Physical properties and diffusion-coefficient calculation of iron diffused bi-2223 system

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dc.authorid0000-0002-6894-9082en_US
dc.authorid0000-0002-5177-3703en_US
dc.authorid0000-0002-0391-5551en_US
dc.contributor.authorÖztürk, Özgür
dc.contributor.authorAşıkuzun, Elif
dc.contributor.authorKaya, Sedanur
dc.contributor.authorCoşkunyürek, M.
dc.contributor.authorYıldırım, Gürcan
dc.contributor.authorYılmazlar, M.
dc.contributor.authorTerzioğlu, Cabir
dc.date.accessioned2021-06-23T19:29:06Z
dc.date.available2021-06-23T19:29:06Z
dc.date.issued2012
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.descriptionCali Conference 1st Centennial of Superconductivity - Trends in Nanoscale Superconductivity and Magnetism -- JUN 29-JUL 01, 2011 -- Cali, COLOMBIAen_US
dc.description.abstractThis study includes two parts: (I) investigation of the effect of different annealing time (10 h, 30 h, and 60 h) on physical, superconducting, and microstructural properties of Fe-diffused Bi-2223 superconductor ceramics prepared by the conventional solid-state reaction method with the aid of the X-ray diffraction (XRD), scanning electron microscopy (SEM), dc resistivity (rho-T) and transport critical current density (J (c) ) measurements, and (II) determination of the diffusion coefficient and the activation energy of iron in the Bi-2223 system. In the former part, the zero-resistivity transition temperature (T (c) ), phase purity, volume fraction, hole-carrier concentration, lattice parameters, surface morphology, texturing, crystallinity, grain connectivity, grain size, and room temperature resistivity values of the bulk samples are found and compared with each other. The results obtained show that both the zero resistivity transition temperature (T (c) ) and transport critical current density (J (c) ) regularly enhance with the increment in the diffusion-annealing time. The maximum T (c) of 107 +/- 0.2 K and J (c) of 50.0 A cm(-2) are observed for the sample annealed at 830 A degrees C for 60 h. As for the XRD investigations, according to the refinement of cell parameters done by considering the structural modulation, the enhancement in the diffusion-annealing is confirmed by both a decrease of the cell parameter a and an increase of the lattice parameter c of the samples, meaning that the greatest Bi-2223 phase fraction belongs to the sample annealed at 830 A degrees C for 60 h. Moreover, SEM images display that the sample has the best crystallinity, grain connectivity, and largest grain size. Based on the results, the superconducting and microstructural properties improve with the increase in the diffusion-annealing time. In the latter part, Fe diffusion in the Bi-2223 system is examined in a range of 500-830 A degrees C by the variation of the lattice parameters evaluated from the XRD patterns. The temperature dependence of the Fe diffusion coefficient is described by the Arrhenius relation D=4.27x10(-5)exp(-1.27 +/- 0.10) eV/k(B)T, and the related activation energy of the iron in the Bi-2223 system is found to be about 1.27 eV. The relatively low value of activation energy obtained illustrates that the migration of the Fe ions primarily proceeds through defects such as pore surfaces and grain boundaries in the polycrystalline structure, leading to the improvement of the microstructural and superconducting properties of the samples, supported by the results of part I. All in all, the aim of the present study is not only to analyze the role of diffusion-annealing time on superconducting and microstructural properties of Fe-diffused Bi-2223 superconductors, but also to find the diffusion coefficient and activation energy of Fe in the Bi-2223 system.en_US
dc.identifier.doi10.1007/s10948-012-1673-3
dc.identifier.endpage2487en_US
dc.identifier.issn1557-1939
dc.identifier.issn1557-1947
dc.identifier.issue7en_US
dc.identifier.scopus2-s2.0-84870255572en_US
dc.identifier.scopusqualityQ3en_US
dc.identifier.startpage2481en_US
dc.identifier.urihttps://doi.org/10.1007/s10948-012-1673-3
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7117
dc.identifier.volume25en_US
dc.identifier.wosWOS:000309157200061en_US
dc.identifier.wosqualityQ4en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorYıldırım, Gürcan
dc.institutionauthorTerzioğlu, Cabir
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofJournal Of Superconductivity And Novel Magnetismen_US
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectFe-diffused Bi-2223en_US
dc.subjectDiffusion Coefficienten_US
dc.subjectXRDen_US
dc.subjectSEMen_US
dc.titlePhysical properties and diffusion-coefficient calculation of iron diffused bi-2223 systemen_US
dc.typeConference Objecten_US

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