Ba O2 Bernal J, Djatlowa E, Kasarnowsky P, Reichstein S, Ward A Zeitschrift fur Kristallographie 92 (1935) 344-354 The Structure of Strontium and Barium Peroxides, Sr O2 and Ba O2 _cod_database_code 1010113 _database_code_amcsd 0017043 3.78 3.78 6.77 90 90 90 I4/mmm atom x y z Ba1 0 0 0 O1 0 0 .404