Determination of solid solubility level of Ho nanoparticles in Y-123 superconducting matrix and strong Cu-1 site preference of nanoparticles

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dc.authorid0000-0002-0759-0598en_US
dc.authorid0000-0002-3944-0367en_US
dc.authorid0000-0002-4214-9159en_US
dc.authorid0000-0002-5177-3703en_US
dc.authorid0000-0002-2969-0039
dc.contributor.authorSarıtekin, Namık Kemal
dc.contributor.authorZalaoğlu, Yusuf
dc.contributor.authorYıldırım, Gürcan
dc.contributor.authorDoğruer, Musa
dc.contributor.authorTerzioğlu, Cabir
dc.contributor.authorVarilci, Ahmet
dc.contributor.authorGörür, Osman
dc.date.accessioned2021-06-23T19:35:25Z
dc.date.available2021-06-23T19:35:25Z
dc.date.issued2014
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Fizik Bölümüen_US
dc.description.abstractThis comprehensive study reports the effect of the Ho inclusions on the microstructural, electrical, mechanical and superconducting characteristics of YBa2Cu3O7-delta ceramic superconductors with the aid of standard characterization methods including the bulk density, dc resistivity (rho-T), transport critical current density (J(c)), X-ray diffraction (XRD), electron dispersive X-ray (EDX), scanning electron microscopy (SEM) and Vickers microhardness (H-V) investigations. The experimental results such as the degree of granularity, hole (filling) localization effect, room temperature resistivity, onset-offset critical transition temperature, degree of the broadening, thermodynamic fluctuations (spin-gap opening temperature), crystallinity, crystal plane alignments (texturing), crystal structure, grain size, phase purity and lattice parameters, appearance of flux pinning centers, grain boundary weak-links (interaction between the superconducting grains), surface morphologies (grain size distribution), real (load independent) microhardness values, elemental compositions and distributions belonging to the pure and Y-site Ho substituted Y-123 superconducting samples are discussed in detail for the first time. Moreover, mechanical characterization enables us to theoretically determine the elastic (Young's) modulus and yield strength being in charge of the potential mechanical applications. Additionally, the load dependent microhardness values of the Y-site Ho substituted Y-123 materials, have not been modeled by the available theoretical methods (Hays-Kendall and indentation-induced cracking approach) up to the present. All the experimental findings show that the microstructural, electrical, mechanical and superconducting properties improve regularly with the increment in the Ho concentration level at the Y-site in the superconducting matrix until a certain value of x = 0.100 (optimum) beyond which the characteristics tend to retrograde rapidly. This is attributed to the fact that excess (0.100 < x) penetration of the homovalent Ho-sites on the Y-sites damages the crucial properties given above. In other words, from the Ho content level of x = 0.100 onwards in the Y-123 matrix, the oxygen content in the Cu-O chains begins to increase considerably and new induced oxygen atoms reorder the unit cell structure (rapid increment of the a axis length), so the structural phase transits from the orthorhombic to pseudotetragonal, being one of the most striking points deduced from this paper. Another vital discussion relies on the fact that the degradation of the mobile hole concentration (hole localization effect) in the Cu-sites leads to transition from optimally doped to the underdoped position in the crystal structure. Besides, the rapid degradation in the mechanical properties due to the increase of the specimen cracking/porosity, grain boundary weak-links and irregular grain orientation distribution confirms the relationships between the microstructure and mechanical properties of the Y-123 superconducting materials. Furthermore, all the samples exhibit the typical Reverse Indentation Size Effect (RISE) behavior under the applied indentation test load. As for the theoretical modeling of the hardness evidences, the calculations performed by IIC model are quite closer to the values of the plateau region as compared to those of HK approach. Based on the results, the IIC model is found to be superior to HK approach for the description of the real microhardness values belonging to all the superconducting samples. (C) 2014 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.jallcom.2014.04.037
dc.identifier.endpage371en_US
dc.identifier.issn0925-8388
dc.identifier.issn1873-4669
dc.identifier.scopus2-s2.0-84901758574en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage361en_US
dc.identifier.urihttps://doi.org/10.1016/j.jallcom.2014.04.037
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7787
dc.identifier.volume610en_US
dc.identifier.wosWOS:000338811100057en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorSarıtekin, Namık Kemal
dc.institutionauthorZalaoğlu, Yusuf
dc.institutionauthorYıldırım, Gürcan
dc.institutionauthorDoğruer, Musa
dc.institutionauthorTerzioğlu, Cabir
dc.institutionauthorVarilci, Ahmet
dc.institutionauthorGörür, Osman
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.subjectX-ray Diffractionen_US
dc.subjectElectron Microscopyen_US
dc.subjectCeramicsen_US
dc.subjectHardness Measurementen_US
dc.subjectMechanical Characterizationen_US
dc.subjectGrain Boundariesen_US
dc.titleDetermination of solid solubility level of Ho nanoparticles in Y-123 superconducting matrix and strong Cu-1 site preference of nanoparticlesen_US
dc.typeArticleen_US

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