Bi0.5 Cu Hg0.5 O4.92 Sr2 Pelloquin D, Michel C, Hervieu M, Studer F, Raveau B Physica C 257 (1996) 195-209 On the crystal structure of the "1201" superconductors Hg0.5Bi0.5Sr2-xLaxCuO5-d _cod_database_code 1001759 _database_code_amcsd 0015075 3.7652 3.7652 8.9428 90 90 90 P4/mmm atom x y z occ Hg1 0 0 0 .5 Bi1 0 0 0 .5 Sr1 .5 .5 .2949 Cu1 0 0 .5 O1 .5 0 .5 .96 O2 0 0 .2256 O3 .257 .5 0 .13 O4 .397 .397 0 .12