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Title: 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 TiO{sub 2} with increased dose of implanted oxygen. No oxidation of Ni atoms has been detected. NEXAFS spectra around O K-edge and Ti L{sub 2,3}-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 TiO{sub 2}. Based on these results, we discuss the oxidation kinetics of nitinol under low-energy oxygen-ion bombardment.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Department of Physics and Center for Micro and Nano Sciences and Technologies, University of Rijeka, 51000 Rijeka (Croatia)
  2. Department of Electrochemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, 10000 Zagreb (Croatia)
  3. National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan (China)
Publication Date:
OSTI Identifier:
22304047
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTROSCOPY; CRYSTAL FIELD; ELECTRONIC STRUCTURE; FINE STRUCTURE; ION IMPLANTATION; NICKEL ALLOYS; OXIDATION; OXYGEN IONS; PHOTOEMISSION; SPECTRA; SURFACES; TITANIUM ALLOYS; TITANIUM OXIDES; TRANSFORMATIONS; X RADIATION; X-RAY PHOTOELECTRON SPECTROSCOPY; X-RAY SPECTROSCOPY