Carbon Ownby P D, Yang X, Liu J Journal of the American Ceramic Society 75 (1992) 1876-1883 Calculated X-ray diffraction data for diamond polytypes Note: rhombohedral, 21R structure Note: theoretically calculated structure values _database_code_amcsd 0014071 CELL PARAMETERS: 2.5221 2.5221 43.2450 90.000 90.000 120.000 SPACE GROUP: R-3m X-RAY WAVELENGTH: 1.541838 Cell Volume: 238.227 Density (g/cm3): 3.516 MAX. ABS. INTENSITY / VOLUME**2: 6.359609601 RIR: 0.589 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 41.39 2.07 2.1814 1 0 1 6 41.56 7.67 2.1731 0 1 2 6 42.21 22.50 2.1409 1 0 4 6 42.70 27.68 2.1177 0 1 5 6 43.97 49.48 2.0593 1 0 7 6 43.97 50.52 2.0593 0 0 21 2 44.75 23.30 2.0251 0 1 8 6 46.58 11.01 1.9496 1 0 10 6 47.63 5.83 1.9093 0 1 11 6 69.29 3.41 1.3560 1 0 25 6 71.26 4.81 1.3233 0 1 26 6 75.37 36.90 1.2610 1 1 0 6 75.37 12.05 1.2610 1 0 28 6 77.51 7.08 1.2316 0 1 29 6 81.95 6.23 1.1757 1 0 31 6 84.26 5.27 1.1492 0 1 32 6 89.08 3.04 1.0991 1 0 34 6 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.