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

Published online by Cambridge University Press:  20 February 2017

S.V. Stefanovsky ,
O.I. Stefanovsky ,
M.I Kadyko ,
V.A. Zhachkin  and
L.D. Bogomolova
S.V. Stefanovsky*
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences
O.I. Stefanovsky
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences
M.I Kadyko
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences
V.A. Zhachkin
Affiliation:
Moscow State Regional University
L.D. Bogomolova
Affiliation:
Research Institute of Nuclear Physics, Lomonosov Moscow State University
*
*(Email: serge.stefanovsky@yandex.com)
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Abstract

Glasses 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.

Keywords

radiation effectwaste managementinfrared spectroscopy
Type
Articles
Information
MRS Advances , Volume 1 , Issue 63-64: Scientific Basis for Nuclear Waste Management XXXIX , 2016 , pp. 4227 - 4232
Copyright
Copyright © Materials Research Society 2017 

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