Ba2 Ca0.24 Cu2.76 Fe0.24 O7.07 Y0.76 Suard E, Caignaert V, Maignan A, Raveau B Physica C 182 (1991) 219-227 The important role of pyramidal copper layers of the 123-structure in superconductivity. The oxides Ba2Y1-xCaxCu3-xFexO7 and Ba2Y1-xCaxCu3-xFexO6 _cod_database_code 1001497 _database_code_amcsd 0015036 3.8263 3.8263 11.6643 90 90 90 Pmmm atom x y z occ Y1 .5 .5 .5 .76 Ca1 .5 .5 .5 .24 Ba1 .5 .5 .1841 Cu1 0 0 0 Cu2 0 0 .3544 .88 Fe1 0 0 .3544 .12 O1 0 .5 .3766 O2 .5 0 .3760 O3 0 0 .1592 O4 .5 0 0 .93 O5 0 .5 0 .14