungsten was increased from an initial 1.7 at. % up to approximately 24 at. % averaged over the 5 nm closest to the surface. The analysis was complicated by the presence of oxygen on the sample surfaces. In order to study the thermal stability of the tungsten enriched layer, the sample initially exposed to 1e23 D/m2 at room temperature was heated to 400 °C in the measurement chamber for medium energy ion scattering and several spectra were recorded at intermediate temperatures. The obtained data showed that the layer was relatively stable below 200 °C whereas a drastic change in the film composition occurred between 200 °C and 250 °C due to interdiffusion of iron and silicon, the latter of which was the substrate material. The surface morphologies of the films were probed with atomic force microscopy showing that protrusions of 10–100 nm width appeared after deuterium bombardment at fluences higher than 1e22 D/m2.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 12, 472-477 p.
National Category
Fusion, Plasma and Space Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-216945DOI: 10.1016/j.nme.2017.03.002ISI: 000417293300073Scopus ID: 2-s2.0-85015302256OAI: oai:DiVA.org:kth-216945DiVA: diva2:1152370
Note

QC 20171025

Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2017-12-29Bibliographically approved

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