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ÊÇSrLa2Mg2W2O12°É£¿ ûÓÐÕâ¸ö½á¹¹µÄ£¬µ«ÊÇÎÄÏ×˵£ºThe powder pattern for SrLa2Mg2W2O12,ingeneral features, has been shown to be very similar to that of La2.67(Mg2W2)O12 with an orthorhombic cell with parameters [Synthesis, Characterization, and Microwave Dielectric Properties of Sr2−xLa2Mg1+xW2O12 (x=0, 1) Ceramics J. Am. Ceram. Soc., 93 [9] 2467¨C2469 (2010)] La2.67(Mg2W2)O12 µÄÈçÏ£º -------------------------- *data for ICSD #9868 Coll Code 9868 Rec Date 2003/10/01 Chem Name Lanthanum Magnesium Tungsten Oxide (0.7/0.5/0.5/3) Structured La0.667 (Mg0.5 W0.5) O3 Sum La0.667 Mg0.5 O3 W0.5 ANX A4B4C5X24 D(calc) 6.71 Title Synthesis and superstructure of La0.667 (Mg0.5 W0.5)3 Author(s) Torii, Y. Reference Chemistry Letters (1979), 1979, 1215-1218 Unit Cell 7.8157(5) 7.8344(6) 7.9067(6) 90. 90. 90. Vol 484.14 Z 8 Space Group P 2 2 2 SG Number 16 Cryst Sys orthorhombic Pearson oP37 Wyckoff u8 h g f e d c b a R Value .13 Red Cell P 7.815 7.834 7.906 90 90 90 484.138 Trans Red 1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000 Comments Real cell has doubled c, I222, ideal positions Total SOF on at least one site differs from unity (SOF < 0.997 resp. SOF > 1.003) The structure has been assigned a PDF number (calculated powder diffraction data): 01-071-6791 The structure has been assigned a PDF number (experimental powder diffraction data): 33-706 X-ray diffraction from single crystal Unusual difference between calculated and measured density At least one temperature factor missing in the paper. Atom # OX SITE x y z SOF H La 1 +3 1 a 0 0 0 1. 0 La 2 +3 1 b 0.5 0 0 1. 0 La 3 +3 1 c 0 0.5 0 1. 0 La 4 +3 1 e 0.5 0.5 0 1. 0 La 5 +3 1 d 0 0 0.5 0.333 0 La 6 +3 1 f 0.5 0 0.5 0.333 0 La 7 +3 1 g 0 0.5 0.5 0.333 0 La 8 +3 1 h 0.5 0.5 0.5 0.333 0 Mg 1 +2 4 u 0.25 0.25 0.25 1. 0 W 1 +6 4 u 0.75 0.75 0.75 1. 0 O 1 -2 4 u 0.25 0.25 0 1. 0 O 2 -2 4 u 0.25 0.25 0.5 1. 0 O 3 -2 4 u 0.25 0 0.25 1. 0 O 4 -2 4 u 0.25 0.5 0.25 1. 0 O 5 -2 4 u 0 0.25 0.25 1. 0 O 6 -2 4 u 0.5 0.25 0.25 1. 0 *end for ICSD #9868 |
2Â¥2012-08-28 13:51:56













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