SHS of pyrochlore-type ceramic matrices for immobilization of actinide-containing nuclear wastes

Mineral-like Y 2 (Ti 1– x Zr x ) 2 O 7 ceramic matrices for immobilization of actinide–Zr–RE-containing high-level nuclear wastes (HLW) were prepared by SHS method. In experiments, HLW were modeled by a mixture of CeO 2 , La 2 O 3 , ZrO 2 , MnO 2 , and Fe 2 O 3 powders. An increase in the HLW conten...

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Bibliographic Details
Published inInternational journal of self-propagating high-temperature synthesis Vol. 26; no. 1; pp. 54 - 59
Main Authors Barinova, T. V., Borovinskaya, I. P., Barinov, V. Yu, Kovalev, I. D., Shchukin, A. S.
Format Journal Article
LanguageEnglish
Published New York Allerton Press 2017
Springer Nature B.V
Subjects
Chemistry and Materials Science
Immobilization
Materials Science
Porosity
immobilization
nuclear wastes
pyrochlore
SHS
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Summary:Mineral-like Y 2 (Ti 1– x Zr x ) 2 O 7 ceramic matrices for immobilization of actinide–Zr–RE-containing high-level nuclear wastes (HLW) were prepared by SHS method. In experiments, HLW were modeled by a mixture of CeO 2 , La 2 O 3 , ZrO 2 , MnO 2 , and Fe 2 O 3 powders. An increase in the HLW content of green mixture decreased the amount of Y 2 (Ti 1– x Zr x ) 2 O 7 in combustion product and increased that of ZrO 2 , LaTiO 3 , and CaTiO 3 ; decreased the fractional substitutionality of Zr for Ti; and increased the product porosity. An increase in combustion temperature and suppression of heat sink during SHS reaction did not diminish markedly the porosity of synthesized ceramics.
ISSN:1061-3862
1934-788X
DOI:10.3103/S1061386217010046