Citation: Kazakov, S M; Chaillout, C; Bordet, P; Capponi, J J; Nunez-Regueiro, M; Rysak, A; Tholence, J L; Radaelli, P G; Putilin, S N; Antipov, E V (1997). Discovery of a second family of bismuth-oxide-based superconductors. Nature (London), 390, pp. 148-150.
Formula: Bi K0.56 O3 Sr0.44
Chemical name:Strontium potassium bismuth oxide (0.44/0.56/1/3)