Preparation and critical current density of melt-processed YBaCuO thick films and AgPd-sheathed tapes

✍ Scribed by K Fischer; G Leitner; G Fuchs; M Schubert; B Schlobach; A Gladun; C Rodig

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 768 KB
• Volume: 33
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(93)90084-2

✦ Synopsis

Thermal analysis by differential scanning calorimetry (DSC) has shown that melting of YBa2Cu30 x is completed at 1000-1010°C in a nitrogen atmosphere. The N 2 can be exchanged by 02 without solidification of the melt and the solidification starts in 02 below 1000°C in the supercooled melt• Applying such a thermal treatment to YBa2Cu30 x thick films on AgPd20 ribbons a partial alignment of the c axis normal to the large plane of the films can be achieved. The textured films exhibit a strong anisotropy of the critical current density and of the irreversibility field and an improved weak link behaviour compared with that of untextured samples• A maximum J~ value of 1450 A cm -2 at 77 K in zero field was measured• For AgPd-sheathed tapes produced by the 'powder-in-tube' method, sintering in a nitrogen atmosphere before the heat treatment in oxygen results in high values of Jc, up to 5950 A cm-2 (77 K, 0 T).