Partial Substitution of Cadmium in the Bi₂Sr₂Ca₁Cu₂O_y System

Abstract

The effect of Cadmium (Cd) substitution on the 2212 phase of the Bi-Sr-Ca-Cu-O superconducting system has been studied. The zero resistivity temperature, T_c (offset) initially increased with increasing Cadmium content. However, there exist an optimum amount of Cadmium doping that can be introduced into the system. Once this level is reached, further addition of Cadmium (Cd) causes a decrease in the transition temperature. This is due to the formation of the 2201 phase and other impurity phases. Electrical resistance measurements showed a maximum, T_c (offset), at 90.7K for the sample with nominal composition Bi_1.4 Cd_0.6 Sr_2.0 Ca_1.0 Cu_2.0O_y.