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 = 1123 K _database_code_amcsd 0001407 8.13991 8.13991 8.13991 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Biso Mg .125 .125 .125 .71 1.04 Al .125 .125 .125 .29 1.04 Al .5 .5 .5 .85 1.36 Mg .5 .5 .5 .15 1.36 O .26180 .26180 .26180 1.21