Lu2Si2O7 Fleet M E, Liu X American Mineralogist 89 (2004) 396-404 A new rare earth disilicate (REE2Si2O7: REE = Dy, Tm, Lu; type-L): Evidence for nonquenchable 10 GPa polymorph with silicon in fivefold trigonal bipyramidal coordination? _database_code_amcsd 0003424 CELL PARAMETERS: 6.5240 6.5553 17.7909 83.977 88.074 87.846 SPACE GROUP: P-1 X-RAY WAVELENGTH: 1.541838 Cell Volume: 755.788 Density (g/cm3): 6.633 MAX. ABS. INTENSITY / VOLUME**2: 48.80154693 RIR: 2.396 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 5.00 2.27 17.6848 0 0 1 2 10.00 4.08 8.8424 0 0 2 2 13.59 8.16 6.5165 1 0 0 2 13.59 13.67 6.5153 0 1 0 2 13.99 11.59 6.3305 0 1 1 2 14.34 9.13 6.1747 1 0 1 2 14.97 4.07 5.9176 0 -1 1 2 15.03 1.09 5.8949 0 0 3 2 16.04 2.78 5.5263 0 1 2 2 16.66 16.89 5.3223 1 0 2 2 17.14 1.99 5.1726 -1 0 2 2 17.73 1.13 5.0031 0 -1 2 2 18.93 2.13 4.6885 1 1 0 2 19.23 1.01 4.6161 0 1 3 2 19.59 1.38 4.5305 -1 1 0 2 19.98 2.09 4.4440 -1 1 1 2 20.01 26.16 4.4380 1 0 3 2 20.08 2.93 4.4212 0 0 4 2 20.49 33.01 4.3355 1 -1 1 2 20.57 83.28 4.3176 1 1 2 2 20.62 20.00 4.3081 -1 0 3 2 21.57 28.53 4.1189 -1 1 2 2 24.67 3.18 3.6089 -1 0 4 2 25.38 2.29 3.5087 -1 -1 3 2 25.40 2.56 3.5061 1 -1 3 2 25.49 1.22 3.4938 0 -1 4 2 26.34 8.08 3.3831 1 1 4 2 27.32 28.97 3.2647 0 2 1 2 27.37 2.38 3.2582 2 0 0 2 27.38 7.14 3.2576 0 2 0 2 27.42 12.29 3.2533 0 1 5 2 27.69 5.86 3.2215 2 0 1 2 27.99 2.00 3.1874 -2 0 1 2 28.35 4.09 3.1482 1 0 5 2 28.37 4.11 3.1461 0 -2 1 2 28.92 8.02 3.0873 2 0 2 2 28.93 13.68 3.0859 1 -1 4 2 29.06 26.96 3.0725 -1 -1 4 2 29.50 10.67 3.0281 -2 0 2 2 29.93 2.20 2.9854 0 2 3 2 29.97 2.18 2.9814 0 -1 5 2 30.15 1.57 2.9640 1 1 5 2 30.21 57.21 2.9588 0 -2 2 2 30.25 1.04 2.9549 2 1 0 2 30.25 13.31 2.9546 1 2 0 2 30.32 100.00 2.9475 0 0 6 2 30.86 15.14 2.8977 1 2 2 2 30.96 27.00 2.8884 2 0 3 2 31.05 25.84 2.8800 -2 -1 1 2 31.11 16.72 2.8750 -2 1 0 2 31.11 5.27 2.8747 -1 2 0 2 31.19 2.52 2.8672 2 1 2 2 31.27 13.59 2.8602 -1 1 5 2 31.43 2.02 2.8465 -2 1 1 2 31.63 13.64 2.8290 2 -1 1 2 31.77 12.94 2.8163 -2 0 3 2 31.93 8.73 2.8029 1 -2 1 2 32.40 14.03 2.7633 1 2 3 