Influence of diffusion-annealing temperature on physical and mechanical properties of Cu-diffused bulk MgB2 superconductor

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dc.authoriddogruer, musa/0000-0002-9876-8629
dc.authoridDogruer, Musa/0000-0002-4214-9159
dc.authoridYildirim, Gurcan/0000-0002-5177-3703
dc.authoridOzturk, Ozgur/0000-0002-0391-5551
dc.contributor.authorDogruer, M.
dc.contributor.authorZalaoglu, Y.
dc.contributor.authorGorur, O.
dc.contributor.authorOzturk, O.
dc.contributor.authorYildirim, G.
dc.contributor.authorVarilci, A.
dc.contributor.authorYucel, E.
dc.date.accessioned2024-09-18T21:02:57Z
dc.date.available2024-09-18T21:02:57Z
dc.date.issued2013
dc.departmentHatay Mustafa Kemal Üniversitesien_US
dc.description.abstractThis study reports not only the effect of Cu diffusion on physical and mechanical properties of bulk MgB2 superconductors with the aid of Vickers microhardness (H-v) measurements but also the diffusion coefficient and the activation energy of copper (Cu) in the MgB2 system using the resistivity measurements for the first time. Cu diffusion is examined over the different annealing temperature such as 650, 700, 750, 800 and 850 A degrees C via the successive removal of thin layers and resistivity measurement of the sample. Further, Vickers microhardness, elastic modulus, yield strength, fracture toughness and brittleness index values of the samples studied are evaluated from microhardness measurements. It is found that all the results obtained depend strongly on the diffusion annealing temperature and applied load. The microhardness values increase with ascending the annealing temperature up to 850 A degrees C owing to the increment in the strength of the bonds between grains but decreasing with the enhancement in the applied load due to Indentation Size Effect behaviour of the bulk samples. Moreover, the diffusion coefficient is observed to enhance from 2.84 x 10(-8) to 3.22 x 10(-7) cm(2) s(-1) with the increase of the diffusion-annealing temperature, confirming that the Cu diffusion is more dominant at higher temperatures compared to lower ones. Besides, temperature dependence of the Cu diffusion coefficient is described by the Arrhenius relation D = 2.66 x 10(-3) exp(-1.09 +/- A 0.05 eV/k(B)T) and the related activation energy of the Cu ions in the MgB2 system is obtained to be about 1.09 eV. Based on the relatively low value of activation energy, the migration of the Cu ions primarily proceeds through defects such as pore surfaces and grain boundaries in the polycrystalline structure, resulting in the improvement of the physical and mechanical properties of the bulk MgB2 samples.en_US
dc.identifier.doi10.1007/s10854-012-0809-3
dc.identifier.endpage783en_US
dc.identifier.issn0957-4522
dc.identifier.issn1573-482X
dc.identifier.issue2en_US
dc.identifier.scopus2-s2.0-84878593837en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage776en_US
dc.identifier.urihttps://doi.org/10.1007/s10854-012-0809-3
dc.identifier.urihttps://hdl.handle.net/20.500.12483/13161
dc.identifier.volume24en_US
dc.identifier.wosWOS:000313799700054en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
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.subjectMicrohardness Measurementsen_US
dc.subjectFracture-Toughnessen_US
dc.subjectAu Diffusionen_US
dc.subjectHardnessen_US
dc.subjectMicroindentationen_US
dc.subjectProspectsen_US
dc.titleInfluence of diffusion-annealing temperature on physical and mechanical properties of Cu-diffused bulk MgB2 superconductoren_US
dc.typeArticleen_US

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