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3Â¥2013-07-25 21:57:36
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*data for ICSD #245730 Coll Code 245730 Rec Date 2008/08/01 Chem Name Strontium Tecto-dialumodisilicate Structured Sr (Al2 Si2 O8) Sum Al2 O8 Si2 Sr1 ANX AB2C2X8 D(calc) 2.93 Title Resolving the aluminium ordering in alumosilicates by a combined experimental/theoretical study of 27Al electric field gradients Author(s) Rocquefelte, X.;Clabau, F.;Paris, M.;Deniard, P.;le Mercier, T.;Jobic, S.;Whangbo Myunghwan Reference Inorganic Chemistry (2007), 46(14), 5456-5458 Unit Cell 14.4075 13.0811 8.6368 90 115.05 90 Vol 1474.63 Z 8 Space Group I 1 2/c 1 SG Number 15 Cryst Sys monoclinic Pearson mS104 Wyckoff f13 Red Cell I 8.636 9.326 9.326 89.064 82.184 82.184 737.317 Trans Red 0.000 0.000 -1.000 / -0.500 -0.500 -0.500 / -0.500 0.500 -0.500 Comments Optimized ordered structure shows too short Sr-Sr distances of about 1,019A Electron structure calculation Geometry optimizations using the VASP and WIEN2k code NMR spectroscopy data given 27Al and 29Si Rietveld profile refinement applied Structure type : Celsian X-ray diffraction (powder) No R value given in the paper. At least one temperature factor missing in the paper. Atom # OX SITE x y z SOF H Sr 1 +2 8 f 0.4846 0.2509 0.6849 1. 0 Si 1 +4 8 f 0.2538 0.9241 0.3577 1. 0 Al 1 +3 8 f 0.2495 0.9271 0.1328 1. 0 Al 2 +3 8 f 0.4388 0.1286 0.42 1. 0 Si 2 +4 8 f 0.4297 0.3627 0.4215 1. 0 O 1 -2 8 f 0.2538 0.8778 0.2496 1. 0 O 2 -2 8 f 0.3335 0.2492 0.394 1. 0 O 3 -2 8 f 0.9474 0.1258 0.1413 1. 0 O 4 -2 8 f 0.0739 0.873 0.3545 1. 0 O 5 -2 8 f 0.2398 0.06 0.1192 1. 0 O 6 -2 8 f 0.2531 0.0485 0.3662 1. 0 O 7 -2 8 f 0.5514 0.3679 0.5468 1. 0 O 8 -2 8 f 0.5613 0.1231 0.5548 1. 0 *end for ICSD #245730 |
2Â¥2013-07-25 12:19:01
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4Â¥2013-07-26 18:33:25
cixindegu
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5Â¥2013-07-26 22:09:08













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