2 32.40 27.02 2.7631 0 2 4 2 32.56 46.66 2.7499 -2 1 2 2 32.66 34.58 2.7421 -2 -1 2 2 32.76 4.28 2.7337 0 -2 3 2 32.88 5.78 2.7238 2 1 3 2 32.92 7.25 2.7209 1 -1 5 2 32.95 2.84 2.7186 2 -1 2 2 32.98 2.02 2.7158 -1 -2 2 2 33.53 21.42 2.6729 1 -2 2 2 33.68 3.48 2.6611 2 0 4 2 33.75 11.14 2.6559 -1 0 6 2 34.35 4.69 2.6110 1 1 6 2 34.68 4.86 2.5865 0 -1 6 2 34.68 3.59 2.5863 -2 0 4 2 34.96 5.11 2.5665 -2 -1 3 2 35.26 12.30 2.5455 2 1 4 2 35.42 6.13 2.5343 -1 -2 3 2 35.47 1.23 2.5306 0 2 5 2 35.90 1.51 2.5015 0 -2 4 2 35.90 20.25 2.5014 -1 2 4 2 37.24 5.52 2.4145 1 -1 6 2 37.50 2.27 2.3981 1 2 5 2 37.57 1.06 2.3938 -1 -1 6 2 37.65 7.18 2.3891 2 -1 4 2 37.81 1.40 2.3796 1 0 7 2 37.85 1.63 2.3767 -2 -1 4 2 38.21 11.82 2.3552 2 1 5 2 38.42 5.84 2.3428 -1 -2 4 2 38.60 1.14 2.3322 -1 0 7 2 38.79 1.08 2.3217 -1 2 5 2 39.02 5.40 2.3081 0 2 6 2 39.51 2.91 2.2811 0 -2 5 2 39.96 2.32 2.2564 -1 1 7 2 40.03 1.05 2.2525 -2 1 5 2 40.76 1.06 2.2138 -2 -2 2 2 40.82 3.93 2.2106 0 0 8 2 40.83 1.33 2.2100 2 -1 5 2 40.85 3.24 2.2090 1 2 6 2 41.36 1.82 2.1832 0 3 1 2 41.58 11.34 2.1722 3 0 0 2 41.58 6.75 2.1718 0 3 0 2 41.76 1.86 2.1628 0 1 8 2 41.79 2.07 2.1617 0 3 2 2 41.83 3.86 2.1598 1 -1 7 2 41.90 2.36 2.1562 -1 -2 5 2 41.94 1.05 2.1541 -2 0 6 2 42.06 2.00 2.1482 -3 0 1 2 42.46 2.17 2.1290 0 -3 1 2 42.56 7.27 2.1242 3 0 2 2 42.97 13.45 2.1050 0 2 7 2 43.20 2.10 2.0943 1 3 1 2 43.45 4.11 2.0829 3 1 1 2 43.46 3.19 2.0822 3 1 0 2 43.47 7.58 2.0819 1 3 0 2 43.53 1.29 2.0790 2 -2 3 2 43.54 2.89 2.0784 -2 1 6 2 43.55 19.69 2.0781 1 1 8 2 43.56 8.15 2.0776 1 3 2 2 43.99 5.20 2.0582 3 0 3 2 44.06 1.23 2.0553 3 1 2 2 44.36 1.53 2.0419 -1 -3 1 2 44.41 4.57 2.0398 -3 1 0 2 44.42 1.68 2.0395 -1 3 0 2 44.45 7.08 2.0383 2 -1 6 2 44.53 1.41 2.0346 0 3 4 2 44.55 3.40 2.0339 1 3 3 2 44.68 2.56 2.0282 -1 1 8 2 44.70 3.86 2.0274 -3 1 1 2 44.71 2.82 2.0268 -1 3 2 2 44.73 4.87 2.0260 2 0 7 2 44.75 1.32 2.0253 3 -1 1 2 45.28 3.62 2.0025 3 1 3 2 45.36 1.73 1.9994 -3 -1 2 2 45.60 1.51 1.9895 -3 1 2 2 45.76 5.50 1.9827 -1 -2 6 2 45.78 2.75 1.9821 -1 3 3 2 45.79 2.28 1.9817 1 -2 6 2 46.12 2.68 