Bi0.5 Cu Hg0.5 La0.5 O5 Sr1.5 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 1001760 _database_code_amcsd 0015076 3.7769 3.7769 8.8252 90 90 90 P4/mmm atom x y z occ Hg1 0 0 0 .5 Bi1 0 0 0 .5 Sr1 .5 .5 .2929 .75 La1 .5 .5 .2929 .25 Cu1 0 0 .5 O1 .5 0 .5 O2 0 0 .2280 O3 .301 .5 0 .10 O4 .385 .385 0 .15