Oxidation state and local environment of iron and hydrolytic stability of multicomponent aluminum-iron-phosphate glasses for immobilization of high-level waste


Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

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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