Orthorhombic YBCO-123 ceramic oxide superconductor: Structural, resistive and thermal properties

Harabor, A.; Rotaru, P.; Harabor, N. A.; Nozar, P.; Rotaru, Andrei

doi:10.1016/j.ceramint.2018.07.272

Cited by 25 publications

(5 citation statements)

References 56 publications

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“…The DSC showed a major endothermic event centered at ~230 o C with a ~15% mass loss due to melting and evaporation of polymer. As demonstrated before, three more exothermic events are observed in the DSC, corresponding to 300, 400, and 450 o C with a total mass loss of ~30% showing complete removal of polymers [10,22]. An exothermic event and correspondingly a slight change in mass of the sample were observed between 700 °C and 850 °C, which is assigned to the crystallization of YBCO and oxygenation of the samples.…”

Section: Resultssupporting

confidence: 63%

Effect of Processing Parameters on the Morphology, Particulate, and Superconducting Properties of Electrospun YBCO Nanostructures

Jasim

Jusoh

Kamarudin

et al. 2020

JNanoR

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Superconductivity in nanostructured ceramics offers significant advantages over the conventional coarse-grained materials in view of miniaturization of superconducting electronic devices. In this paper, we report the formation of four morphologies of superconducting YBa2Cu3O7-δ (YBCO) nanostructures by electrospinning technique using polymeric polyvinyl pyrrolidone (PVP) solutions of different molecular weight and altering the total content of the metallic precursors. The morphologies prepared using this strategy are nanorods (NRs), nanogarlands (NGs), nanohierarchical (NH), and nanoparticles (NPs). Alternating current susceptibility measurements showed high critical temperatures (TC ~90 K) for the NH YBCO synthesized using PVP of the lowest molecular weight; whereas the YBCO NRs synthesized using a higher molecular weight polymer showed the lowest TC (82 K). A relationship between the particulate properties and TC was also observed – the lower is the pore size the higher is the TC. The YBCO NGs showed the highest specific surface area (7.06 m2/g) with intermediate TC (88 K). Electrospinning process appears an effective and controllable technique to produce different nanomorphologies with intrinsic properties suitable for practical applications.

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Section: Resultssupporting

confidence: 63%

Effect of Processing Parameters on the Morphology, Particulate, and Superconducting Properties of Electrospun YBCO Nanostructures

Jasim

Jusoh

Kamarudin

et al. 2020

JNanoR

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show abstract

“…In order to test the system, two superconducting (YBCO-123) samples were used: a disk-shaped sintered sample (S) with a diameter of 10 mm and thickness 4 mm, and a rectangular melt textured growth sample (MTG) with dimensions 1,4 × 1,0 × 0,2 cm 3 . The X-ray diffraction patterns for both samples present the characteristic peaks and intensity relations of the YBCO-123 superconducting phase [29,30]. Other superconducting and non-superconducting phases were not detected within the experimental sensitivity.…”

Section: Resultsmentioning

confidence: 83%

Levitation and Suspension Forces Measurement System for High Tc Superconductors

Rojas

Arias

Mariño

2020

Momento

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The interaction forces, attraction (suspension) and repulsion (levitation) between a permanent magnet and different bulk Yttrium-based superconductors were carried out with an automatic system developed in our group, which is reproducible, reliable and low cost. Two superconducting samples of YBa 2 Cu 3 O 7−δ (YBCO) prepared by solid-state reaction method (S) and by the melt-textured growth method (MTG) were used. Both samples were characterized by XRD technique and presented the characteristic peaks and intensity relations of the YBCO-123 superconducting phase. Oxygen deficiencies δ > 0,15 and δ < 0,10 for the S and MTG samples respectively, were observed. Both samples displayed different hysteresis behavior in the Force (F ) vs. Distance (z) measurements when they were field cooled (FC) and zero field cooled (ZFC). This behavior agrees with hysteresis loops observed in magnetization measurements. Both levitation and suspension phenomena were observed in the MTG sample with large hysteresis loops of the force. On the contrary, the S sample with small hysteresis loops did not show a suspension force, only displayed a slight levitation force.

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“…Figure 5 shows the X-ray Rietveld refinement. It is noticeable a preferential growth of the sample along the c -axis, corresponding to the (001) planes [43,44]. The Oxygen contents in both samples were obtained from the lattice parameters [45][46][47].…”

Section: Resultsmentioning

confidence: 99%

Attraction and repulsion forces in melt-textured and sintered YBCO-superconductors: a comparative study

Arias-Arana

Rojas-Zambrano

Mariño-Camargo

2020

redin

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In this paper, we measure the attraction (suspension) and repulsion (levitation) forces produced by the interaction between a permanent magnet and different bulk superconductors. The measurements of the interaction force HTS-PM were carried out with a relatively simple technique developed by us, which is reproducible, reliable and low cost. The obtained results were analyzed with the Bean’s critical-state model assuming a uniform magnetic field applied to the superconductor. Two superconducting samples of YBa2Cu3O7-δ (YBCO) prepared by solid-state reaction method and by the melt-textured growth method (MTG) were used. Both samples presented a different hysteresis behaviour in the field cooling (FC) and zero field cooling (ZFC) regimes. Levitation and suspension phenomena were observed in the MTG sample; however, the sintered sample (S) with Oxygen deficiencies (δ > 0.15) displayed a slight levitation force but did not show a suspension force, the latter one attributed to a more efficient magnetic flux pinning. Additionally, the critical current density of both samples was determined from the maximum gap of the force (ΔF) in the FC regime. The obtained values were between 43.00 A/cm2 and 2,758 A/cm2 for the sintered and MTG samples, respectively. These values show a remarkable difference between sintered and MTG samples like that observed from magnetization measurements, which indicate that attraction and repulsion force measurements could provide a rapid and reliable characterization method of polycrystalline superconducting samples.

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Orthorhombic YBCO-123 ceramic oxide superconductor: Structural, resistive and thermal properties

Cited by 25 publications

References 56 publications

Effect of Processing Parameters on the Morphology, Particulate, and Superconducting Properties of Electrospun YBCO Nanostructures

Effect of Processing Parameters on the Morphology, Particulate, and Superconducting Properties of Electrospun YBCO Nanostructures

Levitation and Suspension Forces Measurement System for High Tc Superconductors

Attraction and repulsion forces in melt-textured and sintered YBCO-superconductors: a comparative study

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