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 = 2170 K _database_code_amcsd 0009700 4.844 4.844 13.27 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 .3533 2.25 .0299 .0299 .0255 .01495 0 0 O .307 0 .25 2.22 .0282 .0290 .0275 .0145 .0023 .0046