Low temperature phase formation of Tl-based superconducting thin films in reduced oxygen atmosphere

Author

Wu, C.Y. ; Foong, F. ; Liou, S.H. ; Ho, J.C.

Author_Institution

Center for Mater. Res. & Anal., Nebraska Univ., Lincoln, NE, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1205

Lastpage

1207

Abstract

Tl-Ba-Cu-Cu-O superconducting thin films were prepared by magnetron sputtering with postannealing in a reduced oxygen atmosphere. Single-phase Tl/sub 2/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ can form on the MgO substrate at 800 degrees C under P(O/sub 2/) approximately=0.1 atm. However, the phase formation temperature can be affected by the starting composition of the film. Tl/sub 1/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ phase can be formed by simply lowering the Tl/sub 2/O pressure. The thermal stability of Tl/sub 1/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ phase was studied by resistivity measurements at high temperatures.<>

Keywords

X-ray diffraction examination of materials; annealing; barium compounds; calcium compounds; ceramics; high-temperature superconductors; sputtered coatings; superconducting thin films; thallium compounds; 800 degC; HTSC; MgO substrate; Tl-based superconducting thin films; Tl/sub 1/Ba/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/; XRD; magnetron sputtering; postannealing; reduced O/sub 2/ environment; resistivity measurements; thermal stability; Atmosphere; Conductivity measurement; High temperature superconductors; Sputtering; Substrates; Superconducting magnets; Superconducting thin films; Temperature measurement; Thermal resistance; Thermal stability;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233335

Filename

233335