Title :
Studies into the phase transformation of Bi-2223 precursor powders using X-ray diffraction and SQUID susceptibility measurements
Author :
Gundakaram, R. ; Chang, S.C. ; Liu, R.S. ; Woodall, L. ; Gerards, M.
Author_Institution :
Mater. Chem. Lab., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
3/1/2001 12:00:00 AM
Abstract :
An optimized processing route for formation of the Bi-2223 phase, from a highly reactive precursor powder, is of obvious importance in achieving a high Jc in powder-in-tube (PIT) tapes, Here, we report the dependence of the SQUID susceptibility signal on the phase content and heat-treatment of the Bi-2223 precursor powders. Magnetic susceptibilities as measured by SQUID reveal differences in the powder quality not seen by x-ray powder diffraction. In particular, Bi-2223 detection is enhanced using SQUID. The rate of phase transformation to the 2223 phase in various precursor powders exhibiting significantly different SQUID signals will be discussed
Keywords :
X-ray diffraction; bismuth compounds; calcium compounds; high-temperature superconductors; magnetic susceptibility; solid-state phase transformations; strontium compounds; Bi-2223 precursor powders; Bi2Sr2Ca2Cu3O10 ; SQUID susceptibility; X-ray diffraction; high temperature superconductor; magnetic susceptibilities; phase transformation; powder quality; powder-in-tube tapes; Biomedical measurements; Bismuth; Heat treatment; Phase measurement; Powders; SQUIDs; Superconducting materials; Superconducting transition temperature; Superconductivity; X-ray diffraction;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
