Metallurgical and Physical Properties of High-Temperature, High-Critical-Field Superconducting Materials.
Abstract
The compositional dependence of T(c) was measured in a system of niobium-based pseudo-binary beta-tungsten systems. In those cases where stoichiometry with respect to niobium could be maintained, T(c) was found to be a monotonic function of composition, suggesting a general rule. However, the critical magnetic field strengths under the same conditions did not scale with T(c) and did in fact sometimes exhibit maxima, proving extrinsic behavior in these materials. A general annealing effect was discovered. The lower-temperature annealing time to reach a given T(c) in quenched specimens could be greatly accelerated by interposing a very short time anneal at somewhat higher temperatures. The high-energy neutron bombardment at room temperature of Nb3Ga, Nb3Al, and Nb3Sn was found to cause 15 K depressions of T(c) which are reversible with short anneals at 750C. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1974
- Accession Number
- AD0778498
Entities
People
- George W. Webb
Organizations
- RCA Corporation