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http://dx.doi.org/10.9714/psac.2006.8.3.005

Effect of annealing time on MOD-YBCO films at reduced total pressure  

Chung Kook-Chae (한국기계연구원 신기능재료연구본부)
Yoo Jai-Moo (한국기계연구원 신기능재료연구본부)
Ko Jae-Woong (한국기계연구원 신기능재료연구본부)
Kim Young-Kuk (한국기계연구원 신기능재료연구본부)
Publication Information
Progress in Superconductivity and Cryogenics / v.8, no.3, 2006 , pp. 5-8 More about this Journal
Abstract
The effect of annealing time in Metal Organic Deposition(MOD) method was investigated at reduced total pressure. As the total annealing pressure was reduced, the growth rate of YBCO films increased from 0.14nm/sec at atmospheric pressure to 4.2nm/sec at 1 Torr. For the total pres sure of 700, 500, 300, 100, and 1 Torr, the optimal annealing times of 60, 40, 20, 10, 2minutes were found in our experimental conditions. When the an nealing time was short, poor crystallinity or un-reacted phase was obtained. Also, the degradation of YBCO films occurred when exposed longer to the humid ambient at the high annealing temperature. The reduced pressure was found effective to in crease the growth rate and to control the pore size of the YBCO films in MOD method. A fast growth of MOD-YBCO films was realized with high critical current density over $1MA/cm^2$ using reduced pressure annealing. Large pores, usually observed at atmospheric pressure in MOD method, disappeared and also, the number of pores was reduced.
Keywords
MOD; Total pressure; YBCO;
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