Abstract
Tc and phases with Bi-Sr-Ca-Cu-O system were investigated in the substitution of transition elements (IVa, Va and VIa group) and non-trasition elements (IVb and Vb group) for Bi ions. These results are as follows. (1) The high Tc phase disappeared and low Tc phase increased in the substitution of transition elements for Bi ions. (2) The high Tc phase decreased in the substitution of Si and Sn (semiconductor element, IVb group) for Bi ions. (3) The high Tc phase increased in the substitution of Sb, As and P which were the same group of Bi for Bi ions. The substitution of P ions was the most effective and then the high Tc phase was formed in large quantity by replacing Bi ions with 30% of P ions.
