Title :
Microfilamentary conductor based on Bi(2212)
Author :
Miller, T.A. ; Schwartzkopf, L.A. ; Ostenson, J.E. ; Finnemore, D.K. ; Righi, J. ; Gleixner, R.A. ; Zeigler, D.
Author_Institution :
Iowa State Univ., Ames, IA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
A series of ex situ prepared microfilamentary conductors has been prepared to determine the optimum heat treatment sequence for the development of a strain-tolerant microfilamentary conductor based on Bi 2Sr2Ca1Cu2O8-δ . Both monolithic tapes and the microfilamentary composites were prepared so that the difference between the two methods for the same heat treatment could be evaluated. The monolithic tapes are easy to fabricate and are used to provide a rough guide to the desired degree of melting and the optimum oxygen concentration needed for the highest critical current densities. One of the ex situ microfilamentary composites showed a critical current density of 5000 A/cm2 at 4.2 K while subjected to a strain exceeding 1%
Keywords :
bismuth compounds; calcium compounds; composite superconductors; critical current density (superconductivity); high-temperature superconductors; strontium compounds; Bi2Sr2Ca1Cu2O 8-δ; high temperature superconductor; highest critical current densities; microfilamentary conductors; monolithic tapes; Capacitive sensors; Conductors; Critical current density; Heat treatment; Laboratories; Optimized production technology; Physics; Shape; Temperature; Yarn;
Journal_Title :
Magnetics, IEEE Transactions on
