Oxidation state and local environment of iron and hydrolytic stability of multicomponent aluminum-iron-phosphate glasses for immobilization of high-level waste
- Авторлар: Glazkova Y.S.1, Kalmykov S.N.1,2, Presnyakov I.A.1, Sobolev A.V.1, Stefanovskaya O.I.1, Stefanovsky S.V.3, Remizov M.B.4, Kozlov P.V.4, Makarovsky R.A.4
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Мекемелер:
- Moscow State University
- Vernadsky Institute of Geochemistry and Analytical Chemistry
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Mayak Production Association
- Шығарылым: Том 7, № 3 (2016)
- Беттер: 444-452
- Бөлім: New Methods of Treatment and Production of Materials with Required Properties
- URL: https://journals.rcsi.science/2075-1133/article/view/205137
- DOI: https://doi.org/10.1134/S2075113316030072
- ID: 205137
Дәйексөз келтіру
Аннотация
The nuclear gamma resonance (Mössbauer effect) is used to determine the oxidation state and the coordination environment of iron ions in model glasses that simulate vitrified high-level waste. A major fraction of iron is present in the samples with relatively low contents of transition metal oxides as Fe(III) in the octahedral oxygen environment. When the content of transition metal oxides is high, iron is distributed between a glassy phase (10–15%) and a crystalline phase (85–90%). Iron in the first phase exists predominantly as Fe(III) in the octahedral environment, while in the second phase it is present as Fe(II) and Fe(III) ions as well in a form of octahedrally coordinated and participating ions in a “fast” electron exchange proceeding as mFe3+ + nFe2+ ↔ mFe2+ + nFe3+. The leach rate of Cs ions from boron-free glasses amounts to ~1 × 10–5 g/(cm2 day) and lower, and the value for Fe is three orders of magnitude lower. Upon annealing, both the rate and the degree of leaching increase by several times, while the boron-containing glasses exhibit lower hydrolytic durability. Both the rate and the degree of leaching of iron change insignificantly after annealing.
Авторлар туралы
Ya. Glazkova
Moscow State University
Email: serge.stefanovsky@yandex.ru
Ресей, Moscow, 119991
S. Kalmykov
Moscow State University; Vernadsky Institute of Geochemistry and Analytical Chemistry
Email: serge.stefanovsky@yandex.ru
Ресей, Moscow, 119991; ul. Kosygina 19, Moscow, 119071
I. Presnyakov
Moscow State University
Email: serge.stefanovsky@yandex.ru
Ресей, Moscow, 119991
A. Sobolev
Moscow State University
Email: serge.stefanovsky@yandex.ru
Ресей, Moscow, 119991
O. Stefanovskaya
Moscow State University
Email: serge.stefanovsky@yandex.ru
Ресей, Moscow, 119991
S. Stefanovsky
Frumkin Institute of Physical Chemistry and Electrochemistry
Хат алмасуға жауапты Автор.
Email: serge.stefanovsky@yandex.ru
Ресей, Leninskii pr. 31, Moscow, 199071
M. Remizov
Mayak Production Association
Email: serge.stefanovsky@yandex.ru
Ресей, Ozersk, 456780
P. Kozlov
Mayak Production Association
Email: serge.stefanovsky@yandex.ru
Ресей, Ozersk, 456780
R. Makarovsky
Mayak Production Association
Email: serge.stefanovsky@yandex.ru
Ресей, Ozersk, 456780
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