Maghemite Greaves C Journal of Solid State Chemistry 49 (1983) 325-333 A powder neutron diffraction investigation of vacancy ordering and covalence in gamma-Fe2O3 Locality: synthetic Sample: T = 4 K _database_code_amcsd 0013508 8.3396 8.3396 8.3220 90 90 90 P4_32_12 atom x y z occ Biso Fe1 .744 .996 .120 .1 Fe2 .620 .620 0 .1 Fe3 .364 .867 -.016 .1 Fe4 .140 .140 0 .333 .1 O1 .615 .869 -.014 .1 O2 .119 .377 -.005 .1 O3 .137 .861 .007 .1 O4 .383 .631 -.003 .1