Yazar "Han I." seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Determination of K shell XRF parameters and K to L shell vacancy transfer probabilities of ferromagnetic 3d transition metals
    (American Institute of Physics Inc., 2017) Allm B.; U?urlu M.; Han I.; Demir L.
    In this study, K shell X-ray fluorescence cross-sections (?K?, ?K? and ?K), K shell fluorescence yields (?K) and K to L shell vacancy transfer probabilities (?KL) of ferromagnetic 3d transition metals (Fe, Co, Ni) were investigated to understand how the relationship between ferromagnetism and these values changes with atomic number by using energy dispersive X-ray fluorescence (EDXRF) technique. The all obtained experimental and theoretical results were comparatively given as a function of the atomic number. It was clearly observed that all of the investigated parameters depend on the atomic number and the ferromagnetism state of the atom. © 2017 Author(s).
  • Küçük Resim Yok
    Öğe
    Effect of external magnetic field on valence-electron structures of Fe and Ni in Invar, Permalloy and the other Fe-Ni alloys by using K?-to-K? X-ray intensity ratios
    (Elsevier Ltd, 2016) Alim B.; Han I.; Demir L.
    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. K?-to-K? X-rayin-tensity ratios of Fe and Ni in Invar(Fe 0.64 Ni 0.36 ), Permalloy(Fe 0.20 Ni 0.80 ) and Fe N - i x 1x Firstly,(x=0, 0.40, 0.52, 0.55, 0.61, and 1) alloys were measured without any magnetic field and under 0.5 and 1 T 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. © 2016 Elsevier Ltd.
  • Küçük Resim Yok
    Öğe
    Investigation of Comet Wild-2 in terms of effective atomic numbers
    (Elsevier Ltd, 2015) Han I.; Ün A.; Alimb B.
    Effective atomic numbers (Zeff) and effective electron densities (Nel) of 69 samples collected from Comet Wild-2 within scope of Stardust mission were determined in the energy range from 1 keV to 100 GeV. The data were individually evaluated for Wild-2 olivines, pyroxene, FeANi sulfide and silicate glass samples to obtain remarkable information about Comet Wild-2. The photon energy and sample composition dependencies of obtained data were investigated. The results show that Zeff and Nel values depend strongly on chemical composition and interaction photon energy. The result of present study may be providing new and helpful knowledge about the Comet Wild-2 and ourSolar System. © 2015 COSPAR. Published by Elsevier Ltd. All rights reserved.