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Chromium Substitution Effect on the Magnetic Structure of Iron Oxides

Chinese Physics Letters 2012年第5期29卷 217-220页

作者： Osman Murat Ozkendir Mersin University Tarsus Technical Faculty of EducationTarsusTurkey UVSOR FacilityInstitute for Molecular ScienceOkazaki 444-8585Japan

The local magnetic and electronic structures of chromium substituted iron oxide polycrystalline samples are investigated via Fe L-edge x-ray absorption near-edge structural and magnetic circular dichroism measurements.A strong dependence of atomic magnetic levels on the applied external magnetic field is *** magnetic behavior of Cr-doped iron oxides are determined to be dominantly governed by the d-d hybridization between Fe and Cr valence *** addition,the formation of CrO_(2) and Cr_(2)O_(3) chromium oxide clusters in the sample are observed to determine the magnetic ordering,***-ferromagnetic or ferromagnetic with the changing external magnetic *** results highly agree with the previous studies.

关键词： chromium ferromagnetic magnetic

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Traces of Defects in the Electronic Structure of Porous Ni—Ti Alloys

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Journal of Materials Science & Technology 2013年第4期29卷 344-348页

作者： O.M.Ozkendir E.Cengiz E.Tirasoglu Mehmet Kaya I.H.Karahan N.Orhan Tarsus Technical Faculty of Education Mersin UniversityTarsusTurkey Institute for Molecular Science UVSOR FacilityOkazaki 444-8585Japan Science Faculty Department of PhysicsKaradeniz Technical UniversityTrabzonTurkey Vocational School Adiyaman University.Adiyaman 02040Turkey Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Faculty of Arts and Sciences Department of PhysicsMustafa Kemal UniversityHatayTurkey Faculty of Technology Department of Metallurgy and Material EngineeringFirat UniversityElazigTurkey

The electronic structures of Ni-Ti shape-memory alloy samples were investigated by X-ray absorption fine structure （XAFS） spectroscopy both experimentally and theoretically. In the experimental section, the samples were measured at low temperature to determine the persistent traces of both preheating process and atomic concentration effects on the crystal and electronic structure by X-ray absorption near-edge structure （XANES） spectroscopy. As a second step, the extended-X-ray absorption fine structure （EXAFS） calculations, which are based on different choices of one electron potentials according to Ti coordinations by using the real space multiple scattering method FEFF 8.2 code, were performed. The crystallographic and electronic structures of the porous Ni-Ti alloys were tested at various temperatures ranging from 5 to 1323 K.

关键词： Electronic structure Porous Ni-Ti alloys Shape memory effect Transition metals

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