The Effects of Sb Substitution on Structural Properties in YBa2Cu3O7 Superconductors

Akyüz, G. Bilgeç; Kocabaş, Kemal; Yıldız, Aylin; Özyüzer, L.; Çiftçioğlu, Muhsin

doi:10.1007/s10948-011-1180-y

Cited by 12 publications

(5 citation statements)

References 28 publications

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“…1. The zero-resistance temperature of pure YBCO sample is read as 89 K from this graph, which is in agreement with literature [7,8]. Ag substitution does not affect strongly the superconducting properties of YBCO system.…”

Section: Resistivity Measurementsupporting

confidence: 90%

Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

Yıldız

Kocabaş

Akyüz

2012

J Supercond Nov Magn

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The effects of Ag dopants on the superconducting properties of YBCO bulk samples, prepared under solidstate reaction method, have been studied by resistivitytemperature (ρ-T ), X-ray diffraction (XRD), scanning electron microscope (SEM), bulk density, AC susceptibility, DC magnetization measurements, and theoretical analysis. Small Ag substitutions (x ≤ 0.10) do not effect T c of pure YBa 2 Cu 3−x Ag x O 7−δ , while we observed small decreases of 1.5 K for larger doping levels (x ≥ 0.15). AC susceptibility measurements for sintered YBCO pellets have been performed as a function of temperatures at constant frequency and AC field amplitude in the absence of DC bias field. The critical current densities (J c ) have been estimated as a function of magnetic field from the magnetization data employing Bean's critical state model. The increase in Ag amount (x) in YBa 2 Cu 3−x Ag x O 7−δ (x ≥ 0.10) system effectively decreases the intragrain critical current density, which is attributed to the reduced connectivity between the grain boundaries. In the case of small additions (x = 0.05), Ag atoms fill partly the pores, leading better crystallization of the grains.

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Section: Resistivity Measurementsupporting

confidence: 90%

Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

Yıldız

Kocabaş

Akyüz

2012

J Supercond Nov Magn

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“…It can be seen from the table that the values ranged from 6,8 (for the virgin sample) to 8,822 (for the HcN4 compound). It should be noted here that the value initially dropped to a local minimum of 6,684 (for the HcN3 sample) and then increased significantly to 8,822 owing to the significant decrease in the cell parameter c, confirming that the Nd nanoparticles mainly occupied around the Cu1 sites in the crystal structure [21].…”

Section: Whilesupporting

confidence: 50%

“…In the case of the HcN4 compound, some peaks such as 003, 013, 005, 113, 020, 200, 115, 007,123, and 213 disappear immediately while the 116 peaks of the characteristic tetragonal crystal structure appear instantaneously. It is even well known from the literature that in the orthorhombic crystal structure, the split diffraction peaks are high-intensity and low-angle around 47.6° (020 and 200) and 58.3° (123 and 213) at 2teta [21]. Regarding the tetragonal crystal structure, the split peaks given above start to coalesce with each other at low-intensity and high-angle (reversion of values in the angle and intensity).…”

Section: Whilementioning

confidence: 88%

The Successful Incorporation of Nd Into Ba Site of Y0.9Ho0.1Ba2-yNdyCu3O7-δ Bulk Superconductors

Sarıtekin

Uzumcu

2022

J. Mod. Mech. Eng. Technol.

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This inclusive study reports the effect of the Nd atoms on the mechanical, microstructural, electrical and superconducting characteristics of Y0.9Ho0.1Ba2-yNdyCu3O7-δ superconductors with the aid of standard characterization methods, including X-ray diffraction, scanning electron microscopy, the bulk density, dc resistivity, and transport critical current density. The experimental results such as the degree of granularity, hole localization effect, room temperature resistivity, critical transition temperature, degree of the broadening, thermodynamic fluctuations, crystallinity, crystal plane alignments, crystal structure, grain size, phase purity and lattice parameters, the appearance of flux pinning centers, grain boundary weak-links, surface morphologies elemental compositions and distributions belonging to Y-site Ho and Ba-site Nd substituted Y-123 superconducting samples are discussed in detail for the first time. All the experimental findings show that the microstructural, electrical, mechanical and superconducting properties regularly improve with the increment in the HcN (Ho constant+Nd changeble) until a certain value of y=0.100, beyond which the characteristics tend to retrograde rapidly. This is attributed to the fact that excess penetration of the Nd damages the crucial properties given above.

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“…At high concentration of Sb where x = 0.40 and 0.50, T C zero was not achieved anymore. At a higher concentration of Sb where x > 0.30, the superconducting state diminished because of the non-superconducting YBa 2 SbO 6 phase, which has a negative effect on the critical temperature [12]. ∆T of the samples varied with Sb concentration and the largest ∆T was observed at x = 0.30, which is 14 K. Below the optimum concentration of Sb x = 0.15, T C zero and T C onset were not showing obvious changes which indicate that low concentration of Sb has a moderate effect on the conduction mechanism and also acts as the oxygen stabilizer that maintains the orthorhombicity of the structure.…”

Section: Methodsmentioning

confidence: 99%

Effect of Antimony (Sb) Substitution on Ba-Site of Porous Structured YBA2Cu3Oδ Superconductor

Ramli¹,

Hashim²

2018

IJET

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The effect of antimony (Sb) substitution on Ba-site of porous structure YBa 2 Cu 3 O δ (YBCO) superconductor was investigated. Polycrystalline sucrose was used to create the open pores in the structure. A series of sample with a nominal composition of YBa 2-x Sb x Cu 3 O δ where x = 0.05, 0.10, 0.15, 0.20, 0.30, 0.40 and 0.50 were synthesized and characterized using X-ray diffraction (XRD) method, resistivity measurement technique and Scanning Electron Microscopic (SEM) equipment. For porous Sb-doped sample with x ≤ 0.30, the samples showed metallic behavior above onset critical temperature (T C onset ) while semiconducting behavior was shown for x  0.40. The optimum Sb concentration was achieved at x = 0.15, where T C zero is 85 K and critical current (J C ) value measured at 70 K is 2.75 A/cm 2 . T C onset and T C zero of the sample were suppressed towards higher Sb concentration. High level of Sb concentration resulted in the nonsuperconducting sample and Sb was not incorporated properly into YBCO system. Generally, the crystallographic structure with 123 phase remains as orthorhombic. But, for Sb doping at x = 0.30, the sample exhibits tetragonal structure before the presence of 211 phase with the higher Sb concentration. SEM micrograph for porous sample showed the less dense packing with irregular grain shape compared to the standard sample where the small rounded particles grains that can be clearly seen. It can be summarized that the superconducting properties were attributed mainly by the dopants compared to the porous characteristic.

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The Effects of Sb Substitution on Structural Properties in YBa2Cu3O7 Superconductors

Cited by 12 publications

References 28 publications

Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

Dependence of the Structural, Electrical and Magnetic Properties of YBa2Cu3O7−δ Bulk Superconductor on the Ag Doping

The Successful Incorporation of Nd Into Ba Site of Y0.9Ho0.1Ba2-yNdyCu3O7-δ Bulk Superconductors

Effect of Antimony (Sb) Substitution on Ba-Site of Porous Structured YBA2Cu3Oδ Superconductor

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