Comparative study on indentation size effect, indentation cracks and superconducting properties of undoped and MgB2 doped Bi-2223 ceramics

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dc.authorid0000-0002-5177-3703en_US
dc.authorid0000-0002-4214-9159en_US
dc.contributor.authorDoğruer, Musa
dc.contributor.authorKaraboğa, Fırat
dc.contributor.authorYıldırım, Gürcan
dc.contributor.authorTerzioğlu, Cabir
dc.date.accessioned2021-06-23T19:34:27Z
dc.date.available2021-06-23T19:34:27Z
dc.date.issued2013
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractThis study examines the evaluation mechanism of MgB2 doped Bi1.8Pb0.4Sr2(MgB2)(x)Ca2.2Cu3.0Oy (0 <= x <= 1.0) superconducting ceramics prepared by conventional solid-state reaction method via dc resistivity, X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and Vickers micro hardness (Hv) measurements. Variation of room temperature resistivity, critical transition temperatures (onset and offset), phase purity, cell parameter, texturing, grain connectivity, surface morphology, crystallinity and Hv values of the materials are deduced and compared with each other for the determination of the optimum doping level in the Bi-2223 system. It is found that all the properties given above depend strongly on the MgB2 concentration. From dc resistivity investigations, each sample studied exhibits the superconducting behavior below their variable offset critical temperature values. The maximum onset (T-c(onset)) and offset (T-c(onset)) temperatures are found to be about 121.3 and 114.1 K, respectively, for the sample doped with x = 0.05. The minimum T-c(onset) of 118.6 K and T-c(onset) of 109.4 K are observed for the sample doped with x = 1.0. Similarly, XRD and SEM examinations indicate that there is an improvement in the crystal structures and surface morphologies of the superconducting materials with the increment of the MgB2 inclusions in the Bi-2223 system up to x = 0.05 beyond which the crystallinity, grain connectivity and surface morphology start to degrade regularly and in fact reach to the worst structure appearance for the doping level of x = 1.0. Furthermore, the Hv measurement results being analyzed by Meyer's law, proportional sample resistance (PSR), modified PSR, elastic-plastic deformation model, Hays-Kendall (HK) approach, Indentation-induced cracking model (IIC) allow us to derive the mechanical properties of the superconducting samples for the potential technological and industrial applications. According to the results obtained, HK approach, among the mechanical analysis methods, is determined as the most successful model for the samples (doped with x = 0, 0.1, 0.3, 0.5 and 1.0) exhibiting indentation size effect behavior whereas the IIC model is noted to be superior to other models for the other samples (doped with x = 0.01, 0.03 and 0.005) presenting reverse indentation size effect feature.en_US
dc.identifier.doi10.1007/s10854-013-1097-2
dc.identifier.endpage2338en_US
dc.identifier.issn0957-4522
dc.identifier.issue7en_US
dc.identifier.scopus2-s2.0-84879420328en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage2327en_US
dc.identifier.urihttps://doi.org/10.1007/s10854-013-1097-2
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7517
dc.identifier.volume24en_US
dc.identifier.wosWOS:000321913000020en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorDoğruer, Musa
dc.institutionauthorKaraboğa, Fırat
dc.institutionauthorYıldırım, Gürcan
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.titleComparative study on indentation size effect, indentation cracks and superconducting properties of undoped and MgB2 doped Bi-2223 ceramicsen_US
dc.typeArticleen_US

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