EXAFS Study of Refractory Cement Phases: CaAl2O14H20, Ca2Al2O13H16, and Ca3Al2O12H12

1995 ◽  
Vol 5 (11) ◽  
pp. 1849-1864 ◽  
Author(s):  
N. Richard ◽  
N. Lequeux ◽  
P. Boch
Keyword(s):  
Refractory Cement ◽  
Exafs Study

EXAFS STUDY ON RADIATION INDUCED DEFECTS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-1045-C8-1048
Author(s):  
T. BOLZE ◽  
J. PEISL
Keyword(s):  
Radiation Induced ◽  
Exafs Study ◽  
Induced Defects

EXAFS STUDY OF c-Si, a-Si AND a-Si : H

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-379-C8-382 ◽  
Author(s):  
A. MENELLE ◽  
A. M. FLANK ◽  
P. LAGARDE ◽  
R. BELLISSENT
Keyword(s):  
Exafs Study

EDGE AND EXAFS STUDY OF CHARCOAL SUPPORTED Pt-Fe CATALYSTS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-297-C8-300 ◽  
Author(s):  
B. MORAWECK ◽  
P. BONDOT ◽  
D. GOUPIL ◽  
P. FOUILLOUX ◽  
A. J. RENOUPREZ
Keyword(s):  
Exafs Study ◽  
Fe Catalysts

EXAFS STUDY OF NICKEL AND IRON PRECURSORS OF HOMOGENEOUS ZIEGLER-TYPE HYDROGENATION CATALYSTS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-243-C8-248 ◽  
Author(s):  
C. ESSELIN ◽  
E. BAUER-GROSSE ◽  
J. GOULON ◽  
C. WILLIAMS ◽  
Y. CHAUVIN ◽  
...  
Keyword(s):  
Hydrogenation Catalysts ◽  
Exafs Study

Local atomic structure in tetragonal pure ZrO2nanopowders

2010 ◽  
Vol 43 (2) ◽  
pp. 227-236 ◽  
Author(s):  
Leandro M. Acuña ◽  
Diego G. Lamas ◽  
Rodolfo O. Fuentes ◽  
Ismael O. Fábregas ◽  
Márcia C. A. Fantini ◽  
...  
Keyword(s):  
Tetragonal Phase ◽  
Local Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Structures ◽  
Crystallite Sizes ◽  
Exafs Study ◽  
The Difference ◽  
X Ray Absorption ◽  
Good Agreement

The local atomic structures around the Zr atom of pure (undoped) ZrO2nanopowders with different average crystallite sizes, ranging from 7 to 40 nm, have been investigated. The nanopowders were synthesized by different wet-chemical routes, but all exhibit the high-temperature tetragonal phase stabilized at room temperature, as established by synchrotron radiation X-ray diffraction. The extended X-ray absorption fine structure (EXAFS) technique was applied to analyze the local structure around the Zr atoms. Several authors have studied this system using the EXAFS technique without obtaining a good agreement between crystallographic and EXAFS data. In this work, it is shown that the local structure of ZrO2nanopowders can be described by a model consisting of two oxygen subshells (4 + 4 atoms) with different Zr—O distances, in agreement with those independently determined by X-ray diffraction. However, the EXAFS study shows that the second oxygen subshell exhibits a Debye–Waller (DW) parameter much higher than that of the first oxygen subshell, a result that cannot be explained by the crystallographic model accepted for the tetragonal phase of zirconia-based materials. However, as proposed by other authors, the difference in the DW parameters between the two oxygen subshells around the Zr atoms can be explained by the existence of oxygen displacements perpendicular to thezdirection; these mainly affect the second oxygen subshell because of the directional character of the EXAFS DW parameter, in contradiction to the crystallographic value. It is also established that this model is similar to another model having three oxygen subshells, with a 4 + 2 + 2 distribution of atoms, with only one DW parameter for all oxygen subshells. Both models are in good agreement with the crystal structure determined by X-ray diffraction experiments.

EXAFS-study of solvophobic interaction in the system krypton-ethanol

1992 ◽  
Vol 52 ◽  
pp. 1-13 ◽  
Author(s):  
H. Bertagnolli ◽  
M. Hoffmann ◽  
D. Peter
Keyword(s):  
Exafs Study

EXAFS study of passive films on Ni and NiMo alloy electrodes

1988 ◽  
Vol 12 (7) ◽  
pp. 380-384 ◽  
Author(s):  
L. Bosio ◽  
R. Cortès ◽  
P. Delichère ◽  
M. Froment ◽  
S. Joiret
Keyword(s):  
Passive Films ◽  
Exafs Study

Photostructural changes in bulk chalcogenide glasses: An EXAFS study

1988 ◽  
Vol 106 (1-3) ◽  
pp. 189-192 ◽  
Author(s):  
L.F. Gladden ◽  
S.R. Elliott ◽  
G.N. Greaves
Keyword(s):  
Chalcogenide Glasses ◽  
Exafs Study

EXAFS Study of Fe3 Interaction with ZrO2 and TiO2 Oxides

2005 ◽  
pp. 736 ◽  
Author(s):  
V. V. Kriventsov ◽  
D. I. Kochubey ◽  
G. Coln ◽  
M. C. Hidalgo ◽  
J. A. Navio ◽  
...  
Keyword(s):  
Exafs Study
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