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★ lixj1228(金币+3):非常感谢 2010-04-19 08:20 wsht212(金币+1): 2010-04-19 20:03
Cr7C3
*data for ICSD #87129
Coll Code 87129
Rec Date 2000/07/15
Mod Date 2007/08/01
Chem Name Chromium Carbide (7/3)
Structured Cr7 C3
Sum C3 Cr7
ANX N3O7
D(calc) 6.9
Title Etude cristallographique des carbures Cr7 C3 et Mn7 C3
Author(s) Rouault, M.A.;Herpin, P.;Fruchart, M.R.
Reference Annales de Chimie (Paris) (Vol=Year)
(1970), 5, 461-470
Powder Diffraction
(1986), 1, 77-99
Unit Cell 7.01 12.142 4.526 90. 90. 90.
Vol 385.23
Z 4
Space Group P m c n
SG Number 62
Cryst Sys orthorhombic
Pearson oP40
Wyckoff d3 c4
R Value .1
Red Cell P 4.526 7.01 12.142 90 90 90 385.232
Trans Red 0.000 0.000 1.000 / 1.000 0.000 0.000 / 0.000 1.000 0.000
Comments AE: Cr1,2: Cr11 C3; Cr3,5: Cr11 C4; Cr4; Cr12 C3; C1,2: Cr8
Cell from 2nd ref. (McMurdie et al., National Bureau of
Standards): 7.0149(12), 12.153(4), 4.5320(4)
The structure has been assigned a PDF number (experimental
powder diffraction data): 36-1482
Structure type prototype : Cr7C3
Structure type : Cr7C3
X-ray diffraction from single crystal
At least one temperature factor missing in the paper.
Atom # OX SITE x y z SOF H
Cr 1 +0 8 d 0.064(2) 0.811(9) 0.056(5) 1. 0
Cr 2 +0 4 c 0.25 0.626(1) 0.057(9) 1. 0
Cr 3 +0 4 c 0.25 0.206(3) 0.250(1) 1. 0
Cr 4 +0 4 c 0.25 0.416(5) 0.261(9) 1. 0
Cr 5 +0 8 d 0.065(7) 0.021(8) 0.250(9) 1. 0
C 1 +0 4 c 0.25 0.562(9) 0.459(4) 1. 0
C 2 +0 8 d 0.029(1) 0.342(8) 0.028(8) 1. 0
*end for ICSD #87129 |
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