Fe2 Hg0.4325 O9 Pb0.4325 Sr4 Nguyen N, Daniel P, Groult D, Raveau B, Greneche J Materials Chemistry and Physics 45 (1996) 33-38 New mixed valence iron oxides (Pb, A) Sr4 Fe2 O9-d (A = Cd, Hg) with the 0201 - 1201 intergrowth type structure _cod_database_code 1001752 _database_code_amcsd 0014208 3.8056 3.8056 30.48199 90 90 90 I4/mmm atom x y z occ Pb1 0 0 0 .4325 Hg1 0 0 0 .4325 Sr1 .5 .5 .0837 Sr2 .5 .5 .2062 Fe1 0 0 .1507 O1 .29 .5 0 .25 O2 0 0 .069 O3 .5 0 .1483 O4 0 0 .212