Corundum Diffraction data computed using the structure from the paper listed below, along with the cell parameters refined from the powder pattern of R040096 Kirfel A, Eichhorn K Acta Crystallographica A46 (1990) 271-284 Accurate structure analysis with synchrotron radiation. The electron density in Al2O3 and Cu2O Locality: synthetic CELL PARAMETERS: 4.7602 4.7602 12.9946 90.000 90.000 120.000 SPACE GROUP: R-3c ATOM X Y Z OCCUPANCY ISO(B) Al 0.00000 0.00000 0.35218 1.000 0.209 O 0.30625 0.00000 0.25000 1.000 0.253 X-RAY WAVELENGTH: 1.541838 BOUNDS ON TWO THETA: 5.0 90.0 LIMITS IMPOSED ON THE INDICES ARE: +/- 3 +/- 3 +/- 11 MAX. ABS. INTENSITY / VOLUME**2: 12.26622783 The INTENSITY cut off value is 1.00 2-THETA INTENSITY D-SPACING H K L 25.59 61.70 3.4809 0 1 2 35.17 96.57 2.5516 1 0 4 37.80 44.52 2.3801 1 1 0 43.38 99.79 2.0859 1 1 3 46.21 1.45 1.9647 2 0 2 52.58 50.08 1.7404 0 2 4 57.54 100.00 1.6018 1 1 6 59.78 2.60 1.5470 2 1 1 61.17 3.30 1.5152 1 2 2 61.34 7.62 1.5112 0 1 8 66.56 39.73 1.4049 2 1 4 68.25 61.43 1.3741 3 0 0 70.46 1.31 1.3364 1 2 5 74.35 1.53 1.2758 2 0 8 76.93 17.78 1.2393 1 0 10 77.29 9.61 1.2345 1 1 9 80.75 2.30 1.1900 2 2 0 84.41 1.92 1.1475 2 2 3 86.41 1.40 1.1261 3 1 2 86.57 3.02 1.1244 1 2 8 89.07 8.40 1.0992 0 2 10 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.