Title :
Fabrication and post-annealing studies of ultrasonically spray pyrolysed Y-Ba-Cu-O films
Author :
Ferreri, Annarita ; Nelstrop, John A G ; Caplin, Anthony D. ; MacManus-Driscoll, Judith L.
Author_Institution :
Centre for High Temp. Supercond., Imperial Coll. of Sci., Technol. & Med., London, UK
fDate :
3/1/2001 12:00:00 AM
Abstract :
An ultrasonic spray pyrolysis (USP) system has been used to deposit thick films of YBa2Cu3O7-x on (100) LaAlO3. Nitrate precursors with a Y:Ba:Cu ratio of 1:2:0.6 have been used with a deposition temperature of 900°C and annealing temperature of 500°C. Growth rates as high as 1 μm per minute have resulted in epitaxial growth of biaxially aligned (<3°), 3 μm thick YBa2Cu3O7-x films, with typical endpoint Tc of ~86 K and onset Tc of ~91 K and Jc, of >104 A.cm-2 , 1 T, 77 K. It has been previously shown that lower nitrate precursor concentration, and hence decreased growth rate, has resulted in improved superconducting properties. The main objective of this paper is to investigated the effect of deposition temperature and post-annealing on the properties of the superconducting films
Keywords :
annealing; barium compounds; critical current density (superconductivity); high-temperature superconductors; spray coatings; superconducting thin films; superconducting transition temperature; yttrium compounds; (100) LaAlO3; 500 C; 900 C; 91 K; Y-Ba-Cu-O films; YBa23O7; YBa2Cu3O7-x; annealing temperature; deposition temperature; fabrication; growth rates; high temperature superconductor; lower nitrate precursor concentration; post-annealing; superconducting properties; ultrasonically spray pyrolysed film; Annealing; Educational institutions; Epitaxial growth; Fabrication; Spraying; Superconducting epitaxial layers; Superconducting films; Telephony; Temperature; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
