Fe2 Hg0.3 O9 Pr0.57 Sr4 Boullay P, Domenges B, Groult D, Raveau B Journal of Solid State Chemistry 124 (1996) 1-7 A mercury-based ferrite with a 0201-1201 structure: (Hg, Pr) Sr4 Fe2 O9 _cod_database_code 1001740 _database_code_amcsd 0013892 3.8174 3.8138 30.33899 90 90 90 Immm atom x y z occ Hg1 0 0 0 .30 Pr1 0 0 0 .57 Sr1 .5 .5 .0839 Sr2 .5 .5 .2054 Fe1 0 0 .1476 O1 .19 0 .5 .5 O2 0 0 .071 O3 .5 0 .1412 O4 0 .5 .1412 O5 0 0 .214