ABSTRACT
Since a new oxide superconductor was discovered for the first time in 1986 [1], many types of superconductor have been discovered up to the present [2-4]. In the interim, many studies have been carried out on how to make wires from Y-series, Bi-series, and Tl-series materials with a critical temperature (Tc) above 77 K. Among these studies, a silver-sheathing technique has been widely used with Bi-series materials [5-7]. Most workers have been concerned with the so-called Bi-2223 phase ( r = 110K)of (Bi,Pb)2Sr2Ca2Cu30 [8-11]. However, the Bi-2212 phase (Tc up to 98 k) of Bi2Sr2CaCu20 is thermodynamically more stable than the Bi-2223 phase, making it easier to form the single phase [12].
