Low temperature synthesis of Li and Cl added Bi-2212 superconductors

Low temperature synthesis of Bi2Sr2CaCu2Oy (Bi-2212) bulk superconductors has been achieved by the addition of lithium (Li) and chlorine (Cl). The samples were prepared by a solid-state reaction method. The samples with nominal composition Bi2.12Sr1.90Ca1.02Cu1.96LixClxOy (0 ≤ x ≤ 0.3) were heated in air at temperatures ranged from 700 to 780 °C. The lithium perchlorate (LiClO4) addition (x≥0.05) promotes the formation of the Bi-2212 phase in low temperature synthesis. The Bi-2212 sample (Tc=78K) was obtained for x=0.15 by heating even at 720 °C, which is about 100 °C lower than that of the non-doped 2212 phase.