Composition and temperature dependence of cation ordering in Ni-Mg olivine solid solutions: a time-of-flight neutron powder diffraction and EXAFS study

2001 ◽  
Vol 86 (10) ◽  
pp. 1170-1187 ◽  
Author(s):  
C. Michael B. Henderson ◽  
Simon A.T. Redfern ◽  
Ronald I. Smith ◽  
Kevin S. Knight ◽  
John M. Charnock
Keyword(s):  
Temperature Dependence ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Time Of Flight ◽  
Neutron Powder Diffraction ◽  
Cation Ordering ◽  
Exafs Study

Further study of the cation ordering in phengite 3T by neutron powder diffraction

2000 ◽  
Vol 64 (1) ◽  
pp. 11-18 ◽  
Author(s):  
A. Pavese ◽  
G. Ferraris ◽  
V. Pischedda ◽  
P. Radaelli
Keyword(s):  
Chemical Composition ◽  
Neutron Diffraction ◽  
Powder Diffraction ◽  
Time Of Flight ◽  
Western Alps ◽  
Neutron Powder Diffraction ◽  
Cation Ordering ◽  
Data Sets ◽  
Octahedral Sheet ◽  
Powder Neutron Diffraction

AbstractPhengite 3T (Dora-Maira massif, Italian western Alps), with chemical composition K0.96Na0.01Al1.44Mg0.56(Si3.59 Al0.41)O10(OH)2 has been investigated using powder neutron diffraction, at the ILL (Institut Laue-Langevin) Facility, on the D2B diffractometer. Data sets were collected at 293 and 873 K, and the present results are compared with those obtained previously using the time-of-flight (TOF) technique, on the same compound. In the octahedral sheet, Al tends to order into the M2 site, in accordance with the measurements mentioned above, whereas the Al/Si tetrahedral ordering we observe (i.e. Si fully into T1 site) is at variance with that determined previously. These discrepancies are ascribed to the presence of talc impurities in the sample used previously (∼6 wt.%), which affected the results obtained.

Determination of the Cation Distribution in NiFe2(PO4)2 using Resonant X-ray and Neutron Powder Diffraction

1995 ◽  
Vol 28 (5) ◽  
pp. 494-502 ◽  
Author(s):  
J. K. Warner ◽  
A. K. Cheetham ◽  
D. E. Cox
Keyword(s):  
Powder Diffraction ◽  
National Laboratory ◽  
Time Of Flight ◽  
Brookhaven National Laboratory ◽  
Neutron Powder Diffraction ◽  
Anomalous Scattering ◽  
Edge Structure ◽  
X Ray ◽  
Scattering Correction

The distribution of divalent iron and nickel over two metal sites of differing coordination geometry in NiFe2(PO4)2, sarcopside, has been investigated by resonant X-ray and time-of-flight neutron powder diffraction. To assess the reproducibility of the X-ray technique, data have been collected from instruments X7A at Brookhaven National Laboratory and 8.3 at the Synchrotron Radiation Source, Daresbury Laboratory, England, using wavelengths λ X1 = 1.7437 (3) Å and λ X2 = 1.7434 (1) Å, respectively, close to the Fe2+ K edge determined by X-ray absorption near-edge structure. The real part of the anomalous-scattering correction for iron at each energy, f′(Fe) X1 = −7.81 (9) and f′(Fe) X2 = −10.16 (6), was determined experimentally by diffraction from Fe3(PO4)2 under identical conditions. Occupancies obtained for iron at the M(1) site were found to be M(1) X1 = 0.366 (6) and M(1) X2 = 0.376 (3), compared with M(1) N = 0.26 (15) from time-of-flight neutron powder diffraction.

ChemInform Abstract: Structure of SrRuO3 by Time-of-Flight Neutron Powder Diffraction.

ChemInform ◽  
1989 ◽  
Vol 20 (40) ◽  
Author(s):  
C. W. JONES ◽  
P. D. BATTLE ◽  
P. LIGHTFOOT ◽  
W. T. A. HARRISON
Keyword(s):  
Powder Diffraction ◽  
Time Of Flight ◽  
Neutron Powder Diffraction ◽  
Abstract Structure

Time-of-Flight Neutron Powder Diffraction Investigation of Tb2Co17-xGax Permanent Magnet Materials

1998 ◽  
Vol 278-281 ◽  
pp. 537-541 ◽  
Author(s):  
L. Giovanelli ◽  
O. Moze ◽  
Winfried A. Kockelmann ◽  
C.H. de Groot ◽  
F.R. de Boer ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Powder Diffraction ◽  
Time Of Flight ◽  
Neutron Powder Diffraction ◽  
Permanent Magnet Materials

Crystal Structure of La4Si2O7N2Analyzed by the Rietveld Method Using the Time-of-Flight Neutron Powder Diffraction Data

2003 ◽  
Vol 15 (5) ◽  
pp. 1099-1104 ◽  
Author(s):  
Junichi Takahashi ◽  
Hisanori Yamane ◽  
Naoto Hirosaki ◽  
Yoshinobu Yamamoto ◽  
Takayuki Suehiro ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Rietveld Method ◽  
Time Of Flight ◽  
Neutron Powder Diffraction ◽  
Powder Diffraction Data ◽  
Neutron Powder Diffraction Data
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