PREPARATION OF YBCO AG SUPERCONDUCTING TAPES WITH A HIGH CURRENT-CARRYING CAPACITY BY MOCVD USING A SINGLE SOLUTION SOURCE FROM A SUPERSONIC ATOMIZER/

We report the preparation of YBCO superconducting tapes on polycrystal line Ag substrates by a modified MOCVD technique using a single soluti on source from a supersonic atomizer. The source materials Y(TMHD)(3), Ba(TMHD)(2) and Cu(TMHD)(2) were dissolved in tetrahydrofuran in the required ratios, the solution source was atomized by a supersonic atom izer and was transported with a carrier gas of argon through a thermal vaporizer, and then the growing source gases were immediately led int o a CVD chamber heated at 800-850 degrees C to deposit YBCO layers. Ze ro-resistance temperatures (T-c0) of the YBCO samples obtained were in the range 89-91 K. The best sample has a J(c) value of 2.2 x 10(5) A cm(-2) (78 K, 0 T). The approaches to improvement in the current-carry ing capacity of YBCO superconducting tapes are also discussed in this paper.