Preparation and characterization of Tl-Ba-Ca-Cu-O superconducting films by spray pyrolysis and Tl-diffusion technique
- National Chiao-Tung Univ., Hsinchu (Taiwan, Province of China)
The present work reports that highly c-axis-oriented T1-Ba-Ca-Cu-O superconducting films with zero-resistance temperature up to 112 K were successfully prepared using the spray pyrolysis technique with a subsequent t1-diffusion treatment. The insulating Ba-Ca-Cu-O precursor films (Ba:Ca:Cu = 2:2:3) were made by spray deposition of the related metal nitrate solution on a preheated (300 - 400 C) MgO(001) single-crystal substrate. The presence of the superconducting phases of he resultant films depended strongly on the types of T1 sources used. The results showed that the formation of the superconducting phases could be achieved more readily by using the bulk T1-Ba-Ca-Cu-O rather than T1{sub 2}O{sub 3} as a T1 source. In other words, the low T1 content in the T1BaCaCuO bulk source with a resulting low T1-vapor pressure is favorable for the formation of a higher T{sub c} superconducting phase. The dominant phases in the prepared films were mainly T1Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub y}(1223 phase) and T1{sub 2}Ba{sub 2}CaCu{sub 2}O{sub y} (2212 phase). The critical current density of a film with a nearly single-phase (1223) structure was measured to be 1.2 X 10{sup 4} A/cm{sup 2} at 77 K under zero magnetic field.
- OSTI ID:
- 142232
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 77; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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