scholarly journals Laboratory Based X-ray Absorption Spectroscopy of Iron Phosphate Glasses for Radioactive Waste Immobilisation: A Preliminary Investigation.

2020 ◽  
Vol 818 ◽  
pp. 012020
Author(s):  
L M Mottram ◽  
M C Stennett ◽  
S K Sun ◽  
N C Hyatt
Keyword(s):  
Radioactive Waste ◽  
Absorption Spectroscopy ◽  
Preliminary Investigation ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
X Ray ◽  
Iron Phosphate Glasses ◽  
X Ray Absorption

An X-ray absorption spectroscopy study of the local environment of iron in degradable iron–phosphate glasses

2008 ◽  
Vol 354 (52-54) ◽  
pp. 5542-5546 ◽  
Author(s):  
Dong Qiu ◽  
Robert M. Moss ◽  
Dave M. Pickup ◽  
Ifty Ahmed ◽  
Jonathan C. Knowles ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Local Environment ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Spectroscopy Study ◽  
X Ray ◽  
Iron Phosphate Glasses ◽  
X Ray Absorption

Oxygen and phosphorus coordination around iron in crystalline ferric ferrous pyrophosphate and iron-phosphate glasses with UO2 or Na2O

1999 ◽  
Vol 14 (6) ◽  
pp. 2628-2639 ◽  
Author(s):  
C. H. Booth ◽  
P. G. Allen ◽  
J. J. Bucher ◽  
N. M. Edelstein ◽  
D. K. Shuh ◽  
...  
Keyword(s):  
Fine Structure ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Base Glass ◽  
Related Material ◽  
X Ray ◽  
Absorption Fine ◽  
Iron Substitution ◽  
Iron Phosphate Glasses ◽  
X Ray Absorption

Fe K-edge x-ray absorption fine-structure (XAFS) measurements were performed on glass samples of (Fe3O4)0.3(P2O5)0.7 with various amounts of Na2O or UO2. Near-edge and extended XAFS regions are studied and comparisons are made to several reference compounds. We find that iron in the base glass is ∼25% divalent and that the Fe2+ coordination is predominantly octahedral, while Fe3+ sites are roughly split between tetrahedral and octahedral coordinations. Also, we measure roughly one Fe–O–P link per iron. Substitution of Na2O or UO2 up to 15 mol% primarily affects the first Fe–O shell. The results are compared to data from the related material Fe3(P2O7)2.

Xanes (X-ray absorption near edge structure) of V in vanadium-iron phosphate glasses

1982 ◽  
Vol 42 (8) ◽  
pp. 547-551 ◽  
Author(s):  
A. Bianconi ◽  
A. Giovannelli ◽  
I. Dovoli ◽  
S. Stizza ◽  
L. Palladino ◽  
...  
Keyword(s):  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Edge Structure ◽  
X Ray ◽  
Vanadium Iron ◽  
Iron Phosphate Glasses ◽  
X Ray Absorption

Local environment of iron and uranium ions in vitrified iron phosphate glasses studied by Fe K and U LIII-edge x-ray absorption fine structure spectroscopy

2000 ◽  
Vol 15 (9) ◽  
pp. 1972-1984 ◽  
Author(s):  
M. Karabulut ◽  
G. K. Marasinghe ◽  
C. S. Ray ◽  
D. E. Day ◽  
G. D. Waddill ◽  
...  
Keyword(s):  
Fine Structure ◽  
Average Distance ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Edge Structure ◽  
X Ray ◽  
Absorption Fine ◽  
Uranium Ions ◽  
Iron Phosphate Glasses ◽  
X Ray Absorption

The local structure of iron and uranium ions in a series of iron phosphate glasses with the general composition (40 – x)Fe2O3–xUO2–60P2O5 and (1–x–y)(40Fe2O3–60P2O5)– xUO2–y(Na2O or CaO) was investigated using Fe K-edge and U LIII-edge x-ray absorption fine structure spectroscopy. Replacing Fe2O3 by UO2 in the glass caused more distortion in the coordination environment of Fe(III) ions. Extended x-ray absorption fine structure fits revealed that the Fe–P bonds observed in the base glass also existed in all the waste-loaded glasses. X-ray absorption near-edge structure showed that the uranium ions were predominantly present as U(IV) in the glasses. Uranium ions were coordinated to approximately 8 ± 1 oxygen atoms and 2.5 ± 0.6 phosphorus atoms at an average distance of 2.47 ± 0.02 and 3.8 ± 0.02 Å, respectively. There were no Fe–U or U–Fe neighbors observed, indicating that uranium ions occupied voids in the glass away from the PO4 units. These conclusions were supported by Mössbauer, x-ray photoelectron, and Raman spectroscopic data.

The Fe–O coordination in iron phosphate glasses by x-ray diffraction with high energy photons

2003 ◽  
Vol 15 (36) ◽  
pp. 6143-6153 ◽  
Author(s):  
U Hoppe ◽  
M Karabulut ◽  
E Metwalli ◽  
R K Brow ◽  
P J v ri
Keyword(s):  
Iron Phosphate ◽  
High Energy ◽  
Phosphate Glasses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Phosphate Glasses

Ion Beam Irradiation Induced Structural Modifications in Iron Phosphate Glasses: A Model System for Understanding Radiation Damage in Nuclear Waste Glasses

2015 ◽  
Vol 1757 ◽  
Author(s):  
Amy S. Gandy ◽  
Martin C. Stennett ◽  
Clive Brigden ◽  
Neil C. Hyatt
Keyword(s):  
Ion Beam ◽  
Structural Response ◽  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Structural Modifications ◽  
Atomic Displacements ◽  
Iron Phosphate Glasses ◽  
X Ray Absorption

ABSTRACTFe K-edge X-ray absorption spectroscopy (XAS) was applied to study the structural response of iron phosphate glasses to atomic displacements arising from ion beam irradiation, as an analogue of α-recoil damage arising from actinide immobilization. Analysis of XAS spectra demonstrated reduction of Fe3+ to Fe2+ as a consequence of 2 MeV Kr+ and 2 MeV Au+ implantation to a fluence of 2 x 1016 ions / cm2 and 5 x 1015 ions / cm2, respectively.

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