Structural features of iron phosphate glasses

1997 ◽  
Vol 222 (1-2) ◽  
pp. 144-152 ◽  
Author(s):  
G Marasinghe
Keyword(s):  
Iron Phosphate ◽  
Structural Features ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

Structural features of hafnium iron phosphate glasses

2009 ◽  
Vol 355 (31-33) ◽  
pp. 1571-1573 ◽  
Author(s):  
M. Karabulut ◽  
M. Yuksek ◽  
G.K. Marasinghe ◽  
D.E. Day
Keyword(s):  
Iron Phosphate ◽  
Structural Features ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

Structural features of lead iron phosphate glasses

2002 ◽  
Vol 304 (1-3) ◽  
pp. 188-194 ◽  
Author(s):  
S.T. Reis ◽  
D.L.A. Faria ◽  
J.R. Martinelli ◽  
W.M. Pontuschka ◽  
D.E. Day ◽  
...  
Keyword(s):  
Iron Phosphate ◽  
Structural Features ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

The Effects of Uranium on the Structure of Iron Phosphate Glasses

1999 ◽  
Vol 556 ◽  
Author(s):  
Yaspal Badyal ◽  
Mevlut Karabulut ◽  
Kanishka Marasinghe ◽  
Marie-Louise Saboungi ◽  
Dean Haeffner ◽  
...  
Keyword(s):  
Glass Structure ◽  
Iron Phosphate ◽  
High Energy ◽  
Structural Features ◽  
Real Space ◽  
Phosphate Glasses ◽  
Base Glass ◽  
Pair Correlations ◽  
X Ray ◽  
Iron Phosphate Glasses

AbstractBecause of their high chemical durability and waste loading capacity, iron phosphate glasses are a natural candidate for a nuclear waste disposal medium. We have studied the effects of uranium on the structure of iron phosphate glasses with both neutron and high-energy x-raydiffraction. The results of neutron scattering, which is mostly sensitive to pair correlations involving light atoms i.e. O-O, Fe-O and P-O, indicate the main structural features of the base glass are largely unaffected by the addition of UO2. The nearest-neighborbour P-O, Fe-O and O- O peaks remain at the same position in real space and their intensities scale approximately with concentration. These findings are consistent with earlier results using Raman scattering and EXAFS on the Fe-K edge, where in both cases the spectra remain similar to the base glass. The results of high-energy x-ray scattering, which is sensitive to correlations involving the heavier atoms and thus complements the neutron measurements, are also consistent with the overall picture of uranium occupying interstitial sites in the relatively undisturbed base glass structure. Combining the neutron and x-ray data for a 10 mol% UO2 glass suggests the intriguing possibility of a U6+ uranyl ion configuration although further work is needed to establish the precise local structure and valence state of uranium in these glasses.

Structural features of iron phosphate glasses

1997 ◽  
Vol 222 ◽  
pp. 144-152 ◽  
Author(s):  
G.K. Marasinghe ◽  
M. Karabulut ◽  
C.S. Ray ◽  
D.E. Day ◽  
M.G. Shumsky ◽  
...  
Keyword(s):  
Iron Phosphate ◽  
Structural Features ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

Dielectric properties and structural features of barium-iron phosphate glasses

2004 ◽  
Vol 336 (3) ◽  
pp. 159-164 ◽  
Author(s):  
P Bergo ◽  
S.T Reis ◽  
W.M Pontuschka ◽  
J.M Prison ◽  
C.C Motta
Keyword(s):  
Dielectric Properties ◽  
Iron Phosphate ◽  
Structural Features ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

Speciation of sulphate ions in sodium alumino(iron)phosphate glasses

2019 ◽  
Vol 512 ◽  
pp. 81-89 ◽  
Author(s):  
S.V. Stefanovsky ◽  
O.I. Stefanovsky ◽  
I.L. Prusakov ◽  
M.I. Kadyko ◽  
A.A. Averin ◽  
...  
Keyword(s):  
Iron Phosphate ◽  
Phosphate Glasses ◽  
Iron Phosphate Glasses

The Effect of Electron Irradiation on the Structure of Sodium Aluminum-Iron Phosphate Glasses

MRS Advances ◽  
2016 ◽  
Vol 1 (63-64) ◽  
pp. 4227-4232 ◽  
Author(s):  
S.V. Stefanovsky ◽  
O.I. Stefanovsky ◽  
M.I Kadyko ◽  
V.A. Zhachkin ◽  
L.D. Bogomolova
Keyword(s):  
Room Temperature ◽  
Structural Evolution ◽  
Iron Phosphate ◽  
Esr Spectra ◽  
Phosphate Glasses ◽  
Water Molecules ◽  
Oxygen Hole ◽  
Bending Modes ◽  
Iron Phosphate Glasses ◽  
Hole Centers

ABSTRACTGlasses of the series (mol.%) 40 Na2O, (20-x) Al2O3, x Fe2O3, 40 P2O5 were irradiated with 8 MeV electrons to doses equivalent of 0.1, 0.5, and 1.0 MGy and characterized by FTIR spectroscopy and ESR at room temperature. FTIR spectra of all the glasses consist of strong bands due to O-P-O stretching modes in (PO4)3- and (P2O7)4- units at 1000-1200 cm-1, P-O-P stretching modes at 900-950 cm-1 (νas) and 700-750 cm-1 (νs), and bending modes in the PO4 units. The wavenumber range lower 800 cm-1 has some contribution due to stretching modes in MO4 and MO6 (M = Al, Fe) units. Moreover the bands at 3300-3700 cm-1 and 1550-1650 cm-1 due to stretching and bending modes in both absorbed and structurally bound H2O molecules were present. As irradiation dose increases the bands due to stretching and bending modes in water molecules and M-O-H bonds become stronger and are split. No essential changes with increasing dose were observed within the spectral range of stretching modes of the O-P-O and P-O-P bonds. Irradiation yields phosphorus-oxygen hole centers - PO42- (D5) and PO42- (D6), and PO32- ion-radicals (D2) observable in ESR spectra of low-Fe glasses. At x>5 their responses are overlapped with strong broad line due to Fe(III). On the whole, with the increase in iron content the glass structural evolution decrease.

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