Corundum
Lutterotti L, Scardi P
Journal of Applied Crystallography 23 (1990) 246-252
Simultaneous structure and size-strain refinement by the Rietveld method
_cod_database_code 1000032
_database_code_amcsd 0012859
4.76050 4.76050 12.9956 90 90 120 R-3c
atom      x y      z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Al        0 0 .35216  .0022  .0022  .0012  .0011      0      0
O    .30668 0    .25  .0021  .0034  .0019  .0017 .00035  .0007