Fe2 O8 Pb0.5 Sr3 Tl0.5 Nguyen N, Groult D, Caignaert V, Ducouret A, Raveau B Physica B 228 (1996) 251-260 Neutron diffraction and Mossbauer spectroscopy studies of the mixed valent Tl-1212 ferrite (Tl0.5 Pb0.5) Sr3 Fe2 O8 _cod_database_code 1001757 _database_code_amcsd 0015006 3.81474 3.81474 12.8293 90 90 90 P4/mmm atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Tl1 .0763 0 0 .125 Pb1 0 0 0 .5 Sr1 .5 .5 .5 Sr2 .5 .5 .2004 Fe1 0 0 .3500 O1 .3860 .5 0 .25 O2 0 0 .1559 .016 .016 .024 0 0 0 O3 0 0 .5 O4 0 .5 .3356