Title :
Effect of Tl-sources on growth of Tl-Ba-Ca-Cu-O films by diffusion process
Author :
Lin, R.J. ; Kuo, D.H. ; Wu, P.T.
Author_Institution :
Mater. Res. Lab., Ind. Technol. Res. Inst., Hsinchu, Taiwan
fDate :
3/1/1991 12:00:00 AM
Abstract :
Superconducting Tl-Ba-Ca-Cu-O films on (100) MgO substrates have been reproducibly prepared by wrapping Ba1Ca2.5Cu 1.7Ox film and Tl-Ba-Ca-Cu-O bulk in Au foils, which are heated at 900°C for 3 min in flowing oxygen followed by furnace cooling. The Tl-Ba-Ca-Cu-O films grown from the Tl-Ba-Ca-Cu-O bulks with Tl content of 3.5-6.5 mol.% consisted of the mixing phase of Tl2Ba2Ca2Cu3Ox, Tl2Ba2Ca1Cu2Ox, and Tl1Ba2Ca1Cu2Ox. These films have Tc(R=0)=110 K
Keywords :
barium compounds; calcium compounds; high-temperature superconductors; materials preparation; superconducting thin films; superconducting transition temperature; thallium compounds; 110 K; 3 min; 900 degC; Au foil; Ba1Ca2.5Cu1.7Ox film; MgO; Tl-Ba-Ca-Cu-O bulk; Tl-Ba-Ca-Cu-O films; Tl-sources; diffusion process; growth; high temperature superconductor; Amorphous magnetic materials; Cooling; Furnaces; Gold; Magnetic separation; Sputtering; Superconducting films; Superconducting magnets; Temperature; X-ray diffraction;
Journal_Title :
Magnetics, IEEE Transactions on
