Cu Fe O6 Pb2 Sr2 Rouillon T, Caldes M, Genouel R, Michel C, Hervieu M, Raveau B Journal of Materials Chemistry 5 (1995) 1163-1170 An ordered oxygen deficient K2 Ni F4 structure: Pb2 Sr2 Cu Fe O6 _cod_database_code 1001710 _database_code_amcsd 0013075 5.4604 5.5227 12.2112 90 90 90 Cmmm atom x y z occ Cu1 0 0 0 Pb1 0 .5 .1446 Sr1 0 0 .3569 Fe1 .5 0 .5 O1 .096 .079 .147 .25 O2 0 .5 .332 O3 .25 .25 .5