INFLUENCE OF SAUSAGING EFFECT ON V-I CHARACTERISTICS OF SILVER-SHEATHED BI-2223 TAPES

The influence of preparation conditions on the V-1 characteristics of silver-sheathed Bi-2223 tapes made by the powder-in-tube method has be en investigated in detail. A variation in oxide layer thickness appear ed periodically along the lengthwise direction of the tape and became more prominent for the more heavily cold-worked tape. This phenomenon is called the sausaging effect, and it was assessed quantitatively by determining two, parameters; the coefficient of variation (COV) and th e correlation period (z1). The n value was found to relate definitely to both COV and z1. A larger COV value resulted in a smaller n value. Strong sausaging caused a significant underestimation of the critical current density.