Cryolite Yang H, Ghose S, Hatch D M Physics and Chemistry of Minerals 19 (1993) 528-544 Ferroelastic phase transition in cryolite, Na3AlF6, a mixed fluoride perovskite: high temperature single crystal X-ray diffraction study and symmetry analysis of the transition mechanism Sample: T = 900 K _database_code_amcsd 0007750 CELL PARAMETERS: 5.6333 5.6273 7.9619 90.000 90.000 90.000 SPACE GROUP: Immm X-RAY WAVELENGTH: 1.541838 Cell Volume: 252.394 Density (g/cm3): 2.762 MAX. ABS. INTENSITY / VOLUME**2: 4.259513451 RIR: 0.502 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 19.30 17.80 4.5986 1 0 1 4 19.32 33.81 4.5954 0 1 1 4 22.33 59.86 3.9812 1 1 0 4 22.33 24.62 3.9810 0 0 2 2 31.77 29.17 2.8166 2 0 0 2 31.79 100.00 2.8151 1 1 2 8 31.80 31.29 2.8136 0 2 0 2 39.18 3.30 2.2993 2 0 2 4 39.21 2.82 2.2977 0 2 2 4 45.57 28.57 1.9906 2 2 0 4 45.57 13.81 1.9905 0 0 4 2 51.29 1.45 1.7812 3 1 0 4 51.32 1.89 1.7804 2 2 2 8 51.32 2.59 1.7804 1 1 4 8 51.34 1.44 1.7797 1 3 0 4 56.61 6.43 1.6259 3 1 2 8 56.62 3.58 1.6255 2 0 4 4 56.64 3.63 1.6250 0 2 4 4 56.65 6.41 1.6247 1 3 2 8 66.42 3.04 1.4075 2 2 4 8 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.