Title :
The fabrication and characterization of high temperature superconducting magnetic shields
Author :
Purpura, J.W. ; Clem, T.R.
Author_Institution :
US Naval Coastal Syst. Center, Panama City, FL, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
Tubes fabricated of polycrystalline YBa2Cu3O 7-x are characterized, and details of the fabrication procedure are discussed. The microstructure of the tubes determined by scanning electron microscopy and X-ray diffractometry is described. Resistive measurements of Tc and ΔT c have been made. The tubes have also been characterized by means of SQUID (superconducting quantum interference device) magnetometry. The temperature dependence of magnetic fields trapped axially in the tubes has been measured and estimates of penetration depth are given. Moreover, measurements of the transverse shielding effectiveness of the tubes have been made and are compared with theoretical predictions. Studies on flux penetration into the tubes are described. Findings from the microstructure studies are correlated with the observed superconductivity properties. The results on the high-temperature materials are compared to results obtained previously on tubes made from conventional superconductors
Keywords :
SQUIDs; barium compounds; high-temperature superconductors; magnetometers; penetration depth (superconductivity); scanning electron microscope examination of materials; superconducting transition temperature; yttrium compounds; SQUID magnetometry; Tc; X-ray diffractometry; YBa2Cu3O7-x; flux penetration; high temperature superconductors; magnetic shields; microstructure; penetration depth; scanning electron microscopy; transverse shielding effectiveness; tubes; Electron tubes; Fabrication; High temperature superconductors; Magnetic field measurement; Magnetic shielding; Microstructure; SQUIDs; Scanning electron microscopy; Superconducting devices; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
