title: Effect of external magnetic field on valence-electron structures of Fe and Ni in Invar, Permalloy and the other Fe-Ni alloys by using Kβ-to-Kα X-ray intensity ratios.
abstract: The effect of external magnetic field on the valence-electron structures of Fe and Ni in various Fe-Ni alloy compositions was investigated by using X-ray fluorescence spectroscopy. Firstly, Kβ-to-Kα X-ray intensity ratios of Fe and Ni in Invar (Fe0.64Ni0.36), Permalloy (Fe0.20Ni0.80) and FexNi1-x (x=0, 0.40, 0.52, 0.55, 0.61, and 1) alloys were measured without any magnetic field and under 0.5 and 1T external magnetic fields, separately. Later, the valence-electron structures of Fe and Ni in both pure form and alloys were obtained by comparison of measured X-ray intensity ratios with the results of multi-configurations Dirac-Fock (MCDF) calculations. The results obtained for valence-electron structures of Fe and Ni in various Fe-Ni alloys were evaluated in terms of magnetic field effect, delocalization and/or charge transfer phenomena. The results have shown that valence electron structure of Fe and Ni in Fe-Ni alloys are dependent on both external magnetic field and concentration of alloy elements.
authors.affiliation: Vocational School, Department of Electricity and Energy, Bayburt University, TR-69000 Bayburt, Turkey. Electronic address: balim@bayburt.edu.tr.
authors.forename: Bünyamin
authors.initials: B
authors.lastname: Alım
authors.affiliation: Faculty of Arts and Sciences, Department of Physics, Ağrι İbrahim Çeçen University, TR-04100 Ağrι, Turkey.
authors.forename: İbrahim
authors.initials: İ
authors.lastname: Han
authors.affiliation: Faculty of Sciences, Department of Physics, Atatürk University, TR-25240 Erzurum, Turkey.
authors.forename: Lütfü
authors.initials: L
authors.lastname: Demir
keywords: Fe–Ni alloy; Kβ-to-Kα X-ray intensity ratio; Magnetic field; Valence electron structure