The effect of K-na co-doping on the formation and particle size of Bi-2212 phase

Kır, M. Ebru; Özkurt, Berdan; Aytekin, M. Ersin

doi:10.1016/j.physb.2016.03.016

Cited by 33 publications

(12 citation statements)

References 31 publications

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“…Applied fields (below Hc2) were able to penetrate into BSCCO in forms of vortices (quantized fields). According to the Ampere law, the critical current density (Jc) would be enhanced [11][12][13][14][15]. Unfortunately, the vortices would be acted by the Lorentz force as applying current through sample.…”

Section: Resultsmentioning

confidence: 99%

“…However, the enhanced formation of the Bi-2223 phase was relatively limited, which meant that the co-existence of the Bi-2223 and Bi-2212 still occurred. Disorder defects generated as a result of substitution effects were reported to effectively serve as pinning center to enhance flux pinning properties of HTS [10][11][12][13][14]. In this work, effect of potassium substitution on structural and superconducting properties of the BPSCCO, which had been hoped for improving, was investigated.…”

Section: Introduction mentioning

confidence: 99%

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Effect of K Substitutions on Structural and Superconducting Properties in Bi1.6Pb0.4Sr2-xKxCa2Cu3O10+ Compounds

Duc

An²,

Anh³

et al. 2019

MaP

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Effect of K substitutions on structural and superconducting properties in Bi-Pb-Sr-Ca-Cu-O (BPSCCO) system has been investigated. Bulk Bi1.6Pb0.4Sr2-xKxCa2Cu3O10+d (where x = 0.00; 0.04; 0.08 and 0.1) samples were fabricated by using the solid-state reaction method. Structural properties of the samples were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) measurement. All samples showed co-existence of Bi-2223 and Bi-2212 superconducting phases. Interestingly, a formation of the Bi-2223 was decelerated and that of the Bi-2212 was accelerated with increasing K content (x). Superconducting properties of the samples were characterized by using temperature dependences of resistance and field dependences of magnetization data. Both onset and offset transition temperatures were found to decrease, those were correlated to the decreases in residual resistance ratio (RRR). The 65 K magnetization curves of K- substituted samples were enlarged in comparison with that of the pure one. Enlargements of the magnetization curves were possibly attributed to the appearance of additional point-like defects generated by substitutions of K into Sr site. Keywords: BPSCCO, substitutions, flux pinning, defects.

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Section: Resultsmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Effect of K Substitutions on Structural and Superconducting Properties in Bi1.6Pb0.4Sr2-xKxCa2Cu3O10+ Compounds

Duc

An²,

Anh³

et al. 2019

MaP

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“…Similar results were obtained for the BPSCCO in which alkaline metals and rare-earth elements were substituted. 9,11,14,15) In this paper, the enhancements of J c in Na-substituted Bi 1.6 Pb 0.4 Sr 2 Ca 2¹x Na x Cu 3 O 10+¤ superconductor is reported.…”

Section: Introductionmentioning

confidence: 87%

“…It was observed that the critical current density (J c ) of BSCCO superconductor rapidly decreased in the presence of magnetic fields. 9,11,12) These applications have been shown to be limited because of insufficient flux pinning. The three dimensional (3D) vortices were found to melt into two dimensional (2D) called "pancake" vortices due to weak coupling between the CuO 2 superconducting layers.…”

Section: Introductionmentioning

confidence: 99%

Enhancements of Critical Current Density in the Bi–Pb–Sr–Ca–Cu–O Superconductor by Na Substitution

Tran

Lee

et al. 2018

Mater. Trans.

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In this paper, we investigated the influences of Na substitution on the enhancements of critical current density (J c) in the BiPbSrCaCuO (BPSCCO) superconductors. The Bi 1.6 Pb 0.4 Sr 2 Ca 2¹x Na x Cu 3 O 10+¤ (where x was ranged from 0 to 0.1) polycrystalline samples were fabricated using solid state reaction technique. The zero electrical critical temperature (T c) of Na-substituted BPSCCO samples was found to be slightly higher than that of Na-free BPSCCO one. Magnetization J c data measured at 65 K with field applied parallel to the c-axis of the samples showed that J c of Na-substituted BPSCCO samples were enhanced. Possible reasons for the J c enhancements were attributed to the effective flux pinning by crystal defects at Ca layers generated by Na substitution. Improvements of volume pinning force (F p) in terms of magnitude and position of F pmax were also obtained.

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“…Thus, when alkaline elements are doped into ceramic materials, nucleation and crystal growth can start at lower temperatures, leading to the formation of larger grains. Furthermore, co-doping works of alkaline elements in ceramic superconductors also showed that they had a significant effect on the size of grains [20][21][22][23]. Recently, Na doping in small amounts in Ca 3 Co 4 O 9 has shown that Na provides an important increase in mean grain sizes, decreasing electrical resistivity [24].…”

Section: Introductionmentioning

confidence: 99%

Improving thermoelectric properties of Ca3Co4O9+δ through both Na doping and K addition at optimal values

Özkurt

Aytekin

Madre

et al. 2019

J Mater Sci: Mater Electron

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Ca 2.93 Na 0.07 Co 4 O y /x wt% K 2 CO 3 (x=0.00, 0.01, and 0.03) polycrystalline ceramics were prepared by conventional solid-state method. XRD results have shown that all samples predominantly include Ca 3 Co 4 O 9 phase together with small amounts of secondary phases. SEM images show that all samples have randomly oriented plate-like grains in different sizes. The electrical resistivity measurement showed that electrical properties of Ca 3 Co 4 O 9 ceramics can be improved significantly by both, Na doping and K addition at their optimal values. The effect of dopants on thermoelectric properties of Ca 3 Co 4 O 9 was examined by both, Seebeck coefficient and power factor, being higher in K-added than in the pure samples, indicating that thermoelectric properties of samples are positively affected when alkaline elements enter into their structure.2

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The effect of K-na co-doping on the formation and particle size of Bi-2212 phase

Cited by 33 publications

References 31 publications

Effect of K Substitutions on Structural and Superconducting Properties in Bi1.6Pb0.4Sr2-xKxCa2Cu3O10+ Compounds

Effect of K Substitutions on Structural and Superconducting Properties in Bi1.6Pb0.4Sr2-xKxCa2Cu3O10+ Compounds

Enhancements of Critical Current Density in the Bi–Pb–Sr–Ca–Cu–O Superconductor by Na Substitution

Improving thermoelectric properties of Ca3Co4O9+δ through both Na doping and K addition at optimal values

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