Metals

Experimental valence-band study of Ti(NiCu) alloys with different compositions and crystal structures

B. V. Senkovskiy^a, D. Yu. Usachov^a, A. V. Fedorov^a, A. V. Shelyakov^b, V. K. Adamchuk<sup>a

a</sup> Saint Petersburg State University
^b National Engineering Physics Institute "MEPhI", Moscow

Abstract: The density of valence-band electronic states of Ti(NiCu) alloys with different crystal structures and elemental compositions has been studied by X-ray photoelectron spectroscopy. It has been established that the change in the crystal state initiated by a martensitic transformation or a transition from the amorphous state to the crystal state does not affect the valence-band electronic state density distribution of the Ti$_{50}$Ni$_{50}$ and Ti$_{50}$Ni$_{25}$Cu$_{25}$ alloys. It has been shown that a change in the elemental composition leads to a noticeable redistribution of the electronic density in alloys of the Ti$_{50}$Ni$_{50-x}$Cu$_x$ system ($x$ = 0, 10, 15, 25, 30, 38, 50 at.%). As the copper concentration in the Ti(NiCu) alloys increases, the contribution of the Ni $d$ states in the vicinity of the Fermi level decreases, with the $d$ band of nickel shifting toward higher binding energies, and that of copper, toward lower binding energies.

Received: 29.12.2011

 English version: Physics of the Solid State, 2012, 54:8, 1533–1538

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