Sprayed Tl-1223 films: formation kinetics and superconducting properties

Author

Phok, Sovannary ; Galez, Philippe ; Jorda, J.-L. ; Peroz, C. ; Villard, C. ; De-Barros, Dominique ; Weiss, F.

Author_Institution

Univ. de Savoie, Annecy, France

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

2864

Lastpage

2867

Abstract

TlBa₂Ca₂Cu₃O₉ superconducting films, 0.5 to 1 μm in thickness, have been prepared in a two step process. Using a nitrate solution, a precursor layer with composition Ba₂Ca₂Cu₃O_x is first sprayed on a LaAlO₃ heated substrate and then thallinated, following a procedure established for bulk samples. The critical temperature of the films ranges from 108 to 113 K, and the critical current density of the best samples reaches 0.7 MA/cm². The reaction kinetics for the formation of the Tl-1223 phase between 880 °C and 910 °C has been studied for a better control of the grain growth and texture. The effect of fluorine addition on both the microstructure and superconducting properties have been also analyzed.

Keywords

barium compounds; calcium compounds; critical current density (superconductivity); grain growth; high-temperature superconductors; spray coatings; superconducting thin films; superconducting transition temperature; texture; thallium compounds; 0.5 to 1 micron; 108 to 113 K; 880 to 910 degC; Tl-1223 phase; TlBa₂Ca₂Cu₃O₉; critical current density; critical temperature; fluorine addition effects; formation kinetics; grain growth; microstructure; sprayed Tl-1223 films; superconducting properties; texture; two step process; Annealing; Critical current density; High temperature superconductors; Kinetic theory; Magnetic films; Substrates; Superconducting epitaxial layers; Superconducting films; Temperature distribution; Thermal spraying;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812025

Filename

1212219