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.

Radiation-Induced Nanostructures in an Iron Phosphate Glass

2003 ◽  
Vol 792 ◽  
Author(s):  
K. Sun ◽  
T. Ding ◽  
L.M. Wang ◽  
R.C. Ewing
Keyword(s):  
Phosphate Glass ◽  
Ion Irradiation ◽  
Ion Beam ◽  
Dose Range ◽  
Iron Phosphate ◽  
High Energy ◽  
High Dose ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Feo Nanoparticles

ABSTRACTElectron and ion irradiation-induced nanostructures in an iron phosphate glass with a composition of 45 mol%Fe2O3-55 mol%P2O5 have been characterized by advanced electron microbeam techniques. Analysis by energy-filtered transmission electron microscopy indicated that Fe-rich and P-rich nanophases were formed when the glass was irradiated under a broad (with a diameter of 1.2μm) electron beam [give the dose range]. Phase separation developed with the increase in electron dose (from 1.0×1026e/m2 to 4.8×1026e/m2) as a result of the formation of an Fe-rich phase and pure P-phase. The formation of the Fe-rich and the P-phases are thought to be due to mainly ionization process. Under a low energy ion beam irradiation, Fe/FeO nanoparticles were formed, as confirmed by selected-area electron diffraction analysis. However, no nanoparticles were observed under a high-energy high-dose ion irradiation. The ion beam-irradiation results suggest that the formation of the Fe/FeO nanoparticles was due to preferential sputtering during ion irradiation and that the nanoparticles lie within the surface layers of the glass.

scholarly journals Microstructural and plasmonic modifications in Ag–TiO2 and Au–TiO2 nanocomposites through ion beam irradiation

2014 ◽  
Vol 5 ◽  
pp. 1419-1431 ◽  
Author(s):  
Venkata Sai Kiran Chakravadhanula ◽  
Yogendra Kumar Mishra ◽  
Venkata Girish Kotnur ◽  
Devesh Kumar Avasthi ◽  
Thomas Strunskus ◽  
...  
Keyword(s):  
Thin Films ◽  
Ion Beam ◽  
Nanocomposite Films ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Structural Modifications ◽  
Transmission Electron ◽  
Nanocomposite Thin Films ◽  
Before And After ◽  
Metal Volume

The development of new fabrication techniques of plasmonic nanocomposites with specific properties is an ongoing issue in the plasmonic and nanophotonics community. In this paper we report detailed investigations on the modifications of the microstructural and plasmonic properties of metal–titania nanocomposite films induced by swift heavy ions. Au–TiO2 and Ag–TiO2 nanocomposite thin films with varying metal volume fractions were deposited by co-sputtering and were subsequently irradiated by 100 MeV Ag8+ ions at various ion fluences. The morphology of these nanocomposite thin films before and after ion beam irradiation has been investigated in detail by transmission electron microscopy studies, which showed interesting changes in the titania matrix. Additionally, interesting modifications in the plasmonic absorption behavior for both Au–TiO2 and Ag–TiO2 nanocomposites were observed, which have been discussed in terms of ion beam induced growth of nanoparticles and structural modifications in the titania matrix.

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

Characterization of ion-beam mixed multilayers via grazing x-ray reflectometry

1988 ◽  
Vol 3 (6) ◽  
pp. 1089-1096 ◽  
Author(s):  
M. G. Le Boité ◽  
A. Traverse ◽  
L. Névot ◽  
B. Pardo ◽  
J. Corno
Keyword(s):  
Ion Beam ◽  
High Sensitivity ◽  
Metallic Multilayers ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Ion Beam Mixing ◽  
Compound A ◽  
X Ray ◽  
Atomic Displacements

The grazing x-ray reflectrometry technique was used as a way to study modifications in metallic multilayers induced by ion-beam irradiation. Due to the high sensitivity of the technique, short-range atomic displacements of an atom A in a layer B can be detected so that the first stages of ion-beam mixing can be investigated. The rate of mixing is measured and the compound A1−xBx formed at the layers' interfaces is characterized.

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.

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