Title :
Crystallization of Bi2Sr2CaCu2O x superconducting filaments produced by gas-jet fiberization
Author :
Jacobs, K.R. ; Miller, T.A. ; Finnemore, P.K. ; Goldman, A.I. ; Labeau, S.E. ; Righi, J.
Author_Institution :
Iowa State Univ., Ames, IA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
X-ray diffraction and differential thermal analysis techniques have been used to investigate the recrystallization products obtained from various heat treatments of glassy Bi2Sr2CaCu 2Ox filaments produced by the gas-jet fiberization process. In both Pb-doped and Pb-free samples, the 85 K superconducting phase appears after the formation of a disordered Bi2Sr2 Cu2Ox-like intermediate phase at lower temperature. The c-lattice parameter of this phase is substantially smaller than the published values for Bi2Sr2Cu2Ox and increases as the temperature of the heat treatment increases. After heat treatment at 600°C, a Pb-rich second phase is found together with the 2201-like intermediate phase in the Pb-doped material
Keywords :
X-ray diffraction examination of materials; bismuth compounds; calcium compounds; crystallisation; high-temperature superconductors; strontium compounds; thermal analysis; Bi2Sr2CaCu2Ox; X-ray diffraction; c-lattice parameter; differential thermal analysis; gas-jet fiberization; high temperature superconductor; intermediate phase; superconducting filaments; Bismuth; Ceramics; Conductivity; Crystallization; Heat treatment; High temperature superconductors; Strontium; Superconducting materials; Wires; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
