Corundum Ishizawa N, Miyata T, Minato I, Marumo F, Iwai S Acta Crystallographica B36 (1980) 228-230 A structural investigation of alpha-Al2O3 at 2170 K T = 300 K _database_code_amcsd 0009699 4.754 4.754 12.99 90 90 120 R-3c atom x y z Biso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) Al 0 0 .35228 .32 .0051 .0051 .0019 .00255 0 0 O .3064 0 .25 .33 .0051 .0051 .0025 .00255 .00035 .0007