Bi0.67 O1.33 Pb0.33 Sillen L, Aurivillius B Zeitschrift fur Kristallographie 101 (1939) 483-495 Oxide phases with a defect oxygen lattice _cod_database_code 1010020 _database_code_amcsd 0016959 4.05 4.05 4.9 90 90 90 P4/nmm atom x y z occ Pb1 0 .5 .22 .33 Bi1 0 .5 .22 .67 O1 0 0 0 .67 O2 0 .5 .66 .67