Br H4 N Bartlett G, Langmuir I Journal of the American Chemical Society 43 (1921) 84-91 The crystal structure of the ammonium halides above and below the transition temperature _cod_database_code 1011300 _database_code_amcsd 0018147 3.988 3.988 3.988 90 90 90 Pm3m atom x y z N1 0 0 0 Br1 .5 .5 .5