INFLUENCE OF CALCINING TEMPERATURE ON CRITICAL-CURRENT DENSITY OF AG BI2223 TAPES/

The influence of calcining temperature on critical current density (J( c)) of Ag/Bi2223 tapes has been investigated as a preparing condition for the powder-in-tube method. When the oxide powder was calcined at t emperatures between 973 and 1033 K, the dominant phase constituting th e calcined powder was Bi3.0Sr2.3Ca3.2Cu1.5Ox (3430ss). However, it was 2212 phase when the powder was calcined at temperatures between 1043 and 1093 K. The highest values of J(c) were achieved with tapes prepar ed using the powder calcined at 1013-1033 K. This is attributable to t he fact that the formation rate of the 2223 phase becomes faster in th is temperature range and its volume fraction is maximized. (C) 1997 El sevier Science B.V.