The effect of Ar ambient pressure and annealing duration on the microstructure, superconducting properties and activation energies of MgB2 superconductors

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dc.authorid0000-0002-6894-9082en_US
dc.authorid0000-0002-0391-5551
dc.authorid0000-0002-2752-9671
dc.contributor.authorÖztürk, Özgür
dc.contributor.authorAşıkuzun, Elif
dc.contributor.authorKaya, Şeydanur
dc.contributor.authorKoç, Nevin Soylu
dc.contributor.authorErdem, Murat
dc.date.accessioned2021-06-23T19:48:54Z
dc.date.available2021-06-23T19:48:54Z
dc.date.issued2017
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractMgB2 samples are produced by ex situ reaction method under vacuum, and various (0, 10, 20 Bar) Ar pressure for 0.5 and 1 h. The effect of ambient pressure and annealing duration on the microstructure and electrical properties of bulk samples are investigated. XRD, SEM, and magnetoresistance measurements are made. The a and c lattice parameters and the grain size values are the highest for the samples produced under vacuum and their values decrease with increasing Ar pressure. Moreover, these values increase when the annealing duration increases from 0.5 to 1 h. The increasing pressure reduces the bond lengths between the atoms thus the grain sizes decrease. Smaller grain size promotes the connection between grains which results in an increase of the critical current density (J(c)). SEM micrographs reveal that the produced samples have granular structure which is a characteristic feature of MgB2. The decrease of grain sizes and thus enhancement in grain connectivity with increasing pressure is also confirmed by SEM images. Magneto resistivity measurements show that T-c values of the samples produced under vacuum are the highest. Tc values decrease with increasing ambient pressure and applied magnetic field. The activation energies (U-0) of the samples are calculated using Arrhenius plots due to thermally activated flux flow theory. Existence and increase of Ar pressure causes increase of activation energies. The samples produced with 0.5-h annealing have higher activation energies than the ones produced with 1-h annealing.en_US
dc.identifier.doi10.1007/s10948-016-3877-4
dc.identifier.endpage1169en_US
dc.identifier.issn1557-1939
dc.identifier.issn1557-1947
dc.identifier.issue5en_US
dc.identifier.scopus2-s2.0-85028277854en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage1161en_US
dc.identifier.urihttps://doi.org/10.1007/s10948-016-3877-4
dc.identifier.urihttps://hdl.handle.net/20.500.12491/9246
dc.identifier.volume30en_US
dc.identifier.wosWOS:000399178700005en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorKoç, Nevin Soylu
dc.institutionauthorErdem, Murat
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal Of Superconductivity And Novel Magnetismen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectSuperconductivityen_US
dc.subjectMgB2en_US
dc.subjectActivation Energyen_US
dc.subjectMagnetoresistivityen_US
dc.titleThe effect of Ar ambient pressure and annealing duration on the microstructure, superconducting properties and activation energies of MgB2 superconductorsen_US
dc.typeArticleen_US

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