Bi0.5 Ca0.4 Cu2 Hg0.5 Nd0.6 O6.6 Sr2 Pelloquin D, Hervieu M, Michel C, Van Tendeloo G, Maignan A, Raveau B Physica C 216 (1993) 257-263 A 94K Hg-based superconductor with a "1212" structure Hg0.5Bi0.5Sr2Ca1-xRxCu2O6+d (R=Nd,Y,Pr) _cod_database_code 1001574 _database_code_amcsd 0015058 3.8259 3.8259 12.0029 90 90 90 P4/mmm atom x y z occ Hg1 0 0 0 .5 Bi1 0 0 0 .5 Sr1 .5 .5 .2121 Cu1 0 0 .3592 Ca1 .5 .5 .5 .4 Nd1 .5 .5 .5 .6 O1 .5 0 .373 O2 0 0 .167 O3 .5 .5 0 .6