Molecular and electronic structure of AnIVFeII(CN)6·xH2O (An = Th, U, Np) compounds: an X-ray absorption spectroscopy investigation

2000 ◽  
Vol 78 (10) ◽  
pp. 1305-1317
Author(s):  
Isabelle Bonhoure ◽  
Christophe Den Auwer ◽  
Christophe Cartier dit Moulin ◽  
Philippe Moisy ◽  
Jean-Claude Berthet ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Molecular Structures ◽  
Oxidation States ◽  
X Ray Diffraction ◽  
Acidic Media ◽  
X Ray ◽  
X Ray Absorption ◽  
Molecular Compounds ◽  
Molecular And Electronic Structure ◽  
Chemical Formulas

AnIVFeII(CN)6·xH2O (An = Th, U, Np) molecular compounds have been prepared by precipitation from acidic media. These microcrystalline compounds have been characterized by infrared spectroscopy, X-ray diffraction, and X-ray absorption spectroscopy. They have been found to be isostructural with the LnIIIKFeII(CN)6·4H2O compounds. The molecular structures of these compounds are presented and their chemical formulas are given: in all compounds, the Fe(CN)6 octahedra is conserved and the An ion is linked to the N atoms of the CN ligands. The formal oxidation states are also discussed.Key words: hexacyanoferrate, actinide, EXAFS, XANES, X-ray absorption spectroscopy.

The Relative Merits of Oxides of Hafnium, Cerium and Thorium as Surrogates for Plutonium Oxide in Calcium Phosphate Ceramics

2009 ◽  
Vol 1193 ◽  
Author(s):  
B. L. Metcalfe ◽  
S. K. Fong ◽  
L. A. Gerrard ◽  
I. W. Donald ◽  
E. S. Welch ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Calcination Temperature ◽  
Cerium Oxide ◽  
Absorption Spectroscopy ◽  
Hafnium Oxide ◽  
Intermediate Level ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption ◽  
Additional Phase

AbstractThe choice of surrogate for plutonium oxide for use during the initial stages of research into the immobilization of intermediate level pyrochemical wastes containing plutonium andamericium oxides in a calcium phosphate host has been investigated by powder X-ray diffraction and X-ray absorption spectroscopy. Two non-radioactive surrogates, hafnium oxide and cerium oxide, together with radioactive thorium oxide were compared. Similarities in behaviour were observed for all three surrogates when calcined at the lowest temperature, 750°C but differences became more pronounced as the calcination temperature was increased to 950°C. Although some reaction occurred between all the surrogates and the host to form a substituted whitlockite phase, increasing the temperature led to a significant increase in the cerium reaction and the formation of an additional phase, monazite. Additionally it was observed that the cerium became increasingly trivalent at higher temperatures.

scholarly journals Mechanism of pressure induced amorphization of SnI4: A combined x-ray diffraction—x-ray absorption spectroscopy study

2020 ◽  
Vol 153 (6) ◽  
pp. 064501
Author(s):  
Emiliano Fonda ◽  
Alain Polian ◽  
Toru Shinmei ◽  
Tetsuo Irifune ◽  
Jean-Paul Itié
Keyword(s):  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

Chromium Environment within Cr-Doped BaAl2O4: Correlation of X-ray Diffraction and X-ray Absorption Spectroscopy Investigations

2015 ◽  
Vol 54 (23) ◽  
pp. 11127-11135 ◽  
Author(s):  
Martina Vrankić ◽  
Biserka Gržeta ◽  
Dirk Lützenkirchen-Hecht ◽  
Sanja Bosnar ◽  
Ankica Šarić
Keyword(s):  
Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Probing the variability in oxidation states of magnetite nanoparticles by single-particle spectroscopy

2018 ◽  
Vol 6 (4) ◽  
pp. 875-882 ◽  
Author(s):  
A. Fraile Rodríguez ◽  
C. Moya ◽  
M. Escoda-Torroella ◽  
A. Romero ◽  
A. Labarta ◽  
...  
Keyword(s):  
Oxidation State ◽  
Absorption Spectroscopy ◽  
Magnetite Nanoparticles ◽  
Single Particle ◽  
Cation Distribution ◽  
Oxidation States ◽  
Magnetic Response ◽  
X Ray ◽  
Single Particle Spectroscopy ◽  
X Ray Absorption

Single-particle X-ray absorption spectroscopy reveals that the oxidation state and cation distribution of individual magnetite nanoparticles may be largely heterogeneous even when the macroscopic structural and magnetic response of the ensembles is uniform.

scholarly journals Structural dynamics of an iron molybdate catalyst under redox cycling conditions studied with in situ multi edge XAS and XRD

2020 ◽  
Vol 22 (20) ◽  
pp. 11713-11723 ◽  
Author(s):  
Abhijeet Gaur ◽  
Matthias Stehle ◽  
Kristian Viegaard Raun ◽  
Joachim Thrane ◽  
Anker Degn Jensen ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Absorption Spectroscopy ◽  
Structural Dynamics ◽  
Redox Cycling ◽  
X Ray Diffraction ◽  
Iron Molybdate ◽  
X Ray ◽  
X Ray Absorption

Combination of in situ multi-edge X-ray absorption spectroscopy at the Mo K- and Fe K-edges in combination with X-ray diffraction successfully uncovered structural dynamics and phase transformations of an iron molybdate catalyst during redox cycling.

scholarly journals New Insights on the Reversible Lithiation Mechanism of TiO2(B) by Operando X-ray Absorption Spectroscopy and X-ray Diffraction Assisted by First-Principles Calculations

2014 ◽  
Vol 118 (47) ◽  
pp. 27210-27218 ◽  
Author(s):  
Marcus Fehse ◽  
Mouna Ben Yahia ◽  
Laure Monconduit ◽  
Frédéric Lemoigno ◽  
Marie-Liesse Doublet ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
First Principles ◽  
First Principles Calculations ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Arsenite Oxidation by a Poorly Crystalline Manganese-Oxide. 2. Results from X-ray Absorption Spectroscopy and X-ray Diffraction

2010 ◽  
Vol 44 (22) ◽  
pp. 8467-8472 ◽  
Author(s):  
Brandon J. Lafferty ◽  
Matthew Ginder-Vogel ◽  
Mengqiang Zhu ◽  
Kenneth J. T. Livi ◽  
Donald L. Sparks
Keyword(s):  
Manganese Oxide ◽  
Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
Arsenite Oxidation ◽  
X Ray ◽  
X Ray Absorption
Sign in / Sign up

Export Citation Format

Share Document