Role of diffusion-annealing time on the superconducting, microstructural and mechanical properties of Cu-diffused bulk MgB2 superconductor

dc.authorid0000-0002-0391-5551en_US
dc.authorid0000-0002-4214-9159en_US
dc.authorid0000-0002-5177-3703en_US
dc.contributor.authorDoğruer, Musa
dc.contributor.authorGörür, Osman
dc.contributor.authorZalaoğlu, Yusuf
dc.contributor.authorÖztürk, Özgür
dc.contributor.authorYıldırım, Gürcan
dc.contributor.authorVarilci, Ahmet
dc.contributor.authorTerzioğlu, Cabir
dc.date.accessioned2021-06-23T19:35:09Z
dc.date.available2021-06-23T19:35:09Z
dc.date.issued2013
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractIn this study, the effect of various annealing time (0.5, 1, 1.5 and 2 h) on microstructural, mechanical and superconducting properties of the Cu-diffused bulk MgB2 superconducting samples is investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers microhardness (H-v) and dc resistivity measurements for the first time. The critical transition temperature, grain size, phase purity, lattice parameter, surface morphology, crystallinity and room temperature resistivity values of the bulk samples prepared are compared with each other. Electrical-resistivity measurements show that the sample (annealed at 850 degrees C for 1 h), exhibiting the highest room temperature resistivity, obtains the maximum zero resistivity transition temperature (T-c). From the XRD results, all the samples contain MgB2 as the main phase with a very small amount of Mg2Cu phase. Moreover, SEM investigations conducted for the microstructural characterization illustrate that not only does the grain size of the samples studied enhance gradually, but the surface morphology and grain connectivity also improve with the increase in the diffusion-annealing time up to 1 h beyond which all the properties obtained start to degrade. Indeed, the worst surface morphology is observed for the Cu-diffused bulk MgB2 superconductor exposed to 2 h annealing duration. At the same time, Vickers microhardness, elastic modulus, load independent hardness, yield strength, fracture toughness and brittleness index values are calculated separately for the pure and Cu-diffused samples. It is found that the microhardness values depend strongly on the diffusion-annealing time. Furthermore, the diffusion coefficient of the Cu ion in the bulk MgB2 superconductor is obtained to change from 1.63 x 10(-7) to 2.58 x 10(-7) cm(2) s(-1). The maximum diffusion coefficient is observed for the sample prepared at 850 degrees C for 1 h whereas the minimum one is noted for the sample annealed at 850 degrees C for 2 h, confirming that the annealing-time of 1 h is the best ambient to improve the mechanical, microstructural and superconducting properties of the samples produced.en_US
dc.identifier.doi10.1007/s10854-012-0755-0
dc.identifier.endpage361en_US
dc.identifier.issn0957-4522
dc.identifier.issn1573-482X
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-84871944402en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage352en_US
dc.identifier.urihttps://doi.org/10.1007/s10854-012-0755-0
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7724
dc.identifier.volume24en_US
dc.identifier.wosWOS:000313799400051en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorDoğruer, Musa
dc.institutionauthorGörür, Osman
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.titleRole of diffusion-annealing time on the superconducting, microstructural and mechanical properties of Cu-diffused bulk MgB2 superconductoren_US
dc.typeArticleen_US

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