ACTA

XPS and UPS Valence Band Studies of Nanocrystalline Ni-Ti Alloy Thin Films

S. Pacanowski^a, J. Skoryna^a, A. Szajek^a, A. Marczyńska^a, H. Dawczak-Dębicki^a,b, M. Werwiński^a, Ł. Majchrzycki^c and L. Smardz^a
^aInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
^bFaculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
^cWielkopolska Centre of Advanced Technologies, Adam Mickiewicz University, Umultowska 89C, 60-614 Poznań, Poland

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In this contribution we study valence bands of in-situ prepared nanocrystalline NiTi and Ni₃Ti alloy thin films using X-ray and ultraviolet photoelectron spectroscopy. Additionally, theoretical valence band of NiTi alloy was calculated by ab-initio methods. The structure and morphology of the samples were studied by X-ray diffraction and atomic force microscopy, respectively. Furthermore, hydrogen absorption and desorption kinetics at a pressure of about 1000 mbar were studied in Pd covered nanocrystalline NiTi alloy thin film using four-point resistivity measurements. Results showed that modifications of the valence bands of the Ni-Ti thin films due nanocrystalline structure can influence on the room temperature hydrogen absorption and desorption kinetics.

DOI: 10.12693/APhysPolA.133.613
PACS numbers: 73.22.-f, 68.55.-a, 82.80.Pv