Flux pinning and properties of solid-solution (Y,Nd) 1+xBa 2-xCu 3O 7-δ superconductors processed in air and partial oxygen atmospheres

T. J. Haugan, J. M. Evans, J. C. Tolliver, I. Maartense, P. N. Barnes, W. Wong-Ng, L. P. Cook, R. D. Shull

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

The effect of chemical composition substitutions on the flux pinning and physical properties of (Y,Nd) 1+xBa 2-xCu 3O 7-δ superconductors was studied in powders processed by solid-state reaction and equilibrated in air at 910°C. The powders were subsequently processed in 1% O 2 atmosphere at < 920°C to increase the superconducting transition temperature (T c) and critical current density (J c). After processing in air, the powders were nearly pure single-phase compositions as determined by X-ray diffraction. Powders were finally annealed in 100% O 2 atmosphere at temperatures < 500°C to maximize T c. The T cs of the powders were measured by ac susceptibility and dc magnetization methods. Annealing powders with a final step in 1% O 2 atmosphere compared to processing in air significantly enhanced T c from 65-90 K to > 92 K for all compositions tested, and also increased J c from about ∼10 3-10 5 A/cm 2 to ∼10 6 A/cm 2. The flux pinning properties varied depending on exact composition, and the intrinsic behaviors changed with the final 1% O 2 annealing treatment.

Original languageEnglish (US)
Title of host publicationFabrication of Long-Length and Bulk High-Temperature Superconductors
EditorsR. Meng, A. Goyal, W. Wong-Ng, K. Matsumoto, H.C. Freyhardt
Pages151-162
Number of pages12
Volume149
StatePublished - Jun 15 2004
EventFabrication of Long-Length and Bulk High-Temperature Superconductors - Nashville, TN., United States
Duration: Apr 27 2003Apr 30 2003

Publication series

NameCeramic Transactions
Volume149

Other

OtherFabrication of Long-Length and Bulk High-Temperature Superconductors
CountryUnited States
CityNashville, TN.
Period4/27/034/30/03

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