Crystal Structure Refinement of Gaivinoxyl Radical, C29H41O2, Based on Synchrotron X-ray Powder Diffraction and Rietveld Method

1994 ◽  
Vol 41 (6) ◽  
pp. 797-802 ◽  
Author(s):  
Hwo-Shuenn Sbeu ◽  
Chih-Hao Lee ◽  
Yu Wang ◽  
Long Y. Chiang
Keyword(s):  
Crystal Structure ◽  
Powder Diffraction ◽  
Rietveld Method ◽  
Structure Refinement ◽  
Crystal Structure Refinement ◽  
X Ray

Crystal structure of potassium tetraperoxomolybdate (VI) K2[Mo(O2)4]

2005 ◽  
Vol 20 (3) ◽  
pp. 203-206 ◽  
Author(s):  
M. Grzywa ◽  
M. Różycka ◽  
W. Łasocha
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Diffraction Pattern ◽  
Powder Diffraction ◽  
Rietveld Method ◽  
Structure Refinement ◽  
Crystal Structure Refinement ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters

Potassium tetraperoxomolybdate (VI) K2[Mo(O2)4] was prepared, and its X-ray powder diffraction pattern was recorded at low temperature (258 K). The unit cell parameters were refined to a=10.7891(2) Å, α=64.925(3)°, space group R−3c (167), Z=6. The compound is isostructural with potassium tetraperoxotungstate (VI) K2[W(O2)4] (Stomberg, 1988). The sample of K2[Mo(O2)4] was characterized by analytical investigations, and the results of crystal structure refinement by Rietveld method are presented; final RP and RWP are 9.79% and 12.37%, respectively.

Crystal structure refinement of A-type carbonate apatite by X-ray powder diffraction

2010 ◽  
Vol 45 (9) ◽  
pp. 2419-2426 ◽  
Author(s):  
Toru Tonegawa ◽  
Toshiyuki Ikoma ◽  
Tomohiko Yoshioka ◽  
Nobutaka Hanagata ◽  
Junzo Tanaka
Keyword(s):  
Crystal Structure ◽  
Powder Diffraction ◽  
Structure Refinement ◽  
Carbonate Apatite ◽  
Crystal Structure Refinement ◽  
X Ray

Rietveld Structure Refinement of Metastable Lithium Disilicate Using Synchrotron X-Ray Powder Diffraction Data From the Daresbury SRS 8.3 Diffractometer

1990 ◽  
Vol 5 (3) ◽  
pp. 137-143 ◽  
Author(s):  
R.I. Smith ◽  
A.R. West ◽  
I. Abrahams ◽  
P.G. Bruce
Keyword(s):  
Crystal Structure ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Rietveld Method ◽  
Structure Refinement ◽  
Powder Diffraction Data ◽  
X Ray ◽  
New Instrument ◽  
Diffraction Peaks

AbstractThe crystal structure of metastable Li2Si2O5, Fw = 150.05, has been refined by the Rietveld method using high resolution X-ray powder diffraction data recorded at the Daresbury Synchrotron Radiation Source on the new 8.3 diffractometer. Li2Si2O5, in keeping with many compounds of interest to the materials scientist, exhibits relatively broad diffraction peaks. It is important to establish the quality of crystal structure data that may be obtained from such materials on this new instrument. Various functions were used to model the peak shape from this instrument; a split-Pearson VII function appeared to be marginally superior to Pearson VII or Pseudo-Voigt functions. Refinement was carried out using the split-Pearson VII in the space group Pbcn (60) and terminated with a = 5.6871(6), b = 4.7846(5), c = 14.645(1) Å, V = 398.50 Å3, Z=4, Dc= 2.502 gcm−3, Rwp = 17.06, Rex = 14.48 and Χ2 = 1.39. The refined parameters are compared with those obtained from a previous single crystal X-ray determination.

Crystal structure refinement of Nd2−xCexCuOrm4 (x = 0.05−0.30) by x-ray (295 K) and neutron (1.5 K) powder diffraction

1990 ◽  
Vol 73 (11) ◽  
pp. 791-795 ◽  
Author(s):  
E.F. Paulus ◽  
I. Yehia ◽  
H. Fuess ◽  
J. Rodriguez ◽  
T. Vogt ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Powder Diffraction ◽  
Structure Refinement ◽  
Crystal Structure Refinement ◽  
X Ray
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