Bi2.22 O4 Sr0.78 Sillen L, Aurivillius B Zeitschrift fur Kristallographie 101 (1939) 483-495 Oxide phases with a defect oxygen lattice _cod_database_code 1010022 _database_code_amcsd 0016961 3.97 3.97 28.59 90 90 120 R-3m atom x y z occ Sr1 0 0 0 .78 Bi1 0 0 0 .22 Bi2 0 0 .226 O1 0 0 .135 .67 O2 0 0 .308 .67 O3 0 0 .413 .67