scholarly journals Characterization of Structural Iron in Smectites — An Ab Initio Based X-ray Absorption Spectroscopy Study

2019 ◽  
Vol 53 (12) ◽  
pp. 6877-6886 ◽  
Author(s):  
Annamária Kéri ◽  
Rainer Dähn ◽  
Matthias Krack ◽  
Sergey V. Churakov
Keyword(s):  
Ab Initio ◽  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
Structural Iron ◽  
X Ray Absorption

X-ray absorption spectroscopy characterization of the interface in capped ZnO nanoparticles

2011 ◽  
Vol 1 (SRMS-7) ◽  
Author(s):  
C. Guglieri ◽  
J. Chaboy
Keyword(s):  
Ab Initio ◽  
Absorption Spectroscopy ◽  
Zno Nanoparticles ◽  
Organic Molecules ◽  
Extensive Study ◽  
X Ray ◽  
X Ray Absorption

We report here an extensive study of the ZnO nanoparticles (NPs) capped with different organic molecules by X-ray absorption spectroscopy (XAS) methods to proceed in the understanding of their unusual magnetism. We have performed a detailed ab initio calculation of the Zn K-edge XAS aimed at determining the influence of the different coordination induced by the capping. The results suggest that the observed differences of the XAS spectra are due to the formation of a well-defined interface between the oxide NPs and the capping molecules. The appearance of magnetism should be related to the modifications induced in the NPs by the surface bonds between Zn and the capping molecule.

Evidence for the presence of U–Mo–Al ternary compounds in the U–Mo/Al interaction layer grown by thermal annealing: a coupled micro X-ray diffraction and micro X-ray absorption spectroscopy study

2007 ◽  
Vol 40 (6) ◽  
pp. 1064-1075 ◽  
Author(s):  
Hervé Palancher ◽  
Philippe Martin ◽  
Vivian Nassif ◽  
Remi Tucoulou ◽  
Olivier Proux ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Absorption Spectroscopy ◽  
Solid Solutions ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
Interaction Layer ◽  
X Ray ◽  
Ternary Compounds ◽  
X Ray Absorption

The systematic presence of the ternary phases U6Mo4Al43and UMo2Al20is reported in a U–Mo/Al interaction layer grown by thermal annealing. This work shows, therefore, the low Mo solubility in UAl3and UAl4binary phases; it contradicts the hypothesis of the formation of (U,Mo)Al3and (U,Mo)Al4solid solutions often admitted in the literature. Using µ-XAS (micro X-ray absorption spectroscopy) at the MoKedge and µ-XRD (micro X-ray diffraction), the heterogeneity of the interaction layer obtained on a γ-U0.85Mo0.15/Al diffusion couple has been precisely investigated. The UMo2Al20phase has been identified at the closest location from the Al side. Moreover, µ-XRD mapping performed on an annealed fuel plate enabled the characterization of the four phases resulting from the γ-U0.85Mo0.15/Al and (U2Mo + α-U)/Al interactions. A strong correlation between the concentrations of UAl4and UMo2Al20and those of UAl3and U6Mo4Al43has been shown.

X-RAY ABSORPTION SPECTROSCOPY STUDY OF Cu-BASED METHANOL CATALYSTS. 2. REDUCED STATE

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-237-C8-242 ◽  
Author(s):  
B. S. CLAUSEN ◽  
B. LENGELER ◽  
B. S. RASMUSSEN ◽  
W. NIEMANN ◽  
H. TOPSØE
Keyword(s):  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption ◽  
Reduced State

Local structure of Fe in Fe-doped misfit-layered calcium cobaltite: An X-ray absorption spectroscopy study

2013 ◽  
Vol 204 ◽  
pp. 257-265 ◽  
Author(s):  
Natkrita Prasoetsopha ◽  
Supree Pinitsoontorn ◽  
Atipong Bootchanont ◽  
Pinit Kidkhunthod ◽  
Pornjuk Srepusharawoot ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Local Structure ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption
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