Bi K0.56 O3 Sr0.44 Kazakov S, Chaillout C, Bordet P, Capponi J, Nunez-Regueiro M, Rysak A, Tholence J, Radaelli P, Putilin S, Antipov E Nature (London) 390 (1997) 148-150 Discovery of a second family of bismuth-oxide-based superconductors _cod_database_code 1008816 _database_code_amcsd 0016686 5.9416 5.9416 8.4394 90 90 90 I4/mcm atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Sr1 0 .5 .75 .44 K1 0 .5 .75 .56 Bi1 0 0 0 O1 0 0 .25 .033 .033 .009 0 0 0 O2 .2219 .7219 0 .011 .011 .060 0 0 0