Abstract
TlBaCaCuO (2223) system high-Tc superconductor was prepared, whereupon the partcle size of raw material CuO was changed from several μm to superfine powder 150A. The superconductivity represented by Tc of 122K and Jc of 530A/cm2 was much improved by the use of the superfine CuO powder. In the Bi system same effect of the particle size in CuO was observed. It is suggested from the result of XRD patterns and SEM images that, as the specific surface area of CuO particle is increased, the solid-phase reaction is accelertated inducing efficiently the high-Tc phase (2223) of superconductors.
