O2 Sr Bernal J, Djatlowa E, Kasarnowsky I, 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 1010114 _database_code_amcsd 0017044 3.55 3.55 6.55 90 90 90 I4/mmm atom x y z Sr1 0 0 0 O1 0 0 .397