“The synthesis and superconductivity of a new type of Bi-1212 phase (Bi, Cd)Sr2(Y, Ca)Cu2Oz”,Y. Qian, K. Tang, P. Yang, Z. Chen, R. Li, G. Zhou, Y. Zhang, N. Wang, Physica C, 209, 516 , 1993. [pdf]
A novel series of Bi-1212 superconducting cuprates (Bi1-xCdx)Sr2(Y1-yCay)Cu2Oz has been discovered in this work. The structure was suggested to be that of (Bi, Cu)Sr2YCu2Oz with Cd2+ ions substituting into the Cu2+ sites in the rock-salt-type (Bi, Cu)O layers. The superconductivity was induced in the as-prepared samples by treatment under oxygen pressure of 10 atm at 800°C with a composition of (Bi0.27Cd0.73)Sr2(Y0.7Ca0.3)Cu2Oz. The zero-resistivity temperature is 26 K.