Journal ArticleDOI
Effect of Sm2BaCuO5 addition on the properties of melt processed SmBa2Cu3Oy
N.V.N. Viswanath,T. Rajasekharan,Latika Menon,N. Harish Kumar,S. K. Malik,G.K. Dey,D. D. Upadhyaya +6 more
Abstract:
Melt processing of SmBa 2 Cu 3 O y (Sm-123) is done in argon atmosphere by the solid liquid melt growth (SLMG) route, with increasing concentration of insulating Sm 2 BaCuO 5 (Sm-211) content. The effects of Sm-211 on the microstructure and on the behaviour of current density (J c ) in high magnetic fields, are discussed. It is observed that as the Sm-211 concentration is increased, the morphology of the trapped 211s change from acicular having a high aspect ratio to nearly spherical. The J c increases for low additions of 211, but for high concentrations, the J c drops drastically. The above data is explained on the basis of pinning from the 211 particles and the matrix.read more
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Journal ArticleDOI
High current density in bulk YBa2Cu3Ox superconductor
TL;DR: A liquid phase processing method for the fabrication of bulk YBa2Cu3Ox superconductors with large current carrying capacity has been developed in this paper, where a cooling rate of 1'°C/h in this temperature range has yielded a microstructure with long plate type, thick grains oriented over a wide area.
Journal ArticleDOI
Oxygen-defect flux pinning, anomalous magnetization and intra-grain granularity in YBa 2 Cu 3 0 7–δ
TL;DR: The anomalous magnetization characteristic, intra-grain granularity and the magnitude of the flux pinning in single crystals of YBa2Cu307-δ are intimately linked as mentioned in this paper.
Journal ArticleDOI
Melt-textured growth of polycrystalline YBa2Cu3O7- delta with high transport Jc at 77 K.
Sungho Jin,Thomas Henry Tiefel,Richard Curry Sherwood,R. B. van Dover,M. E. Davis,G. W. Kammlott,R. A. Fastnacht +6 more
TL;DR: The present work demonstrates that problems caused by low critical current densities and significant deterioration in weak magnetic fields can be overcome through proper microstructural control using molten oxide processing.
Journal ArticleDOI
Critical currents and flux creep in melt processed high Tc oxide superconductors
Masato Murakami,Satoshi Gotoh,N. Koshizuka,S. Tanaka,Teruo Matsushita,Shinsaku Kambe,K. Kitazawa +6 more
TL;DR: In this paper, a theoretical estimation of the contribution of 211 precipitates to flux pinning is also presented, and a value of pinning energy, U, comparable to that of conventional superconductors is obtained.
Journal ArticleDOI
Oxygen ordering, phase separation and the 60-K and 90-K plateaus in YBa2Cu3Ox
Robert Beyers,B.T. Ahn,G. Gorman,V. Y. Lee,Stuart S. P. Parkin,M. L. Ramirez,Kevin P. Roche,J. E. Vazquez,Turgut M. Gür,Robert A. Huggins +9 more
TL;DR: In this paper, the authors report on the ordered oxygen structures and superconducting properties of YBa2Cu3Ox samples prepared in precisely controlled oxygen environments using a solid-state ionic technique.
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