The pinning force density in polycrystalline Bi1.8Pb0.4Sr2Ca2−xYxCu3Oy multiphase systems

Mihalache, V.; Deac, I. G.; Pop, Alexandra; Miu, L.

doi:10.1016/j.cap.2011.01.015

Cited by 17 publications

(8 citation statements)

References 18 publications

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“…While the further increase of x leads to a change in the reaction rate which retards slightly the (Bi,Pb)-2223 formation. A similar behavior was observed in many previous studies, concerning the effect of R 3+ ions on (Bi,Pb)-2223 phase [11][12][13][14].…”

Section: Characterization and Investigationsupporting

confidence: 90%

“…Moreover, for all substituted samples, the lattice parameter a increases slightly with increasing Ho content while the lattice parameter c decreases significantly. Similar behavior has been observed in previous works involving substitution of rare-earth elements at Ca site in the (Bi,Pb)-2223 system [10][11][12][13]43,44]. This behavior can be explained according to two reasons.…”

Section: Characterization and Investigationsupporting

confidence: 86%

“…It is clear that T c enhances as x increases from 0.000 to 0.025 and then it decreases with the further increase in x. The parabolic dependence of T c on x is considered to be a typical character of the substituted high temperature superconductors [11]. This relation indicates that the un-substituted sample lies in the under-doped region [12].…”

Section: Characterization and Investigationmentioning

confidence: 99%

“…The partial substitution of Ca 2+ ions by rare-earth element R 3+ ions on the (Bi,Pb)-2223 phase has a significant effect on its normal and superconducting properties [10]. The previous studies showed that T c values are gradually decreased with the increase of R 3+ content [10][11][12][13][14][15]. The effect of partial substitution of Sm and Eu at Ca site in (Bi,Pb)-2223 system on the superconducting, microstructure, and mechanical properties was studied [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

et al. 2016

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Abstract:The effect of the partial substitution of Ca 2+ by Ho 3+ ions on the electrical and mechanical properties of the superconducting phase (Bi,Pb)-2223 was studied. Superconducting samples of the type (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ were prepared by solid-state reaction technique under ambient pressure, and characterized by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The superconducting transition temperature T c and pseudogap temperature T * were estimated from electrical resistivity measurements, while the critical current density J c was determined from I-V curves. The electrical resistivity data were discussed according to bipolaron model in the absence of thermally excited individual polarons. The sample with x = 0.025 showed the highest phase volume fraction, T c , and J c . Room temperature Vickers microhardness measurements were carried out at different applied loads (0.25-5 N) in order to investigate the performance of the mechanical properties of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ phase. It was found that all the samples exhibit normal indentation size effect (ISE). The Vickers microhardness number H V increased as x increased from 0 to 0.025. The experimental results were discussed in view of Meyer's law, Hays-Kendall (HK) approach, elastic/plastic deformation (EPD) model, and proportional specimen resistance (PSR) model. The load independent (true) microhardness of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ superconducting samples showed identical behavior to that of the PSR model.

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Section: Characterization and Investigationsupporting

confidence: 90%

Section: Characterization and Investigationsupporting

confidence: 86%

Section: Characterization and Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

et al. 2016

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“…The AC susceptibility is widely used as a nondestructive method for the determination and characterization of the intergrain connections in the polycrystalline high temperature superconductors, as well as the flux pinning properties [35][36][37][38]. The temperature dependencies of the real, v 0 , and imaginary, v 00 , components of AC susceptibility for the Bi-2212 bulks with Ca content of x = 0.90, 0.95, 1.00, and 1.05 are measured in AC field of 0.5 Oe with the frequency of 333 Hz and plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Influences of Ca nonstoichiometry on the superconducting properties of Bi-2212 superconducting bulks

Zhang

Hao

et al. 2015

J Mater Sci: Mater Electron

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Polycrystalline bulks of Bi 2 Sr 2 Ca x Cu 2.0 O 8?d (Bi-2212) with x = 0.90, 0.95, 1.00 and 1.05 were fabricated by spark plasma sintering technique. The influences of Ca nonstoichiometry on the microstructures, carrier concentration, as well as the related superconducting properties were systematically investigated. XRD analyses revealed the corresponding change of lattice parameters of Bi-2212 phase with the Ca nonstoichiometry. The average particle radius in the sintered bulks underwent an obvious change with the increase of Ca content, which could be attributed to the variation of thermodynamic properties. AC susceptibility measurements exhibited the optimization of intergrain connections in Ca = 0.95 bulk, which lead to the optimization of both self-and in-field critical current density, J c of this system. The optimization of microstructures also caused the enhancement of surface pinning. Based on the enhancements of both intergrain connections and flux pinning properties, an obvious improvement of critical current density was obtained with the optimal doping content of Ca = 0.95.

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Effect of Nb addition on magnetic, structural and superconducting properties of (Bi, Pb)-2223 superconductors

Bilgili

Kocabaş

2014

J Mater Sci: Mater Electron

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The pinning force density in polycrystalline Bi1.8Pb0.4Sr2Ca2−xYxCu3Oy multiphase systems

Cited by 17 publications

References 18 publications

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Influences of Ca nonstoichiometry on the superconducting properties of Bi-2212 superconducting bulks

Effect of Nb addition on magnetic, structural and superconducting properties of (Bi, Pb)-2223 superconductors

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