Akermanite Yang H, Hazen R M, Downs R T, Finger L W Physics and Chemistry of Minerals 24 (1997) 510-519 Structural change associated with the incommensurate-normal phase transition in akermanite, Ca2MgSi2O7, at high pressure Sample: P = 2.78 GPa Note: O2-z changed to match reported bond lengths _database_code_amcsd 0008035 CELL PARAMETERS: 7.7677 7.7677 4.9495 90.000 90.000 90.000 SPACE GROUP: P-42_1m X-RAY WAVELENGTH: 1.541838 Cell Volume: 298.639 Density (g/cm3): 3.031 MAX. ABS. INTENSITY / VOLUME**2: 22.88306669 RIR: 2.458 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 16.14 9.73 5.4926 1 1 0 4 17.92 1.02 4.9495 0 0 1 2 21.29 7.35 4.1741 1 0 1 8 22.90 2.79 3.8839 2 0 0 4 24.21 11.62 3.6769 1 1 1 4 25.64 3.89 3.4738 2 1 0 8 29.23 22.42 3.0555 2 0 1 8 31.46 100.00 2.8434 2 1 1 8 32.61 3.77 2.7463 2 2 0 4 36.30 1.50 2.4748 0 0 2 2 36.58 16.54 2.4564 3 1 0 8 37.45 6.09 2.4014 2 2 1 4 38.17 6.09 2.3580 1 0 2 8 39.27 6.97 2.2943 3 0 1 8 39.96 2.64 2.2563 1 1 2 4 41.02 1.65 2.2003 3 1 1 8 44.97 13.33 2.0156 2 1 2 8 45.94 2.78 1.9754 3 2 1 8 46.78 6.32 1.9419 4 0 0 4 48.31 6.52 1.8839 4 1 0 8 49.58 4.22 1.8384 2 2 2 4 49.80 10.25 1.8309 3 3 0 4 51.93 9.58 1.7607 4 1 1 8 52.49 20.71 1.7434 3 1 2 8 52.70 6.27 1.7369 4 2 0 8 53.35 3.42 1.7171 3 3 1 4 56.65 2.24 1.6249 3 2 2 8 58.40 1.66 1.5801 1 1 3 4 61.02 1.37 1.5185 2 0 3 8 62.30 5.02 1.4903 2 1 3 8 63.17 1.43 1.4719 3 3 2 4 63.94 2.51 1.4560 5 1 1 8 65.67 1.05 1.4217 4 2 2 8 66.06 4.87 1.4143 2 2 3 4 67.29 2.91 1.3914 3 0 3 8 67.65 9.58 1.3848 5 2 1 8 68.31 3.12 1.3731 4 4 0 4 71.27 1.63 1.3232 4 4 1 4 71.73 1.46 1.3158 4 3 2 8 73.09 3.39 1.2946 6 0 0 4 76.43 1.56 1.2462 5 2 2 8 76.80 4.30 1.2412 4 1 3 8 77.08 1.35 1.2374 0 0 4 2 77.14 1.22 1.2365 6 1 1 8 77.95 2.23 1.2256 3 3 3 4 80.59 1.89 1.1920 6 2 1 8 81.73 2.54 1.1782 5 4 1 8 82.18 1.16 1.1730 5 3 2 8 84.45 2.16 1.1471 6 0 2 8 85.94 1.53 1.1310 4 3 3 8 87.07 2.47 1.1192 5 1 3 8 87.34 1.18 1.1164 3 0 4 8 88.47 1.15 1.1051 3 1 4 8 88.97 1.16 1.1001 6 2 2 8 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.