Influence of low temperature–low oxygen pressure post-annealing on critical current density of Bi(Pb)2223/Ag superconductors

Deng, Hua; Hua, Peiwen; Wang, Wenquan; Dong, C.; Chen, Hong; Wu, Fei; Wang, Xiaohua; Zhou, Yunfeng; Yuan, Guansen

doi:10.1016/s0921-4534(00)00326-9

Cited by 17 publications

(4 citation statements)

References 31 publications

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“…Also, the volume fraction of Bi-2201 phase decreases from 10% (S1 sample) to 6% (S88 sample). Since these secondary phases reside in the grain boundaries and act as weak links in the Bi-2223 system, 10,12) decreasing of volume fraction of these phases, promotes the intergranular critical current density and reduces the weak link network of these polycrystalline samples. Also the SEM micrographs show that by decreasing precursor powder size, grain size increases after sintering.…”

Section: Characterization Of Sintered Samplesmentioning

confidence: 99%

“…10,11) Our previous results show that the Bi-2212 phase exists within the grain boundaries and plays a role of weak links. 11) Deng et al 12) also observed, using scanning electron microscopy, that the residual Bi-2212 phase is situated at the grain boundaries of Bi-2223 phase and decreases the critical current density. Since the discovery of Bi-2223 superconductor, great progress has been achieved in enhancing the Bi-2223 phase fraction in this system.…”

Section: Introductionmentioning

confidence: 97%

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The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors

Abdolhosseini¹,

Kameli²,

Salamati³

2008

jjap

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We have studied the effect of precursor powder size on the microstructure and intergranular behavior of polycrystalline (Bi,Pb)2Sr2Ca2Cu3Oy (Bi-2223) superconductors, using the X-ray powder diffraction (XRD), scanning electron microscope (SEM), electrical resistivity, and AC susceptibility techniques. Polycrystalline Bi-2223 superconductors were prepared from the powders with different milling times. The XRD results show that by decreasing precursor powder size, the Bi-2223 phase fraction increases in sintered samples. It was found that the grain size and grain connectivity improved by decreasing precursor powder size. The analysis of temperature dependence of AC susceptibility near the transition temperature (Tc) indicates that, by decreasing the precursor powder size in the Bi-2223 system, the intergranular critical current density increases. We have estimated the effective volume fraction of the grains in the framework of the Critical State Model based on our experimental results. This estimation shows, the effective volume of the grains increases by decreasing precursor powder size.

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Section: Characterization Of Sintered Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors

Abdolhosseini¹,

Kameli²,

Salamati³

2008

jjap

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“…No more than 15% of residual secondary phase Bi2212 has been detected in our compacted Bi2223 samples by x-ray diffraction studies. Note, that the residual Bi2212 phase localizes, mainly, at grain boundaries of the Bi2223 phase [18].…”

Section: Methods Of Preparation and Samplesmentioning

confidence: 99%

Percolation transitions in d-wave superconductor–half-metallic ferromagnet nanocomposites

Krivoruchko

Tarenkov

2019

Low Temperature Physics

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Electrical transport properties of random binary networks composed of high-T c superconductor Bi 2 Sr 2 Ca 2 Cu 3 O 6+x microparticles and half-metallic ferromagnet La 0.67 Sr 0.33 MnO 3 (LSMO) nanoparticles have been investigated. Two resistive percolation transitions (superconductor-metal-semiconductor) have been observed for the nanocomposites with a volume fraction of the LSMO no more than 30%. The nanocomposites basic attributes (transition critical temperatures, current-voltage characteristics, percolation threshold, etc.), most probably, cannot be quantitatively interpreted within the framework of a conventional percolation model. We have explained the observed behavior by a two-level scale interaction in the system caused by (i) a significant geometric disparity between the constituent components and (ii) proximity-induced superconducting state of the half-metallic manganite.

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“…It has been believed that, in this case, the number of related phases (2212, 2201, Ca 2 PbO 4 , etc.) is reduced [3], contacts between crys tallites are improved, and the critical current increases [4,5]. According to Zhang et al [6], during annealing at a low oxygen content, particles of the Ca 2 PbO 4 phase either are not formed at all or dissolve because of the decrease in the oxidation number of Pb from 4+ to 2+, and the Pb 2+ ions are incorporated into the 2223 matrix, where they occupy the Bi positions.…”

Section: Introductionmentioning

confidence: 99%

Oxygen atomic displacement waves in the lattice of the Bi,Pb-2223 phase composite annealed in an atmosphere with a low oxygen (O2 + N2) content

et al. 2012

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After annealing of Bi,Pb 2223/Ag composites in a nitrogen-oxygen atmosphere with a low oxy gen content in the 2223 phase, cross polarized waves of oxygen atomic displacements have been revealed by electron diffraction in the [010] 2223 direction. It has been demonstrated using the methods of X ray photo electron spectroscopy and nuclear microanalysis that nitrogen does not interact with the 2223 lattice and that the oxygen index (9.67 ± 0.20) becomes less than the stoichiometric index (x = 10). It has been found that the generation of atomic displacement waves is due to the deficiency of oxygen in the double Bi-O layers.

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Influence of low temperature–low oxygen pressure post-annealing on critical current density of Bi(Pb)2223/Ag superconductors

Cited by 17 publications

References 31 publications

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors

Percolation transitions in d-wave superconductor–half-metallic ferromagnet nanocomposites

Oxygen atomic displacement waves in the lattice of the Bi,Pb-2223 phase composite annealed in an atmosphere with a low oxygen (O2 + N2) content

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Influence of low temperature–low oxygen pressure post-annealing on critical current density of Bi(Pb)2223/Ag superconductors

Cited by 17 publications

References 31 publications

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)2Sr2Ca2Cu3Oy Superconductors

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)2Sr2Ca2Cu3Oy Superconductors

Percolation transitions in d-wave superconductor–half-metallic ferromagnet nanocomposites

Oxygen atomic displacement waves in the lattice of the Bi,Pb-2223 phase composite annealed in an atmosphere with a low oxygen (O2 + N2) content

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Product

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The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors

The Effect of Precursor Powder Size on the Microstructure and Intergranular Properties of (Bi,Pb)₂Sr₂Ca₂Cu₃O_y Superconductors