Title :
Optimization of phase formation and microstructure in Tl-1223 thick films
Author :
Moore, J.C. ; Naylor, M.J. ; Grovenor, C.R.M.
Author_Institution :
Dept. of Mater., Oxford Univ., UK
fDate :
6/1/1999 12:00:00 AM
Abstract :
Tl-1223 films have been fabricated using spray pyrolysis on silver and zirconia substrates. We have investigated the effect of a Tl-2212/TlF source powder and observed a significant increase in melting and, consequently, a reduction of around 20/spl deg/C in the optimum reaction temperature and increased grain growth. We have found that the effect of the fluorine is greatest in the presence of silver. We have also observed that films grown on polycrystalline silver tape have several preferred in-plane orientations.
Keywords :
barium compounds; calcium compounds; grain growth; high-temperature superconductors; spray coating techniques; strontium compounds; texture; thallium compounds; Ag substrates; TlSrBaCa/sub 2/Cu/sub 3/O/sub 9/; grain growth; melting; microstructure; phase formation; preferred in-plane orientations; spray pyrolysis; thick films; zirconia substrates; Fabrication; Microstructure; Powders; Silver; Spraying; Substrates; Superconducting films; Superconducting magnetic energy storage; Temperature; Thick films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
