Flux Pinning and Properties of Solid-Solution (Y,Nd)1+XBa2-x Cu3O7-delta Superconductors Processed in Air and Partial Oxygen Atmospheres (Preprint)
Abstract
The effect of chemical composition substitutions on the flux pinning and physical properties of (Y,Nd) 1 + (XB(alpha2)-xCu3O7(-gamma)) superconductors was studied in powders processed by solid-state reaction and equilibrated in air at 910 deg C. The powders were subsequently processed in 1% O2 atmosphere at <920 deg C to increased the superconducting transition temperature (T sub c) and critical current density (J sub 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% O2 atmosphere at temperatures <500 deg C to maximize T(sub c). The T(sub cs) of the powders were measured by ac susceptibility and dc magnetization methods. Annealing powders with a final step in 1% O2 atmosphere compared to processing in air significantly enhanced T(sub c) from 65-90 K to >92 K for all compositions tested, and also increased from about 1000 - 100,000 A/sq cm to approximately 10(exp 6) A/sq cm. The flux pinning properties varied depending on exact composition, and the intrinsic behaviors changed with the final 1% O2 annealing treatment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2004
- Accession Number
- ADA460143
Entities
People
- I. Maartense
- J. C. Tolliver
- J. M. Evans
- L. P. Cook
- Paul N. Barnes
- R. D. Shull
- Timothy J. Haugan
- W. Wong-ng
Organizations
- Air Force Research Laboratory