Cu2 O6.6 Pb0.5 Sr2.5 Y Rouillon T, Provost J, Hervieu M, Groult D, Michel C, Raveau B Journal of Solid State Chemistry 84 (1990) 375-385 The solid solution Pb0.5Sr2.5Y1-xCaxCu2O7-d: Superconductivity and structure _cod_database_code 1001442 _database_code_amcsd 0013674 3.8253 3.8253 11.891 90 90 90 P4/mmm atom x y z occ Pb1 .5 .5 .5 .5 Sr1 .5 .5 .5 .5 Sr2 0 0 .2891 Y1 0 0 0 Cu1 .5 .5 .1391 O1 0 .5 .1235 O2 .5 .5 .308 .8 O3 0 0 .5