Spinel Peterson R C, Lager G A, Hitterman R L American Mineralogist 76 (1991) 1455-1458 A time-of-flight neutron powder diffraction study of MgAl2O4 at temperatures up to 1273 K sample UC, T = 923 K _database_code_amcsd 0001401 8.12508 8.12508 8.12508 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Biso Mg .125 .125 .125 .80 .84 Al .125 .125 .125 .20 .84 Al .5 .5 .5 .90 1.07 Mg .5 .5 .5 .10 1.07 O .26244 .26244 .26244 .94