# Effect of Sb substitution on the superconductivity of $Bi_2 (Ca, Sr)_{n+1} Cu_n O_{4+2}$ (n = 1, 2 and 3) systems

Somasundaram, P and Umarji, AM (1990) Effect of Sb substitution on the superconductivity of $Bi_2 (Ca, Sr)_{n+1} Cu_n O_{4+2}$ (n = 1, 2 and 3) systems. In: Pramana, 35 (4). pp. 369-375.

Effect of incorporation of Sb in place of Bi in the bismuth cuprate superconductors has been examined. The nominal compositions studied are $MCa_{1.5}Sr_{1.5}Cu_2 O_{8+\delta}$, and $MCa_2 Sr_2 Cu_3 O_{10+\delta}$, where $M =Bi_{2-x}Sb_x or Bi_{1.5-x}Sb_xPb_{0.5}$. Different preparative routes such as the ceramic method, the matrix route as well as the melt route were employed to prepare the materials. No indication of either Sb entering the lattice or enhancement of $T_c$ is noted from resistivity, magnetic susceptibility and microwave absorption measurements.