1.9683 -2 0 7 2 46.57 1.38 1.9500 1 -3 2 2 46.76 1.43 1.9428 0 3 5 2 46.89 1.60 1.9377 0 1 9 2 47.11 1.27 1.9292 -1 -1 8 2 47.17 2.59 1.9269 -3 0 4 2 47.42 2.11 1.9173 -1 3 4 2 47.96 2.20 1.8970 1 0 9 2 48.43 4.28 1.8797 2 -1 7 2 48.50 3.14 1.8770 1 -3 3 2 48.59 1.09 1.8738 0 -3 4 2 48.72 4.61 1.8692 1 2 8 2 48.81 2.08 1.8660 -1 0 9 2 48.85 2.78 1.8645 2 -2 5 2 49.11 1.79 1.8552 2 0 8 2 49.15 3.93 1.8536 -2 -1 7 2 49.28 2.11 1.8490 3 -1 4 2 49.35 1.15 1.8465 2 3 1 2 49.46 2.19 1.8426 3 2 1 2 49.48 2.37 1.8421 0 3 6 2 49.59 1.61 1.8383 -1 3 5 2 49.64 9.57 1.8367 2 3 2 2 49.64 1.39 1.8366 2 1 8 2 49.64 13.30 1.8365 3 2 0 2 49.89 4.15 1.8279 1 -2 7 2 50.38 2.90 1.8112 -3 -2 1 2 50.45 1.95 1.8090 -1 -3 4 2 50.48 2.94 1.8078 2 3 3 2 50.50 6.48 1.8073 -2 -3 1 2 50.58 3.74 1.8045 -2 0 8 2 50.94 1.60 1.7928 1 -3 4 2 51.35 1.79 1.7793 -3 2 0 2 51.35 12.69 1.7792 -2 3 0 2 51.45 2.93 1.7761 -3 2 1 2 51.62 2.18 1.7706 0 -3 5 2 51.65 1.16 1.7698 1 -1 9 2 51.67 19.05 1.7692 -2 1 8 2 51.69 1.31 1.7685 0 0 10 2 51.84 3.01 1.7636 3 -1 5 2 51.90 2.47 1.7617 -2 -3 2 2 52.01 3.63 1.7583 2 -3 1 2 52.10 3.96 1.7553 -3 2 2 2 52.17 1.82 1.7531 -1 -1 9 2 52.20 1.02 1.7524 3 1 6 2 52.32 3.64 1.7487 3 2 4 2 52.35 2.34 1.7478 -3 -1 5 2 52.37 13.73 1.7469 0 -2 8 2 52.71 1.10 1.7366 -2 3 3 2 52.72 1.11 1.7362 2 -1 8 2 52.81 2.24 1.7336 3 -2 2 2 53.12 5.09 1.7242 -3 0 6 2 53.12 2.69 1.7240 1 2 9 2 53.21 5.67 1.7215 2 -3 2 2 53.30 2.17 1.7188 -3 2 3 2 53.58 7.71 1.7103 -2 -1 8 2 53.60 4.55 1.7099 1 1 10 2 53.75 2.22 1.7053 2 0 9 2 53.79 3.90 1.7043 2 3 5 2 53.82 3.63 1.7034 -2 -3 3 2 54.10 1.91 1.6952 2 1 9 2 54.23 2.35 1.6913 -2 3 4 2 54.30 2.81 1.6895 1 -2 8 2 54.32 1.23 1.6888 3 2 5 2 54.33 2.89 1.6884 3 -2 3 2 54.45 4.51 1.6851 -1 -2 8 2 54.60 4.06 1.6808 -3 1 6 2 55.01 3.26 1.6694 -3 2 4 2 55.31 1.45 1.6609 -2 0 9 2 55.59 1.56 1.6532 -3 -1 6 2 55.89 1.18 1.6450 2 -2 7 2 56.17 1.52 1.6376 0 4 1 2 56.18 1.44 1.6374 2 3 6 2 56.21 6.44 1.6364 -2 -3 4 2 56.26 1.29 1.6352 -2 3 5 2 56.36 6.85 1.6325 3 -2 4 2 56.36 3.11 1.6323 0 4 2 2 56.49 3.08 1.6291 4 0 0 2 56.50 1.73 1.6288 0 4 0 