Influence of the heat treatment procedure and irradiation on the structure of the anionic motif and crystallization of uranium-containing phosphate glasses
- Authors: Stefanovsky S.V.1, Stefanovskaya O.I.1, Kadyko M.I.1, Nikonov B.S.2, Myasoedov B.F.1
-
Affiliations:
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry
- Issue: Vol 58, No 6 (2016)
- Pages: 654-661
- Section: Article
- URL: https://journals.rcsi.science/1066-3622/article/view/223676
- DOI: https://doi.org/10.1134/S106636221606014X
- ID: 223676
Cite item
Abstract
The solubility of UO3 in sodium almino(ferro)phosphate (SAFP) glasses prepared by quenching of melts reaches almost 50 wt %. The structure of the anionic motif of the network of such glasses is formed by polyanions and consists of alumino(ferro)phosphate and uranium–oxygen constituents. Irradiation with electrons of up to 8 MeV energy to an absorbed dose of 106 Gy does not lead to appreciable changes in the glass structure, except insignificant increase in the fraction of octahedrally coordinated aluminum. After annealing, samples of sodium aluminophosphate glasses with low content of uranium oxides (up to 10 wt %) partially crystallize with the formation of phosphotridymite, whereas high-uranium glasses (up to ~50 wt % UO3) remain X-ray amorphous. Samples of SAFP glasses at low concentrations of uranium oxides remain amorphous and at high concentrations undergo phase segregation with the formation of a SAFP glass phase enriched in uranium oxides and crystalline phase of sodium aluminum iron orthophosphate Na3(Al,Fe)2(PO4)3 containing impurity amounts of uranium ions. The incorporation of uranium ions is most probably due to the occurrence of redox processes between uranyl and iron ions.
About the authors
S. V. Stefanovsky
Frumkin Institute of Physical Chemistry and Electrochemistry
Author for correspondence.
Email: serge.stefanovsky@yandex.ru
Russian Federation, Leninskii pr. 31, korp. 4, Moscow, 119071
O. I. Stefanovskaya
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: serge.stefanovsky@yandex.ru
Russian Federation, Leninskii pr. 31, korp. 4, Moscow, 119071
M. I. Kadyko
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: serge.stefanovsky@yandex.ru
Russian Federation, Leninskii pr. 31, korp. 4, Moscow, 119071
B. S. Nikonov
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry
Email: serge.stefanovsky@yandex.ru
Russian Federation, Staromonetnyi per. 35, Moscow, 119017
B. F. Myasoedov
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: serge.stefanovsky@yandex.ru
Russian Federation, Leninskii pr. 31, korp. 4, Moscow, 119071