Journal ArticleDOI
Processing of bulk YBaCuO
TLDR
In this article, the authors summarized processing of bulk YBa2Cu3Ox superconductors with an emphasis placed on the relationship between microstructure and critical currents, and some possible applications of melt processed superconductor in bulk form are also introduced.Abstract:
The author summarizes processing of bulk YBa2Cu3Ox superconductors with an emphasis placed on the relationship between microstructure and critical currents. Sintering is commonly used in ceramic processing but has been unsuccessful in producing high-Jc materials, primarily due to the weak links at grain boundaries. Melt processes have been found to be effective in increasing Jc values through a combination of grain alignment and the introduction of pinning centres. Some possible applications of melt processed superconductors in bulk form are also introduced in this review. Although many attempts have been made to fabricate long conductors, Jc values are still very small for long conductors, while the length is limited for high-Jc materials.read more
Citations
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Journal ArticleDOI
Magneto-optical studies of current distributions in high-Tc superconductors
TL;DR: In this paper, a review of the magneto-optical imaging technique and experiments on thin films, single crystals, polycrystalline bulk ceramics, tapes and melt-textured HTS materials is presented.
Journal ArticleDOI
Processing and properties of large grain (RE)BCO
TL;DR: The potential of high temperature superconductors to generate large magnetic fields and to carry current with low power dissipation at 77 K is particularly attractive for a variety of permanent magnet applications as mentioned in this paper.
Journal ArticleDOI
Bulk high temperature superconductors for magnet applićations
A.M. Campbell,David A. Cardwell +1 more
TL;DR: In this paper, the use of superconductors as permanent magnets is discussed, and a summary of the forces and torques available is given, as well as ways of obtaining maximum repulsion and attraction without demagnetizing the sample.
Journal ArticleDOI
A superconducting joint for GdBa2Cu3O7−δ-coated conductors
TL;DR: Lee et al. as mentioned in this paper solved the problem of how to join two high-temperature superconducting materials together while preserving their electrical and magnetic properties using a multi-step process including partial melting of the conductor and annealing under high-pressure oxygen.
Journal ArticleDOI
Defect formation, distribution and size reduction of in melt-processed YBCO superconductors
Chan-Joong Kim,Gye-Won Hong +1 more
TL;DR: In this article, the effect of addition of Y211 on the sample microstructure, its distribution and refinement by chemical doping are discussed in detail in detail, and the effects of adding Y211 to the Y-Ba-Cu-O material are discussed.
References
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Journal ArticleDOI
Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure
Maw-Kuen Wu,J. R. Ashburn,C. J. Torng,Pei-Herng Hor,R. L. Meng,Li Gao,Z. J. Huang,Yongmei Wang,Ching-Wu Chu +8 more
TL;DR: A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure.
Journal ArticleDOI
A New High-TcOxide Superconductor without a Rare Earth Element
TL;DR: In this paper, a new high-Tc oxide superconductor of the BiSrCa-Cu-O system without any rare earth element was discovered, which has Tc of about 105 K, higher than that of YBa2Cu3O7 by more than 10 K.
Journal ArticleDOI
Superconducting transport properties of grain boundaries in YBa2Cu3O7 bicrystals.
TL;DR: The grain-boundary critical current densities in bicrystal films prepared by evaporation and postannealing and by laser ablation are in good agreement; this result demonstrates that the transport properties are insensitive to preparation technique and, thus, are not dominated by the diffusion of substrate impurities into the boundary region.
Journal ArticleDOI
Flux vortices and transport currents in type II superconductors
A. M. Campbell,J. E. Evetts +1 more
TL;DR: In this paper, the authors considered the effects of lattice rigidity on the summation of pinning forces and showed that a summation based on statistical arguments uses the same approximations and leads to the same results as a dissipation argument.