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蔣婉芹鐵桿木蟲 (正式寫手)
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[求助]
鈣鉻榴石的晶體結(jié)構(gòu)
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| Calcium chromium garnet crystal structure 鈣鉻榴石的晶體結(jié)構(gòu)及原子的排列誰能幫忙找到 |

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*data for ICSD #82743 Coll Code 82743 Rec Date 1998/06/26 Mod Date 1999/11/30 Chem Name Tricalcium Dichromium Tris(silicate) Structured Ca3 Cr2 (Si O4)3 Sum Ca3 Cr2 O12 Si3 ANX A2B3C3X12 Min Name Uvarovite D(calc) 3.84 Title Rietveld study of uvarovite-titanium garnet solid solutions synthesized by sol-gel methods Author(s) Esteve, V.;Carda, J.;Cordoncillo, E.;Escribano, P.;Reventos, M.M.;Amigo, J.M. Reference Anales de Quimica International Edition (1996), 92, 285-287 Unit Cell 12.0065(1) 12.0065(1) 12.0065(1) 90. 90. 90. Vol 1730.81 Z 8 Space Group I a -3 d SG Number 230 Cryst Sys cubic Pearson cI160 Wyckoff h d c a R Value .066 Red Cell I 10.397 10.397 10.397 109.471 109.471 109.471 865.405 Trans Red 0.500 0.500 -0.500 / -0.500 0.500 0.500 / 0.500 -0.500 0.500 Comments Compound with mineral name: Uvarovite The structure has been assigned a PDF number (calculated powder diffraction data): 01-087-1007 The structure has been assigned a PDF number (experimental powder diffraction data): 11-696 Rietveld profile refinement applied Structure type : Al2Ca3Si3O12 X-ray diffraction (powder) At least one temperature factor is implausible or meaningless but agrees with the value given in the paper. Atom # OX SITE x y z SOF H Ca 1 +2 24 c 0.125 0 0.25 1. 0 Cr 1 +3 16 a 0 0 0 1. 0 Si 1 +4 24 d 0.375 0 0.25 1. 0 O 1 -2 96 h 0.4600(3) 0.5470(3) 0.6545(4) 1. 0 *end for ICSD #82743 |
鐵桿木蟲 (正式寫手)

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鐵桿木蟲 (職業(yè)作家)
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*data for ICSD #158537 Coll Code 158537 Rec Date 2008/02/01 Chem Name Tricalcium Dichromium Tris(silicate) Structured Ca3 Cr2 (Si O4)3 Sum Ca3 Cr2 O12 Si3 ANX A2B3C3X12 Min Name Uvarovite D(calc) 3.85 Title The crystal chemistry of birefringent natural uvarovites. Part III. Application of the superposition model of crystal fields with a characterization of synthetic cubic uvarovite Author(s) Andrut, M.;Wildner, M. Reference Physics and Chemistry of Minerals (Germany) (2002), 29, 595-608 Unit Cell 11.997(1) 11.997(1) 11.997(1) 90. 90. 90. Vol 1726.7 Z 8 Space Group I a -3 d SG Number 230 Cryst Sys cubic Pearson cI160 Wyckoff h d c a R Value .0218 Red Cell I 10.389 10.389 10.389 109.471 109.471 109.471 863.352 Trans Red 0.500 0.500 -0.500 / -0.500 0.500 0.500 / 0.500 -0.500 0.500 Comments Compound with mineral name: Uvarovite Structure type : Al2Ca3Si3O12 X-ray diffraction from single crystal Atom # OX SITE x y z SOF H Ca 1 +2 24 c 0.125 0. 0.250 1. 0 Cr 1 +3 16 a 0. 0. 0. 1. 0 Si 1 +4 24 d 0.375 0. 0.250 1. 0 O 1 -2 96 h 0.03917(5) 0.04770(5) 0.65433(5) 1. 0 Lbl Type U11 U22 U33 U12 U13 U23 Ca1 Ca2+ 0.0040(1) 0.0063(1) 0.0063(1) 0. 0. 0.0009(1) Cr1 Cr3+ 0.0034(1) 0.0034(1) 0.0034(1) 0. 0. 0. Si1 Si4+ 0.0030(2) 0.0033(1) 0.0033(1) 0. 0. 0. O1 O2- 0.0051(2) 0.0059(2) 0.0045(2) 0.0005(2) -0.0007(2) 0.0002(2) *end for ICSD #158537 |
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