Journal ArticleDOI
Enhanced pinning by second-phase precipitates in Sr rich “Bi2Sr2CaCu2O8” ceramics
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TLDR
In this paper, a simple annealing procedure was developed to precipitate Bi 2+ x Sr 2− x CuO 6+ d, Sr 14 Cu 24 O 41− x and Bi 2 Sr 3 O 6 in high-temperature superconducting “Bi 2 Sr 2 CaCu 2 O 8 ” ceramics.Abstract:
From a consideration of the phase equilibrium diagram of the system Bi 2 O 3 SrOCaOCuO, a simple annealing procedure was developed to precipitate Bi 2+ x Sr 2− x CuO 6+ d , Sr 14 Cu 24 O 41− x and Bi 2 Sr 3 O 6 in high-temperature superconducting “Bi 2 Sr 2 CaCu 2 O 8 ” ceramics. The transformation results in a four-fold increase of the critical current density at 0.5 to 1 T, which is believed to reflect the increased pinning properties of these ceramics by second-phase precipitates.read more
Citations
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The effect of substitution of Eu on the critical current density and flux pinning properties of (Bi, Pb)-2212 superconductor
TL;DR: In this article, the critical current density and flux pinning properties of Bi1.6Pb0.5Sr2−xEuxCa1.1Cu2.1Oy samples were studied by powder x-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive xray analysis and superconductivity measurements.
Journal ArticleDOI
Flux pinning properties of Yb substituted (Bi,Pb)-2212 superconductor
TL;DR: In this paper, a systematic study on phase evolution, bulk density, resistivity, TC, JC, and JC-B characteristics of pure and Yb substituted (Bi,Pb)-2212 samples at different cationic sites has been carried out.
Journal ArticleDOI
Effect of adding MgO to bulk Bi2212 melt textured in a high magnetic field
TL;DR: In this paper, the authors show that when a magnetic field is applied during melt processing, the bulk Bi2212 is textured with the c-axis parallel to the field direction, and the addition of MgO induces an improvement in the material properties.
Journal ArticleDOI
Introduction of pinning centres into Bi - (Pb) - Sr - Ca - Cu - O superconductors
TL;DR: In this article, a number of techniques by which effective pinning centers can be introduced to improve flux pinning in Bi - (Pb) - Sr - Ca - Cu - O HTSs are reviewed.
Journal ArticleDOI
Melting Equilibria of the Bi-Sr-Ca-Cu-O (BSCCO) System in Air: The Primary Crystallization Phase Field of the 2212 Phase and the Effect of Silver Addition
TL;DR: In this article, the subsolidus and primary crystallization phase field of the 2212 (Bi:Sr:Ca:Cu) phase in the BSCCO system have been investigated.
References
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Journal ArticleDOI
Two-dimensional vortices in a stack of thin superconducting films: A model for high-temperature superconducting multilayers
TL;DR: It is shown that Josephson coupling can be neglected in the high-temperature superconductors only under very stringent conditions.
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Chemistry of High-Temperature Superconductors
TL;DR: Those oxides that superconduct at the highest temperatures contain copper-oxygen sheets; however, other elements such as bismuth and thallium play a key role in this new class of superconductors.
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Variation of the superconducting properties of Bi2Sr2CaCu2O8+x with oxygen content
TL;DR: In this article, the critical temperature of Bi 2 Sr 2 CaCU 2 O 8+δ (2212) was mapped to the (p, T ) plane for 10 −5 ≤ p ≤ 80 bar (O 2 ) and 300 ≤ T ≤ 840°C.
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THERMAL DEPINNING AND “MELTING” OF THE FLUX-LINE LATTICE IN HIGH-Tc SUPERCONDUCTORS
TL;DR: In this paper, it was argued that the three-dimensional (3D) vortex lattice is thermally entangled and may "melt" in high-Tc superconductors.