Effect of diffusion-annealing time (0.5 h <= t <= 2 h) on the mechanical and superconducting properties of Cu-diffused bulk MgB2 superconductors by use of experimental and different theoretical models

dc.authorid0000-0002-4214-9159en_US
dc.authorid0000-0002-5177-3703en_US
dc.contributor.authorDoğruer, Musa
dc.contributor.authorZalaoğlu, Yusuf
dc.contributor.authorYıldırım, Gürcan
dc.contributor.authorVarilci, Ahmet
dc.contributor.authorTerzioğlu, Cabir
dc.date.accessioned2021-06-23T19:34:32Z
dc.date.available2021-06-23T19:34:32Z
dc.date.issued2013
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractThis study reports the effect of different annealing time (0.5 h a parts per thousand currency sign t a parts per thousand currency sign 2 h) on the electrical, physical, microstructural, mechanical and superconducting properties of Cu-diffused bulk magnesium diboride (MgB2) system by means of dc resistivity, X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and microhardness measurements (H (v) ). The room temperature resistivity (at 300 K), critical transition (T (c) (offset) and T (c) (onset) ) temperature, variation of transition temperature, grain size, phase purity, lattice parameter, texturing, surface morphology, crystallinity and Vickers microhardness values of the samples are evaluated and compared with each other. The resistivity results obtained reveal that the (T (c) (offset) and T (c) (onset) ) values of the samples produced ascend with the enhancement in the annealing time up to 1 h beyond which these values start to reduce systematically and in fact the smallest T (c) (onset) of 38.1 K and T (c) (offset) of 36.2 K are observed for the sample annealed for 2 h. Similarly, the SEM micrographs display that the surface morphology, crystallinity and grain connectivity improve until a certain diffusion-annealing time (1 h), and after this point, all the properties obtained start to degrade with the increase of the annealing time. Furthermore, the peak intensities, grain sizes and lattice parameters deduced from the XRD measurements illustrate that a systematic elongation in the a and c axis lengths is detected with the annealing time until 1 h beyond which a regular contraction in the lattice parameters is observed for the samples. Likewise, the peak intensities belonging to MgB2 phase enhance with the increment of the annealing time up to 1 h after which they reduce slowly; however, a new peak belonging to Mg2Cu phase appears in the sample annealed for the duration of 2 h, confirming both the reduction of the grain size and degradation of the critical temperature. Additionally, we have focused on the microhardness measurements for the examination of the mechanical properties of the samples studied. Experimental results of microhardness measurements are estimated using the various models such as Meyer's law, proportional sample resistance model, modified proportional sample resistance model and Hays-Kendall (HK) approach. Based on the simulation results obtained, the Hays-Kendall (HK) approach is determined as the most suitable model describing the mechanical properties of samples prepared.en_US
dc.identifier.doi10.1007/s10854-012-1051-8
dc.identifier.endpage2026en_US
dc.identifier.issn0957-4522
dc.identifier.issue6en_US
dc.identifier.scopus2-s2.0-84878719986en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage2019en_US
dc.identifier.urihttps://doi.org/10.1007/s10854-012-1051-8
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7547
dc.identifier.volume24en_US
dc.identifier.wosWOS:000319354100046en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorDoğruer, Musa
dc.institutionauthorZalaoğlu, Yusuf
dc.institutionauthorYıldırım, Gürcan
dc.institutionauthorVarilci, Ahmet
dc.institutionauthorTerzioğlu, Cabir
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal Of Materials Science-Materials In Electronicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleEffect of diffusion-annealing time (0.5 h <= t <= 2 h) on the mechanical and superconducting properties of Cu-diffused bulk MgB2 superconductors by use of experimental and different theoretical modelsen_US
dc.typeArticleen_US

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