Influence of the lamella structure and high isostatic pressure on the critical current density in in situ MgB2 wires without a barrier

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dc.authorid0000-0003-3183-7017en_US
dc.authorid0000-0002-0676-5229en_US
dc.authorid0000-0002-9705-8932en_US
dc.authorid0000-0001-5091-2890en_US
dc.authorid0000-0003-1610-7446en_US
dc.authorid0000-0002-6960-3745en_US
dc.authorid0000-0002-9810-2659en_US
dc.authorid0000-0003-2276-6747
dc.authorid0000-0001-8168-3242
dc.contributor.authorMroczek, Z.
dc.contributor.authorMorawski, A.
dc.contributor.authorCzujko, T.
dc.contributor.authorKaraboğa, Fırat
dc.contributor.authorAkdoğan, Mustafa
dc.contributor.authorZaleski, A. J.
dc.contributor.authorMalecka, M.
dc.contributor.authorYetiş, Hakan
dc.contributor.authorBelenli, İbrahim
dc.date.accessioned2021-06-23T19:52:04Z
dc.date.available2021-06-23T19:52:04Z
dc.date.issued2019
dc.departmentBAİBÜ, Mehmet Tanrıkulu Sağlık Hizmetleri Meslek Yüksekokulu, Tıbbi Hizmetler ve Teknikler Bölümüen_US
dc.description.abstractIn this article, the significant impact of a lamellar (layered) structure and a high isostatic pressure on the normal state resistance (R-n), critical temperature (T-c), irreversible magnetic field (B-irr), upper magnetic field (B-c2) and critical current densities (J(c)) at 4.2 K and 20 K was presented. Our research showed that annealing at temperatures in the range of 630 degrees C-680 degrees C (above the melting point of Mg) at atmospheric pressure (0.1 MPa) did not create a lamellar (layered) structure. This led to low T-c, J(c) and B-irr, and high R-n. The analysis, made by using scanning electron microscopy (SEM), showed that the annealing temperature increased up to 700 degrees C under a pressure of 0.1 MPa, which created a lamellar structure. This led to significant growth of T-c, J(c) and B-irr and a slight increase of R-n. Moreover, the measurements showed that annealing at temperatures from 630 degrees C to 700 degrees C did not change the B-c2 value. In comparison to pressureless heat treatment, annealing under the high isostatic pressure of 1.1 GPa obtained a lamellar structure with layers of lower thickness and higher density. This led to significant increases in J(c) and B-irr and a visible reduction of R-n. SEM analysis showed that the increase of isostatic pressure up to 0.3 GPa created a lamellar structure with thicker layers and lower density. This microstructure led to lower J(c) and B-irr and significantly higher R-n. On the other hand, the SEM analysis showed that annealing under 0.8 GPa did not cause the formation of a layered structure, and as a result, it led to significant reductions in B-irr and J(c) (4.2 K and 20 K) and higher R-n. The increase of the isostatic pressure from 0.1 MPa to 1.1 GPa did not affect T-c (B = 0 T) and B-c2. The results indicated that the layered structure obtained a high density of pinning centers, which were particularly effective at higher magnetic fields. J(c) of 100 A/mm(2) in 8 T at 4.2 K was obtained in in situ undoped MgB2 wires after annealing at 700 degrees C for 40 min under an isostatic pressure of 1.1 GPa. (C) 2018 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.jallcom.2018.10.269
dc.identifier.endpage645en_US
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-85055737646en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage636en_US
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2018.10.269
dc.identifier.urihttps://hdl.handle.net/20.500.12491/10092
dc.identifier.volume776en_US
dc.identifier.wosWOS:000453826200074en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorKaraboğa, Fırat
dc.institutionauthorYetiş, Hakan
dc.institutionauthorAkdoğan, Mustafa
dc.institutionauthorBelenli, İbrahim
dc.language.isoenen_US
dc.publisherElsevier Science Saen_US
dc.relation.ispartofJournal Of Alloys And Compoundsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectHigh-Tc Superconductorsen_US
dc.subjectMgB2en_US
dc.subjectHigh-pressureen_US
dc.titleInfluence of the lamella structure and high isostatic pressure on the critical current density in in situ MgB2 wires without a barrieren_US
dc.typeArticleen_US

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