2 56.58 2.71 1.6267 4 0 1 2 56.58 1.43 1.6266 0 2 10 2 56.80 6.94 1.6208 3 2 6 2 56.85 2.27 1.6194 1 -1 10 2 56.86 1.89 1.6193 -1 -3 6 2 57.14 3.68 1.6120 1 -3 6 2 57.19 3.99 1.6107 4 0 2 2 57.21 1.88 1.6103 0 -2 9 2 57.31 1.20 1.6077 0 0 11 2 57.34 1.80 1.6068 0 -4 1 2 57.40 4.48 1.6055 1 3 8 2 57.43 3.18 1.6045 -1 -1 10 2 57.52 2.74 1.6023 1 4 1 2 57.61 1.89 1.6000 0 1 11 2 57.82 1.70 1.5947 4 1 1 2 57.98 1.29 1.5905 -3 1 7 2 58.26 1.47 1.5836 3 -1 7 2 58.29 1.53 1.5830 -2 -1 9 2 58.30 5.80 1.5826 0 4 4 2 58.31 3.69 1.5824 4 0 3 2 58.64 1.39 1.5744 -1 4 1 2 58.69 3.74 1.5730 0 -4 2 2 58.69 4.02 1.5730 3 0 8 2 58.74 10.64 1.5717 -2 3 6 2 58.83 1.12 1.5696 2 1 10 2 58.87 3.33 1.5688 -1 4 2 2 58.90 1.04 1.5679 -4 1 0 2 59.01 1.41 1.5653 2 3 7 2 59.15 9.57 1.5619 -1 2 10 2 59.30 2.55 1.5584 -4 0 3 2 59.72 2.83 1.5485 3 2 7 2 60.01 1.71 1.5415 0 4 5 2 60.07 1.68 1.5403 -1 1 11 2 61.10 1.04 1.5166 4 -1 3 2 61.22 5.88 1.5141 -4 0 4 2 61.23 3.40 1.5137 1 3 9 2 61.71 5.38 1.5032 -3 -2 6 2 62.19 1.61 1.4927 0 4 6 2 62.25 2.01 1.4913 2 3 8 2 62.26 2.16 1.4912 1 -1 11 2 62.28 1.02 1.4907 0 -2 10 2 62.30 1.52 1.4902 -2 -3 6 2 62.62 1.21 1.4834 4 1 5 2 62.71 1.11 1.4815 4 2 1 2 62.75 1.66 1.4807 1 2 11 2 62.81 4.19 1.4794 0 -4 4 2 62.82 3.26 1.4793 3 0 9 2 62.84 1.32 1.4789 2 -3 6 2 62.90 1.46 1.4775 4 2 0 2 62.91 3.76 1.4773 -3 2 7 2 63.01 1.61 1.4753 3 1 9 2 63.08 3.94 1.4737 0 0 12 2 63.21 1.55 1.4710 -3 -1 8 2 63.25 1.62 1.4702 -2 -1 10 2 63.59 1.36 1.4632 -4 0 5 2 63.79 1.08 1.4591 2 0 11 2 63.80 2.17 1.4589 4 2 3 2 63.83 2.09 1.4583 2 1 11 2 64.23 1.24 1.4502 -1 -2 10 2 64.29 1.17 1.4488 2 4 4 2 64.39 1.30 1.4468 0 3 10 2 64.53 4.33 1.4442 4 0 6 2 64.74 1.42 1.4400 -4 -2 2 2 64.80 2.18 1.4387 0 4 7 2 64.93 1.11 1.4361 1 -4 4 2 64.99 4.06 1.4350 -4 2 1 2 65.06 1.47 1.4336 4 2 4 2 65.26 1.50 1.4296 -3 -2 7 2 65.33 3.19 1.4283 -1 0 12 2 65.59 1.51 1.4233 -4 2 2 2 65.81 1.04 1.4190 1 4 7 2 65.94 1.83 1.4166 -2 -3 7 2 66.30 2.76 1.4098 2 -3 7 2 66.36 2.49 1.4087 -4 -2 3 2 66.37 1.01 1.4085 -3 2 8 2 67.00 1.25 1.3968 -1 -4 5 2 67.47 1.21 1.3881 4 0 7 2 67.52 1.01 