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Crystal and electronic structure study of mn doped wurtzite Zno nanoparticles

Progress in Natural Science:materials International 2016年第4期26卷 347-353页

作者： o.m.ozkendir S.Yildirimcan A.Yuzer K.ocakoglu Department of Energy Systems Engineering Mersin University Tarsus Faculty of Technology Advanced Technology Research & Application Center Mersin University Faculty of Engineering Department of Electrical-Electronics Engineering Toros University

The change in the crystal and electronic structure properties of wurtzite Zno nanoparticles was studied according to mn doping in the powder samples. The investigations were conducted by X-ray Absorption Fine Structure Spectroscopy(XAFS) technique for the samples prepared with different heating and doping processes. Electronic analysis was carried out by the collected data from the X-ray Absorption Near-Edge Structure Spectroscopy(XANES) measurements. Additional crystal structure properties were studied by Extended-XAFS(EXAFS) analysis. Longer heating periods for the undoped wurtzite Zno samples were determined to own stable crystal geometries. However, for some doped samples, the distortions in the crystal were observed as a result of the low doping amounts of mn which was treated as an impurity. Besides, the changes in oxygen locations were determined to create defects and distortions in the samples.

关键词： Electronic materials Nanostructures oxides XAFS(EXAFS and XANES) Crystal structure

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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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