Premium
La distribution on the crater surface of W‐1%La 2 O 3 produced by a single laser pulse
Author(s) -
Kaciulis Saulius,
Mezzi Alessio,
Montanari Roberto,
Richetta Maria,
Pakhomova Ekaterina,
Varone Alessandra
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6822
Subject(s) - impact crater , laser , materials science , irradiation , analytical chemistry (journal) , alloy , chemical composition , x ray photoelectron spectroscopy , thermal , radiation , optics , mineralogy , geology , chemistry , metallurgy , nuclear magnetic resonance , physics , thermodynamics , nuclear physics , chromatography , organic chemistry , astronomy
The W‐1%La 2 O 3 alloy has been irradiated by a single laser pulse (λ = 1064 nm) to simulate transient thermal loads of high energy occurring in a tokamak under operative conditions. A zone with a diameter of ~2 mm, namely, much larger than the focal spot, results to be affected by the pulse, and a crater of about 300 μm is observed in its center. La 2 O 3 particles are not present inside the crater. The change of surface morphology is accompanied by elemental redistribution. Multipoint XPS analysis evidenced that the concentration of La is very low in the crater and increases moving toward the border of the affected zone while that of W shows an opposite trend. The composition changes involve only the outmost 5 nm of the sample: through depth profiling, no differences of chemical composition were detected deeper in the alloy between the center and external border of the affected area.