Cu2 Hg0.3 O10 Pb0.7 Sr4 Martin C, Hervieu M, Huve M, Michel C, Maignan A, Van Tendeloo G, Raveau B Physica C 222 (1994) 19-26 Lead-mercury-based superconductors. The 1212 cuprate Pb0.7Hg0.3Sr2+x Ca0.7Nd0.3-xCu2O7-d and the new oxycarbonate Pb0.7Hg0.3Sr4Cu2(CO3)O7 _cod_database_code 1001632 _database_code_amcsd 0015063 3.8242 3.8242 16.46809 90 90 90 P4/mmm atom x y z occ Pb1 .069 0 0 .175 Hg1 .069 0 0 .075 Sr1 .5 .5 .1583 Sr2 .5 .5 .3733 Cu1 0 0 .2631 C1 0 0 .5 O1 .5 .5 0 O2 0 0 .123 O3 .5 0 .270 O4 .153 0 .428 .25 O5 .332 0 .5 .25