Cr0.54 Cu2 Hg0.46 O9.88 Sr4 Pelloquin D, Hervieu M, Malo S, Michel C, Maignan A, Raveau B Physica C 246 (1995) 1-10 Two transition-metal-substituted superconducting mercury-based oxycarbonates, Hg(1-x) Mx Sr4 Cu2 (C O3) O(6+d) (M=Cr and Mo) _cod_database_code 1001637 _database_code_amcsd 0015071 3.8747 3.8747 16.15549 90 90 90 P4/mmm atom x y z occ Hg1 0 0 0 .46 Cr1 0 0 0 .54 Sr1 .5 .5 .1579 Sr2 .5 .5 .3720 Cu1 0 0 .2668 C1 0 0 .5 O1 .5 .5 0 .88 O2 0 0 .1205 O3 0 0 .425 O4 .25 .25 .5 .25 O5 .5 0 .2783