1.3872 0 -3 9 2 67.57 1.18 1.3863 1 -4 5 2 67.88 2.16 1.3807 1 -1 12 2 68.32 1.01 1.3730 -3 3 6 2 68.69 1.63 1.3664 -2 3 9 2 69.94 1.21 1.3451 -2 -3 8 2 70.14 3.27 1.3417 2 -3 8 2 70.33 2.25 1.3386 -1 4 8 2 70.62 1.18 1.3337 1 -4 6 2 70.75 1.47 1.3316 3 4 1 2 70.80 1.81 1.3308 3 2 10 2 70.93 1.44 1.3287 -4 -2 5 2 70.99 2.24 1.3277 4 3 2 2 71.30 2.37 1.3228 4 -2 5 2 72.31 1.93 1.3068 3 4 4 2 72.46 1.24 1.3044 0 2 13 2 72.85 1.05 1.2983 3 -2 9 2 73.32 2.71 1.2912 -3 -4 2 2 73.65 1.70 1.2863 1 5 0 2 73.85 2.09 1.2833 -4 -2 6 2 73.90 1.01 1.2824 -4 3 1 2 74.41 1.09 1.2749 -1 5 1 2 74.55 1.46 1.2730 4 0 9 2 74.75 1.13 1.2699 -3 4 3 2 74.94 2.29 1.2672 5 -1 1 2 75.07 1.84 1.2653 0 4 10 2 75.16 1.59 1.2641 -5 -1 2 2 75.45 1.44 1.2600 -4 2 7 2 75.89 1.20 1.2537 -1 -5 2 2 76.11 1.01 1.2507 -2 4 8 2 76.14 1.35 1.2503 1 1 14 2 77.13 1.24 1.2366 3 -4 3 2 77.17 1.13 1.2361 -4 0 9 2 77.28 2.98 1.2346 3 -2 10 2 77.55 1.10 1.2310 -3 4 5 2 77.57 1.32 1.2308 2 5 1 2 77.72 2.09 1.2287 1 5 6 2 77.89 1.38 1.2264 3 4 7 2 77.95 1.11 1.2257 2 5 3 2 78.69 1.09 1.2160 -4 2 8 2 78.92 1.64 1.2130 2 3 12 2 78.99 1.65 1.2121 -2 -3 10 2 80.02 1.40 1.1991 2 4 10 2 80.18 1.45 1.1971 -3 1 12 2 80.66 1.67 1.1912 4 -3 5 2 81.31 1.13 1.1832 4 3 8 2 81.52 2.91 1.1808 -4 0 10 2 81.61 1.83 1.1797 -2 5 4 2 81.86 1.45 1.1768 4 4 2 2 81.98 2.46 1.1753 -2 3 12 2 82.12 1.16 1.1737 -2 -5 3 2 82.26 2.22 1.1720 2 -5 2 2 82.88 3.28 1.1649 -2 1 14 2 82.96 1.15 1.1639 4 1 11 2 83.29 1.98 1.1602 1 -5 5 2 83.51 1.26 1.1576 -5 2 4 2 84.42 1.48 1.1475 1 -3 12 2 85.01 1.20 1.1410 -4 -2 9 2 85.05 2.84 1.1405 0 -4 10 2 85.23 1.24 1.1386 0 -2 14 2 85.24 2.16 1.1385 5 -1 7 2 85.45 1.13 1.1363 1 3 14 2 85.79 1.76 1.1326 -4 4 0 2 86.20 1.24 1.1282 3 5 4 2 86.99 1.88 1.1200 -2 -5 5 2 87.11 1.92 1.1188 -1 -2 14 2 87.40 1.17 1.1158 -1 5 9 2 88.03 1.37 1.1095 4 0 12 2 88.29 1.53 1.1069 -4 -4 4 2 88.31 1.31 1.1067 5 3 5 2 88.47 1.11 1.1051 -3 -2 12 2 88.79 1.05 1.1019 0 4 13 2 89.02 1.37 1.0997 1 1 16 2 89.20 1.03 1.0979 -3 2 13 2 89.52 1.28 1.0948 -2 -3 12 2 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.