Title :
Microstructure and superconducting properties of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ coatings by plasma spraying
Author :
Harada, N. ; Kameyama, T. ; Kawano, H. ; Kuroda, K. ; Osaki, K. ; Tada, N.
Author_Institution :
Dept. of Electr. & Electron. Eng., Yamaguchi Univ., Ube, Japan
fDate :
6/1/1997 12:00:00 AM
Abstract :
Superconducting coatings of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ were prepared on silver substrates by an atmospheric plasma spraying. The size of Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ powders to be used the spraying was 30/spl sim/75 /spl mu/m. The coating samples were 30 mm long and 5 mm wide. The coatings in the thickness range 50/spl sim/100 /spl mu/m was obtained. After annealing at 880/spl sim/845/spl deg/C for 20 hours in the atmosphere, the coatings showed superconductivity at liquid nitrogen temperature. The microstructures of the coatings were analyzed by using X-ray diffractometer and observed by scanning electron microscopy. The superconducting properties of the coatings were discussed on the result of critical current density and AC susceptibility measurements.
Keywords :
X-ray diffraction; annealing; bismuth compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; high-temperature superconductors; magnetic susceptibility; plasma arc spraying; powder technology; scanning electron microscopy; strontium compounds; superconducting thin films; superconducting transition temperature; 20 h; 30 mm; 30 to 75 mum; 5 mm; 880 to 845 C; AC susceptibility; Ag; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ coatings; X-ray diffractometry; annealing; atmospheric plasma spraying; coating samples; critical current density; liquid nitrogen temperature; microstructure; microstructures; plasma spraying; powders; scanning electron microscopy; silver substrates; size; superconducting coatings; superconducting properties; Annealing; Atmosphere; Bismuth; Coatings; Microstructure; Powders; Silver; Strontium; Superconductivity; Thermal spraying;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
