Electronic structure of nitinol surfaces oxidized by low-energy ion bombardment (CROSBI ID 212264)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Petravić, Mladen ; Varašanec, Marijana ; Peter, Robert ; Kavre, Ivna ; Metikoš-Huković, Mirjana ; Yang, Y.-W.
engleski
Electronic structure of nitinol surfaces oxidized by low-energy ion bombardment
We have studied the electronic structure of nitinol exposed to low- energy oxygen-ion bombardment, using x-ray photoemission spectroscopy (XPS) and near-edge x-ray absorption fine structure (NEXAFS) spectroscopy. XPS spectra reveal a gradual transformation of nitinol surfaces into TiO2 with increased dose of implanted oxygen. No oxidation of Ni atoms has been detected. NEXAFS spectra around O K-edge and Ti L2, 3-edge, reflecting the element- specific partial density of empty electronic states, exhibit features, which can be attributed to the creation of molecular orbitals, crystal field splitting, and the absence of long-range order, characteristic of the amorphous TiO2. Based on these results, we discuss the oxidation kinetics of nitinol under low-energy oxygen- ion bombardment.
nitinol ; NEXAFS ; XPS ; electronic structure ; oxidation
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