Bi0.5 Cu2 Hg0.545 O9.72 Sr4 Pelloquin D, Hervieu M, Michel C, Maignan A, Raveau B Physica C 227 (1994) 215-224 A new superconducting oxycarbonate Bi0.5 Hg0.5 Sr4 Cu2 (C O3) O7-d _cod_database_code 1001633 _database_code_amcsd 0015067 3.8265 3.8265 16.4742 90 90 90 P4/mmm atom x y z occ Hg1 0 0 0 .5 Bi1 0 0 0 .5 Sr1 .5 .5 .1579 Sr2 .5 .5 .3714 Cu1 0 0 .2643 C1 0 0 .5 .955 Hg2 0 0 .5 .045 O1 .5 .5 0 .72 O2 0 0 .118 O3 .151 0 .425 .25 O4 .675 0 .5 .25 O5 .5 0 .2721