Cu2 O10 Pb0.5 Sr4 Tl0.5 Huve M, Michel C, Maignan A, Hervieu M, Martin C, Raveau B Physica C 205 (1993) 219-224 A 70 K superconductor. The oxycarbonate Tl0.5Pb0.5Sr4Cu2(CO3)O7 _cod_database_code 1001579 _database_code_amcsd 0015040 3.8244 3.8244 16.516 90 90 90 P4/mmm atom x y z occ Tl1 .083 0 0 .125 Pb1 .083 0 0 .125 Sr1 .5 .5 .1596 Sr2 .5 .5 .3725 Cu1 0 0 .2654 C1 0 0 .5 O1 .67 .5 0 .25 O2 0 0 .121 O3 .162 0 .414 .25 O4 .316 0 .5 .25 O5 .5 0 .277