Lime Primak W, Kaufman H, Ward R Journal of the American Chemical Society 70 (1948) 2043-2046 X-Ray diffraction studies of systems involved in the preparation of alkaline earth sulfide and selenide phosphors _cod_database_code 1000044 _database_code_amcsd 0014079 4.799 4.799 4.799 90 90 90 Fm3m atom x y z Ca 0 0 0 O .5 .5 .5